Journal articles: 'O. niloticus'

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SCORDELLA, G., F. LUMARE, A. CONIDES, and C. PAPACONSTANTINOU. "First Occurrence Of The Tilapia Oreochromis Niloticus Niloticus (Linnaeus, 1758) In Lesina Lagoon (Eastern Italian Coast)." Mediterranean Marine Science 4, no. 1 (June 1, 2003): 41. http://dx.doi.org/10.12681/mms.239.

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Individuals of the tilapia species Oreochromis niloticus niloticus(Linnaeus, 1758) were caught in Lesina Lagoon during experimental sampling for the shrimp Penaeus kerathurus using fyke net traps from December 1999 to September 2000. The species O. niloticusis not native in Italian coastal waters, although attempts of tilapia culture in land-based aquaculture farms were occasionally carried out in the past. The number of individuals captured in the samples suggests a colonization of the area of Lesina lagoon. The highest catches were observed during July. In July, the individuals caught represented the 22.3±4.1 % of the total catch weight. Such colonization of a marine environment byO. niloticusniloticus is the first case reported for Italy. The occurrence of the species in Lesina lagoon is attributed to fish which escaped from fish farms in the area and entered the lagoon through the numerous streams and irrigation-drainage channels that outflow along the south coastline.

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Peterka, Miroslav, Jean Yves Sire, Maria Hovorakova, Jan Prochazka, Luc Fougeirol, Renata Peterkova, and Laurent Viriot. "Prenatal development of Crocodylus niloticus niloticus Laurenti, 1768." Journal of Experimental Zoology Part B: Molecular and Developmental Evolution 314B, no. 5 (January 13, 2010): 353–68. http://dx.doi.org/10.1002/jez.b.21335.

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Ayo, Victoria Ifeoluwa, Dickson Achimugu Musa, and Evans Chidi Egwim. "Extraction and characterization of type 1 collagen from the skin and scales of Heterotis niloticus and Lates niloticus." AROC in Pharmaceutical and Biotechnology 1, no. 2 (September 14, 2021): 01–10. http://dx.doi.org/10.53858/arocpb01020110.

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The study is aimed to extract and characterize collagens from the skin and scale of two selected Nigerian freshwater fish species (Heterotis niloticus and Lates niloticus) using either pepsin (PSC) or acid-soluble (ASC) extraction. The collagen was extracted using 0.5M acetic acid and pepsin. The collagen yield was determined and characterized by SDS PAGE, and FTIR. Collagen extraction yields varied with the extraction process; the yield was significantly higher in the skin (5.08±0.34–33.97±1.78 %) than in the scale (1.76–8.05 %). The absorption peaks of the extracted collagen using acetic acid and pepsin show that only ASC of skin (3344.27 cm-1) and scale (3495.85 cm-1) of H. niloticus shows the peaks characteristic of Amide A, while Amide B peaks of collagen extracted from the skin and scale of H. niloticus and L. niloticus were found at 2974.46 cm-1 and 2925.7 cm-1 , representing an asymmetrical stretch of CH2. Similarly, ASC on the skin (1558.36 cm-1) and scale (1576.46 cm-1) of H. niloticus shows the absorption peak characteristics of amide II. ASC on the skin of H. niloticus (1671.05 cm-1), PSC on scale of H. niloticus (1658.55 cm-1), and on scale of H. niloticus (1678.65 cm1) shows absorption peaks in range characteristic of amide 1. There were no differences in the skin and scale collagen profiles among the two fish species when characterized by SDS-PAGE. Our data revealed that the skin and scale of Lates niloticus and Heterotis niloticus could be a good alternative source of high-quality collagen for industries.

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Amon, Nicolas Yao, Sylvain Kouassi Konan, Dongo Koffi Kouassi, and Kouakou Yao. "Performances zootechniques des mâles de Oreochromis niloticus (Linné, 1758), Sarotherodon melanotheron (Rüppell, 1853) et leurs hybrides en phase de grossissement en cages installées en étang." International Journal of Biological and Chemical Sciences 14, no. 5 (September 14, 2020): 1611–17. http://dx.doi.org/10.4314/ijbcs.v14i5.10.

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En Côte d’Ivoire, l’élevage en milieu lagunaire a du mal à prendre son envol du fait du manque de poisson intéressant au plan zootechnique. En vue de rechercher une bonne espèce à potentialité piscicole, deux souches pures de tilapia (Oreochromis niloticus et Sarotherodon melanotheron) et leurs hybrides (♀ S. melanotheron x ♂ O. niloticus et ♀ O. niloticus x ♂ S. melanotheron) ont été étudiées en phase de grossissement en cages. Ainsi, deux cent quarante (240) poissons issus d’un prégrossissement en bacs en béton avec des poids moyens initiaux compris entre 33,60 ± 2,11g et 70,25 ± 2,20g ont été repartis en 8 lots à raison de deux lots par type de croisement. Ces poissons ont été suivis pendant six (6) mois durant lesquels ils ont reçu quotidiennement un aliment titrant 30% de protéines. Les résultats relatifs aux performances de croissance ont révélé que les hybrides issus du croisement ♀ O. niloticus x ♂ S. melanotheron ont une croissance (0,70 ± 0,02g/j) supérieure à celles des hybrides de ♀ S. melanotheron x ♂ O. niloticus (0,45 ± 0,01g/j) et de S. melanotheron (0,37 ± 0,03 g/j). La croissance de O. niloticus a été la meilleure (1,22 ± 0,01g/j). Quant à la survie, les hybrides et leurs parents S. melanotheron ont enregistré un taux supérieur à celui de O. niloticus (100% contre 83,33%). Ces résultats suggèrent que les hybrides ont une adaptabilité aux milieux lagunaires comparable à celle de S. melanotheron. L’ hybride issus du croisement ♀ O. niloticus x ♂ S. melanotheron qui a mieux hérité de la résistance au milieu lagunaire de S. melanotheron ainsi que de la bonne croissance de O. niloticus, se présente comme le meilleur choix pour une pisciculture lagunaire à grande échelle.Mots clés : Tilapias, Croissance, survie, lagune. English Title: Zootechnical performances of males of Oreochromis niloticus (Linné, 1758), Sarotherodon melanotheron (Rüppell, 1853) and their hybrids in growth phase in cages installed in pondIn Ivory Coast, the breeding in lagoon environment has difficulty to take off because of the lack of interesting fish at the zootechnical level. In order to identify a potential candidate species for fish farming in brackish water, two pure strains of tilapia (Oreochromis niloticus and Sarotherodon melanotheron) and their hybrids (♀ S. melanotheron x ♂ O. niloticus and ♀ O. niloticus x ♂ S. melanotheron) were studied in the growth phase in cages. Thus, two hundred and forty (240) fish from a pregrowth in concrete tanks with initial average weights between 33.60 ± 2.11g and 70.25 ± 2.20g were divided into 8 lots at the rate of two lots by type of crossing. These fish were followed for six (6) months during which they received daily food containing 30% protein. The results relating to the growth performances revealed that the hybrids resulting from the crossing ♀ O. niloticus x ♂ S. melanotheron have a growth (0.70 ± 0.02 g/d) higher than those of the hybrids of ♀ S. melanotheron x ♂ O. niloticus (0.45 ± 0.01 g/d) and S. melanotheron (0.37 ± 0.03 g/d). The growth of O. niloticus was the best (1.22 ± 0.01 g/d). As for survival, the hybrids and their parents S. melanotheron recorded a higher rate than that of O. niloticus (100% against 83.33%). These results suggest that the hybrids have good adaptability to the lagoon environment like S. melanotheron. The hybrid from the cross ♀ O. niloticus x ♂ S. melanotheron, which has better inherited the resistance to the lagoon environment of S. melanotheron as well as the good growth of O. niloticus, is the best choice for lagoon fish farming. in large scale.Keywords: Tilapias, growth, survival, lagoon.

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Mitra, Amlan Kumar, and Probir Bandyopadhyay. "First record of ectoparasitic African Trichodinids (Ciliophora: Peritrichida) in a cichlid fish Oreochromis mossambicus (Peters 1852) from the Churni river system, West Bengal, India." Animal Biology 56, no. 3 (2006): 323–33. http://dx.doi.org/10.1163/157075606778441912.

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AbstractOreochromis mossambicus (Peters 1852) and Oreochromis niloticus niloticus Linnaeus, 1758 are two popular freshwater fishes introduced from Africa to India. There are many records of different species of trichodinid ectoparasites infesting wild and cultured cichlids in Africa, but no such study has been conducted on this parasitic group in India. The fishes Oreochromis mossambicus and Oreochromis niloticus niloticus were investigated for the occurrence of trichodinid ciliophorans. Oreochromis mossambicus was found positive for two species, viz., Trichodina centrostrigeata Basson, Van As & Paperna, 1983 and Paratrichodina africana Kazubski & El-Tantawy, 1986. Oreochromis niloticus niloticus was found not to be infested with any species of trichodinid ciliophorans, although, interestingly, Paratrichodina africana was first discovered in this host fish. Comparative descriptions and prevalence of these two above-mentioned species are presented.

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Susilo, Yunus. "Efek Teknologi Lucutan Plasma Pada Organoleptik Daging Ikan Nila (Oreochromis niloticus)." Jurnal Biosains Pascasarjana 23, no. 1 (June 10, 2021): 16. http://dx.doi.org/10.20473/jbp.v23i1.2021.16-27.

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AbstrakPenelitian ini bertujuan untuk mengetahui efektivitas ozon dalam menghambat kerusakan pada ikan nila (Oreochromis niloticus). Penelitian ini dilakukan dengan memberikan pemaparan ozon pada ikan nila (Oreochromis niloticus) dengan teknik pemaparan ozon melalui air dengan variasi waktu alir, yaitu 0 detik, 540 detik, 360 detik, dan 180 detik. Sampel ikan nila (Oreochromis niloticus) diperoleh dari tempat budidaya ikan nila di Tanggulangin, Kota Sidoarjo. Penelitian ini dilakukan dengan teknik Rancangan Acak Lengkap (RAL). Pengamatan dilakukan setiap 12 jam sekali selama 48 jam atau 2 hari berupa pengujian organoleptik pada ikan nila (Oreochromis niloticus). Hasil uji organoleptik menunjukkan bahwa teknik paparan ozon melalui air dengan waktu alir 3 menit dalam waktu penyimpanannya selama 12 jam dengan konsentrasi ozon 0,0203 mg/L memberikan hasil yang terbaik dalam menghambat kerusakan mutu kualitas ikan nila (Oreochromis niloticus) yang ditandai dengan perubahan pada mata, insang, lendir permukaan badan, daging, bau, dan tekstur ikan nila (Oreochromis niloticus) serta spesifikasi pada ikan yang paling efektif dalam menghambat kerusakan adalah pada penampakan lendir permukaan badan dan bau pada ikan nila (Oreochromis niloticus).

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Amuneke, K. E., O. R. Oguntade, F. C. Ikeogu, and U. A. Nomeh. "Effect of natural preservatives on the organoleptic characteristics and storage stability of smoked Heterotis niloticus." Agro-Science 19, no. 2 (April 22, 2020): 31–35. http://dx.doi.org/10.4314/as.v19i2.5.

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Improvement of consumer’s palatability of Heterotis niloticus was investigated by value addition with natural spices and salt to improve its palatability and shelf-life. The major problem of H. niloticus is its poor taste, hence low demand and poor consumer’s acceptability which affects the market value. The objective of this study was to improve the palatability and shelf-life of H. niloticus using selected natural spices. Heterotis niloticus, procured and treated with natural spices and salt were allowed to drain for one hour, subjected to charcoal fired smoking kiln for 12 hours, cooled and stored for 8 weeks at ambient temperature before microbial analysis. The result showed that treatment 1 had the best quality (37.7%), followed by control sample (34.7%), and treatment 2 (28.9%), while the least was treatment 3 (21.6%). Microbial analysis shows that no Salmonella, Coliforms and E. coli were detected from the samples after smoking. Staphylococcus aureus count ranged from 2 × 102 to 9 × 102 but it was not detected in treatment 1. Improvement of the consumers’ palatability of H. niloticus and improved storage stability by spicing methods improved the poor taste of H. niloticus which has been discriminated despites excellent muscle quality. Key words: Heterotis niloticus, organoleptic, spicing, microbial analysis

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Khairani, Shafia, Faisal Fikri, Agus Purnomo, and Muhammad Thohawi Elziyad Purnama. "A Comparative Histological Study of Skin in Clarias gariepinus and Oreochromis niloticus." Media Kedokteran Hewan 32, no. 2 (May 22, 2021): 90. http://dx.doi.org/10.20473/mkh.v32i2.2021.90-96.

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This study aimed to evaluate the comparative of histological figures in Clarias gariepinus and Oreochromis niloticus skin. A total of 18 samples were observed and collected the skin preservation. The hematoxylin-eosin staining performed to determine the histological structure. Results showed that there were different structures in the epidermis and dermis layer between C. gariepinus and O. niloticus skin. Club cells showed dominated in the epidermis layer of C. gariepinus. The pigmented cell showed clearly in the basement layer of C. gariepinus compared to O. niloticus. Stratum compactum in O. niloticus also showed adequate compared to C. gariepinus.

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SHERIF, A. H., E. T. ALSOKARY, and H. A. ESAM. "Assessment of titanium dioxide nanoparticle as treatment of Aeromonas hydrophila infection in Oreochromis niloticus." Journal of the Hellenic Veterinary Medical Society 70, no. 3 (October 30, 2019): 1697. http://dx.doi.org/10.12681/jhvms.21796.

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Nanoproducts became widely used materials all over the world. Antimicrobial properties of titanium dioxide (TiO2) nanoparticle (NP) were examined against Aeromonas hydrophila (A. hydrophila) bacteria and the minimum inhibitory concentration (MIC) was found to be 20 μg/ml of TiO2NP. In addition, the treatment efficacy of TiO2NP was examined in Oreochromis niloticus (O. niloticus) infected with A. hydrophila. One hundred and eighty fish (54±2.4 g b.w.) were divided into six groups (G). O. niloticus in G1, G2 and G3 were fed for 30 days with 0, 20 and 100 μg/g b.w. TiO2NP, respectively, while G4, G5 and G6 were i.p. injected with 0.2 ml distal water, 20 and 100 μg/g b.w. TiO2NP, respectively, for three times with ten days of interval. The blood parameters as well as some of the biochemical parameters of O. niloticus that received high dosage of TiO2NP were significantly affected regardless to the administration route. Elevation of the activities of glutathione peroxidase (GPx) and metallothionine (MT) were recorded with the high dosage. Furthermore, O. niloticus subjected to high dosage of TiO2NP had the lower survival rate (SR%) especially with the injection route (50%). On the other hand, no significant changes were demonstrated with the perceived TiO2NP MIC. The mortality rate (MR%) of challenged O. niloticus against A. hydrophila was decreased in case of TiO2NP MIC exposure, as G2 and G5 revealed 20 and 30%, respectively. Therefore, the 20 μg/g b.w. of TiO2NP could safely protect O. niloticus against A. hydrophila infection since no health hazards was observed. Meanwhile, health status of O. niloticus was adversely affected with high dosage of TiO2NP irrespective to the route of administration.

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AMIN, Nour El-Din, I. S. ABDALLAH, T. ELALLAWY, and S. M. AHMED. "Motile Aeromonas septicaemia among Tilapia nilotica (Sarotherodon niloticus) in upper Egypt." Fish Pathology 20, no. 2/3 (1985): 93–97. http://dx.doi.org/10.3147/jsfp.20.93.

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EL-Shammaa, Mamdouh A., Hany A. El-Habback, Gehad, A. El-Bargeesy, and Shymaa H. Hussein. "HISTOLOGICAL STUDIES ON SOME IMMUNE ORGANS OF OREOCHROMIS NILOTICUS (TILAPIA NILOTICA." Kafrelsheikh Veterinary Medical Journal 6, no. 1 (April 1, 2008): 60–93. http://dx.doi.org/10.21608/kvmj.2008.115900.

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Mutie, Alice, Edna Waithaka, George Morara, Priscilla Boera, Job Mwamburi, James Last Keyombe, and Beatrice Obegi. "Population characteristics of Oreochromis niloticus (Linnaeus, 1758) in light of varying water quality conditions of adjoined Lakes Naivasha and Oloidien in Kenya." Pan Africa Science Journal 01, no. 01 (April 18, 2020): 54–71. http://dx.doi.org/10.47787/pasj.2020.02.20.

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Nile tilapia Oreochromis niloticus (L.) is a recent re-introduction in Lake Naivasha and is one of the fish species that has crossed into Lake Oloidien. This study assessed and compared the population characteristic of O. niloticus under different physicochemical conditions of water in L. Naivasha (main) and L. Oloidien. Samples of water for selected water quality parameters and fisheries data from catch survey were collected between 2017 and 2018. Results indicate the highest conductivity levels recorded in 2018 as 2916 ±11.30 µScm-1 and 282.33 ± 4.33 µScm-1 for L. Oloidien and L. Naivasha respectively. Mean total lengths of O. niloticus were 19.1± 1.8 cm and 23.6 ± 2.9 cm for L. Oloidien and L. Naivasha respectively. Mean weight of O. niloticus was 129.3 ± 37.8 g in L. Oloidien and 260.9 ± 81.0 g in L. Naivasha. Length-weight relationship analysis showed a negative allometric growth (b = 2.526) and (b = 2.983; p > 0.05) in lakes Oloidien and Naivasha respectively. The relative condition factor (Kn) values were slightly lower in O. niloticus from L. Oloidien compared to the main Lake. Differences between the two lakes in the population characteristics of O. niloticus may be attributed to the observed differences in the habitat conditions, including the conductivity and pH levels.

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Garcia-Santos, S., S. M. Monteiro, J. Carrola, and A. Fontainhas-Fernandes. "Alterações histológicas em brânquias de tilápia nilotica Oreochromis niloticus causadas pelo cádmio." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 59, no. 2 (April 2007): 376–81. http://dx.doi.org/10.1590/s0102-09352007000200017.

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Os efeitos histopatológicos do cádmio nas brânquias de tilápia Oreochromis niloticus foram estudados por microscopia óptica, usando 25mgl-1 de CdCl2 durante quatro dias, com o objetivo de identificar seus efeitos agudos na estrutura das brânquias. A morfologia geral das brânquias de O. niloticus é idêntica à de outros teleósteos, apresentando quatro pares de arcos branquiais com filamentos bem desenvolvidos. Situadas lateralmente, encontram-se as lamelas provenientes do eixo central dos filamentos. No epitélio filamentar foi possível identificar células de cloro, pavimentosas e mucosas. Os peixes expostos ao cádmio mostraram sinais de lesões epiteliais; edema intersticial, vasodilatação das lamelas, destacamento do epitélio lamelar e proliferação do epitélio filamentar. As alterações observadas também incluíram fusão nas lamelas como resultado de hiperplasia e hipertrofia epitelial, ruptura do sistema de células pilar, aneurismas e necroses.

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Odhiambo, Elija, Paul O. Angienda, Patrick Okoth, and David Onyango. "Stocking Density Induced Stress on Plasma Cortisol and Whole Blood Glucose Concentration in Nile Tilapia Fish (Oreochromis niloticus) of Lake Victoria, Kenya." International Journal of Zoology 2020 (July 17, 2020): 1–8. http://dx.doi.org/10.1155/2020/9395268.

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Effects of high stocking densities (HSDs) were evaluated for Nile tilapia fish (Oreochromis niloticus) under culture to determine its influence on plasma cortisol and whole blood glucose concentration. Plasma cortisol levels (ng/ml) were assayed by Enzyme-Linked Immunosorbent Assay (ELISA). Whole blood glucose levels were determined using a hand-held one touch ultraglucose meter (MD-300) and test strips. Plasma cortisol and whole blood glucose level determinations were replicated three times for O. niloticus reared under both low stocking densities (LSD) and HSD. One way Analysis of Variance (ANOVA) was performed on the data collected, and comparison of significant differences in means was carried out between LSD and HSD at 0.01%. Plasma cortisol levels revealed statistically (P≤0.01) significant values of HSD at 6.32 ± 1.06 ng/ml than in LSD at 4.62 ± 1.58 ng/ml for the O. niloticus groups studied. Whole blood glucose analysis revealed a statistical (P<0.05) difference in the means in HSD and LSD O. niloticus groups (F(df,1; 8) = 7.946 > Fcrit = 4.414; P=0.01). Mean plasma glucose concentration was statistically (P≤0.01) higher for HSD than LSD O. niloticus groups at mean ± SD, 96.84 ± 5.28 and 76.82 ± 5.92, respectively. The findings of this study demonstrate that high stocking densities increase both cortisol and whole blood glucose concentration in tilapia fish, indicating a marked increase in stress levels. Elevated plasma cortisol and whole blood glucose concentration can be used as biomarkers for acute stress in O. niloticus produced under aquaculture systems. The findings of this study can help inform policy on the management of stress caused by overstocking of O. niloticus and other related Cichlids under industrial aquaculture production.

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Gebreegziabher, Hailekiros, Hailu Degefu, and Assefa Kebede Tsegay. "Prevalence of Internal Helminth Parasites of Fish in Gilgel-Gibe River and Three Selected Ponds in and Around Jimma Town, South West Ethiopia." Turkish Journal of Fisheries and Aquatic Sciences 20, no. 9 (June 29, 2020): 693–99. http://dx.doi.org/10.4194/1303-2712-v20_9_04.

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In the current study, 308 Oreochromis niloticus and 76 Barbus species were subjected to standard postmortem and parasitological examinations. Of them, 30.9% of fish harbored at least one or more helminth parasites in their kidney, pericardial and brachial cavity. Parasite genera identified were Contracaecum (18.5%) Clinostomum (6.5%) and Euclinostomum (3.9%). The overall prevalence in O. niloticus was 38.6% but no parasite was identified in Barbus species. Despite higher prevalence was recorded in O. niloticus collected from Seka-Chekorsa pond (57.1%) and the least from Furustale ponds (30.9%), there was no statistical significance variation (P>0.05) among fishes collected from different ponds and Gilgel-Gibe River. Statistically significant differences were recorded among the different age groups of O. niloticus (χ2 = 12.1, Df= 3; P<0.05), with high prevalence in fingerlings (55.5%) and juvenile (53.1%) as compared to young (36.5%) and adult fish (29.4%). In conclusion, fish parasitism constitutes a huge health threat to O. niloticus. Lastly, the current study revealed that Barbus species showed some resistance for parasitic helminthes at least identified in this study. Therefore, detailed study in Barbus immunity against the mentioned helminthes and awareness creation on the overall fish management is recommended.

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Bazh, E. K. A., and A. H. Hamouda. "Scanning morphology, prevalence and histopathology of some acanthocephalans infecting some River Nile fish." BULGARIAN JOURNAL OF VETERINARY MEDICINE 24, no. 2 (2021): 239–50. http://dx.doi.org/10.15547/bjvm.2019-0087.

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Acanthocephalan morphology and their adverse pathological impact on fish are of great concern. Two species of acanthocephalans were recorded from 800 samples of live freshwater fish collected randomly during 2017–2018 from Lake Nasser, Aswan, Egypt. The recovered species were identified morphologically as Acanthogyrus (Acanthosentis) tilapiae from three Tilapia spp. (Sarotherodon galilaeus, Oreochromis niloticus and Tilapia zillii) and Rhadinorhynchus niloticus from Lates niloticus. The intensity of parasitic infection and the seasonal prevalence were higher in L. niloticus than in Tilapia spp. The clinical signs and post mortem lesions of infected fish were reported. Morphological description of the detected parasites using light microscope was then confirmed by electron microscopy to amplify ambiguous details. The histopathological findings of the intestine of naturally infected fish with acanthocephalan parasites were investigated and described. The main damage caused by them is destruction of the mucosal epithelium of the villi, necrosis and degeneration of intestinal epithelial cells.

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Gil Díaz, David, Gabycarmen Navarrete Rodríguez, María del Refugio Castañeda Chávez, Itzel Galaviz Villa, and Cinthya Alejandra Sosa Villalobos. "TOXICIDAD AGUDA DEL HERBICIDA PARAQUAT EN Oreochromis niloticus (CICHLIDAE) Y Macrobrachium olfersii (PALAEMONIDAE)." Acta Biológica Colombiana 26, no. 2 (January 14, 2021): 178–85. http://dx.doi.org/10.15446/abc.v26n2.84792.

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El Paraquat es un herbicida utilizado en la actividad agropecuaria para controlar hierbas, su modo de acción es por medio de contacto y no selectivo. Debido a su alta solubilidad en agua y baja volatilidad representa un riesgo potencial para organismos acuáticos, principalmente los que son cultivados con aguas superficiales que reciben impacto de la actividad agrícola. La tilapia Oreochromis niloticusy el langostino Macrobrachium olfersiison organismos de importancia comercial para la industria acuícola del estado de Veracruz, México.El objetivo de este estudio fue determinar la Concentración Letal Media (CL50) del herbicida Dasurquat® (ingrediente activo Paraquat) a través de un bioensayo de toxicidad aguda (96 horas). Se utilizaron como especímenes de prueba a juveniles de tilapia O. niloticus(peso promedio = 10 mg, longitud total= 8,75 mm) y otro el ensayo fue con poslarvas de langostino M. olfersii(peso promedio = 5 mg, longitud total= 5,72 mm). Se emplearon cinco concentraciones (5, 10, 20, 40 y 80 µl L-1para el bioensayo con juveniles de tilapia; para el bioensayo con poslarvas de langostino las concentraciones fueron 0,1, 0,2, 0,5, 0,7 y 1 µl L-1). El diseño experimental consideró un control negativo, con dos repeticiones y dos réplicas por cada tratamiento. El análisis de datos se realizó con el método Probit para determinar la CL50a 96 horas, se obtuvo un valor para juveniles de O. niloticusde 17,49 µl L-1con intervalo de confianza (95 %) con límite inferior de 13,75 µl L-1y límite superior 22,25 µl L-1, para las larvas de M. olfersiise obtuvo un valor de 0,31 µl L-1con intervalo de confianza (95 %) con límite inferior de 0,26 µl L-1y límite superior 0,35 µl L-1. El análisis de varianza demostró que no existió diferencia estadística significativa (p > 0.05) entre las réplicas de los tratamientos. Se concluye que es necesario continuar con estudios para evaluar su toxicidad en organismos acuáticos debido al amplio uso de este herbicida en la actividad agropecuaria, y determinar su riesgo para otras actividades productivas además de la acuicola.

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A, Omoike. "The Growth and Survival of Various Forms Androgen Sex - Reversal Oreochromis niloticus Cultured Using Hapas in Concrete Tank." Aquaculture & Fisheries 5, no. 1 (March 9, 2021): 1–5. http://dx.doi.org/10.24966/aaf-5523/100036.

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The production of same sex Oreochromics niloticus to enhance better and uniform growth for Tilapia culture has called for technological means using sex-reversal hormones Methyl Testosterone (MT), this study will look into the percentage growth and survival of Oreochromics niloticus fry.

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Kamruzzaman, Md Abdullah Al Mahamud, Abdul Alim, Md Shahadat Hossen, Md Ariful Islam, and Md Abul Mansur. "Study on heavy metal content of Oreochromis niloticus, Heteropneustes fossilis and Pangasius sutchi collected from pond and open water." Research in Agriculture Livestock and Fisheries 5, no. 1 (May 3, 2018): 117–26. http://dx.doi.org/10.3329/ralf.v5i1.36560.

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Present studies were conducted on the study of heavy metal content of three popular freshwater fish, tilapia Oreochromis niloticus, shing, Heteropneustes fossilis and pangus, Pangasius sutchi collected from pond and open water in Mymensingh. All samples were evaluated by studying unwanted heavy metal concentrations. Cadmium (Cd) concentration (μg/g) of pond water O. niloticus, H. fossilis and P. sutchi was found to be 0.21±0.02, 0.20±0.01 and 0.22±0.02 respectively and open water was 0.28±0.03, 0.25±0.02 and 0.29±0.03, respectively. Copper (Cu) concentration (μg/g) of pond water O. niloticus, H. fossilis and P. sutchi was 0.25±0.02, 0.29±0.03 and 0.21±0.02 respectively whereas open water had 0.28±0.01, 0.59±0.04 and 0.35±0.01 respectively. Lead (Pb) concentration (μg/g) of pond water O. niloticus and H. fossilis contained 0.07±0.01 and 0.08±0.01, respectively whereas the open water had 0.15±0.02 and 0.15±0.01, respectively. Pb concentration both in pond and in open water P. sutchi was nil. Pb concentration of O. niloticus was higher in open water fishes (0.15±0.02 μg/g) than the fishes of pond water (0.07±0.01 μg/g). Heavy metal concentration of O. niloticus, H. fossilis and P. sutchi was within permissible limits except Cd of open water fishes. The result revealed that open water fishes have higher concentration of heavy metals in their muscle than the fishes of pond water. The results indicate that the open water environment is polluted by various chemical composition as well as various toxic heavy metal pollutants.Res. Agric., Livest. Fish.5(1): 117-126, April 2018

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Singh, Atul K., Sharad C. Srivastava, and Pushpendra Verma. "MaxEnt distribution modeling for predicting Oreochromis niloticus invasion into the Ganga river system, India and conservation concern of native fish biodiversity." Aquatic Ecosystem Health & Management 24, no. 2 (April 1, 2021): 43–51. http://dx.doi.org/10.14321/aehm.024.02.08.

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Abstract In order to assess the distribution pattern and understand the prevailing factors for predicting further expansion of an exotic fish Oreochromis niloticus, this study was undertaken in the Ganga river flowing through the state of Uttar Pradesh using MaxEnt model. The authors report the distribution pattern of O. niloticus and prevailing causative factors mounting the expansion of O. niloticus in the Ganges based on MaxEnt modeling technique. The presence only occurrence data-set for this invasive species was prepared from the field data and also from data collated from the authenticated publications of different fisheries researchers. The data-set was analyzed with environmental and topographical variables typically incorporating seasonal and temporal variability using MaxEnt, a maximum entropy algorithm which showed that the area under curve was much closer to 1 ( 0.999). The model predicted elevation as the most influential predictor variable with permutation importance of 69.2% followed by slope_steepness (10.1%), Tmax_1 (7.3%) and Srad_5 (6.8%). The findings from the results suggest that invasive O. niloticus tend to spread in rivers where elevation is lower as well as slope_steepness of the river is higher and thus indicated that invasion might be higher in the downstream of the river. The model suggests that topography and its derived variable are the most significant predictors for distribution of invasive O. niloticus. The results of this study also confirm that the water qualities of the Ganga river are suitable for O. niloticus and if the model is supplemented with water quality variables data, the influential predictor variable in water quality can be well investigated with permutation importance.

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AMOO, Timothy O., and Olaniyi O. KOMOLAFE. "Length-Weight Relationships and Condition Factors of Several Nigerian Fish Species." Notulae Scientia Biologicae 8, no. 1 (March 16, 2016): 21–26. http://dx.doi.org/10.15835/nsb819780.

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The length-weight relationship and condition factor of Sarotherodon galilaeus and Oreochromis niloticus were observed in Strabag Lake. A total number of 365 individuals of the fish species were caught during the period of study with Sarotherodon galilaeus constituting 65.21% of the total catch while Oreochromis niloticus made up 34.79% of the catch. The mean weight (W) and mean total length (TL) were 56.04 ± 1.019 g and14.64 ± 0.103 cm respectively for S. galilaeus;62.86 ± 2.184 g and15.84 ± 0.171 cm respectively for O. niloticus. The values of constants a and b (growth exponent) were determined from the length and weight data which transformed into the linear equation of log W = log a + b log L. These parameters were then fitted to the exponential equation, W = [aL]b. The respective exponential equation for the length-weight relationship was W = 0.068[L]2.5 for S. galilaeus and W = 0.034[L]2.7 for O. niloticus which shows that both species exhibited negative allometric growth (b < 3.0). The correlation coefficient (r) and condition factor (K) recorded were 0.944 and 6.70 respectively for S. galilaeus and 0.911 and 3.49 respectively for O. niloticus specimens. The species showed negative allometric growth and were thriving well in the environment.

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Marijani, Esther, Johnson Nasimolo, Emmanuel Kigadye, Gbemenou Joselin Benoit Gnonlonfin, and Sheila Okoth. "Sex-Related Differences in Hematological Parameters and Organosomatic Indices of Oreochromis niloticus Exposed to Aflatoxin B1 Diet." Scientifica 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/4268926.

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A 24-week feeding experiment was conducted to assess whether males and females of Oreochromis niloticus exhibit differences in their hematological responses and organosomatic indices to dietary AFB1 contamination. Triplicate groups of O. niloticus (initial body weight: 24.1 ± 0.6 g) were fed with four diets (Diets 1 to 4) containing 0, 20, 200, and 2,000 μg AFB1 kg−1. A significant decrease (P<0.05) in hemoglobin (Hb), red blood cells (RBC), and hematocrit (Hct) was observed in AFB1 exposure groups, with the lowest levels recorded in the 2000 μg AFB1 kg−1 treatment. A significant increase in mean white blood cells (WBC), neutrophils, and lymphocytes was observed in AFB1 exposure groups. No sex-related differences in RBC, WBC, lymphocytes, monocytes, and neutrophils levels were observed. However, hemoglobin and hematocrit values for female O. niloticus were significantly lower than those for male O. niloticus. Organosomatic indices showed that the relative liver, kidney, and spleen weights were significantly higher (P<0.05) in the AFB1 supplemented group than in the control group. However, the effect of aflatoxin on organosomatic indices does not depend on sex but rather depends on the dose of aflatoxin in the diet. These results provide useful information for monitoring changes in the health status of male and female O. niloticus.

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Afe, Oluwafumilola Eunice, Adekunle Ayokanmi Dada, and Muhammed Lawal Salihu. "Dietary Effect of Corchorus olitorius Seeds on Growth Performance of Oreochromis niloticus Fingerlings." Aquaculture Studies 21, no. 3 (March 23, 2021): 101–7. http://dx.doi.org/10.4194/2618-6381-v21_3_02.

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Incorporating feed additives in diets of cultured fish is aimed at improving growth performance, immunity and carcass quality. Growth performance and some haematological parameters of Oreochromis niloticus fingerlings fed varying inclusion levels of Corchorus olitorius seeds were assessed in the study. O. niloticus fingerlings of initial mean weight 9.35±0.01g were evaluated for a period of 56 days. Five experimental diets were formulated at varying inclusion levels; 0g/100g (control), 0.5g/100g, 1.0g/100g, 1.5g/100g and 2.0g/100g of C. olitoriusseeds. All diets were isonitrogenous with each treatment having triplicates. O. niloticus fingerlings fed 1.5g/100g diet of C. olitoriusrecorded the best growth performance in terms of weight gain, feed conversion ratio (FCR) and specific growth rate (SGR). There was a significant increase in growth and nutritional performance of O. niloticus fingerlings with increasing inclusion of C. olitorius seeds (P<0.05). Significant increase in packed cell volume, white blood cell and haemoglobin were observed in treated O. niloticus fingerlings and there was no adverse effect of C. olitorius seeds on the haematological parameters of the fish. The study showed that C. olitorius seed at 1.5g/100g significantly improved survival rate, weight gain and feed conversion ratio as well as reduced mortalities in the treated groups.

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Seyoum, Seifu, and Irv Kornfield. "Taxonomic notes on the Oreochromis niloticus subspecies-complex (Pisces: Cichlidae), with a description of a new subspecies." Canadian Journal of Zoology 70, no. 11 (November 1, 1992): 2161–65. http://dx.doi.org/10.1139/z92-291.

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Relationships among the seven recognized subspecies of the widespread African cichlid Oreochromis niloticus (L.) were investigated using restriction endonuclease analysis of mitochondrial DNA. Changes in nomenclature are based on estimates of sequence divergence and concordant results from phenetic, cladistic, and maximum likelihood analyses of molecular character sets. Oreochromis niloticus cancellatus and O. n. filoa are reassigned to O. cancellatus as O. c. cancellatus and O. c. filoa, respectively. The tilapiine fishes of Lake Tana, Ethiopia, previously assigned to O. n. cancellatus, are here described as Oreochromis niloticus tana subsp.nov. in recognition of their distinctive molecular phenotypes.

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Haruna, Auwalu. "STOMACH CONTENT ANALYSIS OF SOME SELECTED FISH SPECIES FROM GILIMA RIVER, TAURA LOCAL GOVERNMENT, JIGAWA STATE, NIGERIA." JOURNAL OF ADVANCES IN AGRICULTURE 4, no. 3 (June 30, 2015): 455–59. http://dx.doi.org/10.24297/jaa.v4i3.4277.

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Four hundred (400) samples comprising eighty (80) samples each from five different species of Oreochromis niloticus, Bagrus bayad, Lates niloticus, Hydrocynus brevis and Synodontis vermiculatus were collected in batches using gill nets from 24th March -16th September, 2014; food and feeding habits were then assessed by analyzing the stomach content. The samples ranged in size from 525cm total length and 4.745g in weight. The stomach content analysis using frequency of occurrence method revealed that Oreochromis niloticus were herbivorous with dietary preference for plants and plant materials (47.27%), detritus (23.21%) and unidentifiable materials (6.06%), Bagrus bayad as carnivorous with dietary preference for fishes (52.17%), insects (23.57%), detritus (7.50%), Lates niloticus were also carnivorous with fishes (62.00%), fish parts (31.30%), insects (4.6%), Hydrocynus brevis proved carnivorous with dietary preference for fishes (42.16%), fish parts (17.83%), and Synodontis vermiculatus as an omnivore with dietary preference of plant materials (18.71%), fishes (12.69%), insect (12.19%) and detritus (17.48%).

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26

Adeosun, F. I., A. A. Akinyemi, W. O. Abdul, A. O. Agbon, and O. C. Odebiyi. "Assessment of heavy metals concentration in the intestine, kidney and muscle of Oreochromis niloticus in Federal University of Agriculture Abeokuta reservoir." Nigerian Journal of Animal Production 40, no. 1 (December 28, 2020): 191–96. http://dx.doi.org/10.51791/njap.v40i1.699.

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Different sizes of Oreochromis niloticus (Tilapia) were caught using cast net in FUNAAB reservoir. Water samples were also collected and analyzed for five metals: Lead, Chromium, Cadmium, Zinc, and Copper by Atomic Absorption Spectroscopy (AAS). During the experiment, three tissues were compared with the level of metal in water, Intestine, Kidney and Muscles. Generally, lower concentrations of metals were recorded in water than in fish tissues; lower concentration in the tissue of O niloticus except were found in the water which is less than the recommendation for human consumption by World Health Organisation. Lead was found to be the dominant in the intestine of Oreochromis niloticus while Chromium was recorded the least of all the metals. There is a significant difference (P<0.05) in heavy metal concentration in the tissue of O niloticus except for Chromium. Though, the heavy metals of interest were present in a measurable quantities, they are still within safe limits for consumption.

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Manurung, Merlyn D., Reiny A. Tumbol, Henneke D. Pangkey, Deiske A. Sumilat, and Remy E. P. Mangindaan. "The use of Sponge Crude Extract to Increase Growth and Immune Response of Nile Tilapia Oreochromis niloticus." JURNAL ILMIAH PLATAX 7, no. 1 (March 8, 2019): 256. http://dx.doi.org/10.35800/jip.7.1.2019.23228.

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This study aims to examine the effect of sponge crude extract addition to the fish feed on growth and non-specific immune response of nile tilapia (O. niloticus) and determine the most effective dose of the extract in raising the growth and the non-specific immune response of nile tilapia (O. niloticus). The sponge sample was macerated and then evaporated using a rotary vacuum evaporator until the sample became a paste and mixed with feed. The fish were fed for 14 days respectively as much as 5% of body weight per day with feeding frequency of two times a day. The results showed that addition of sponge crude extract to the fish feed gave good effect on the growth and the non-specific immune response of nile tilapia (O. niloticus) with best dose of 40 g / kg feed.Keywords: Sponge extract, fish immune response, fish growth, immune response, immunostimulant. ABSTRAKPenelitian ini bertujuan untuk menguji pengaruh penambahan ekstrak kasar spons pada pakan ikan terhadap pertumbuhan dan respon imun non spesifik ikan nila (Oreochromis niloticus) serta menentukan dosis ekstrak kasar spons yang paling efektif dalam meningkatkan pertumbuhan dan respon imun non spesifik ikan nila (Oreochromis niloticus). Sampel spons dimaserasi kemudian dievaporasi menggunakan rotary vacuum evaporator sehingga diperoleh ekstrak kasar berbentuk pasta yang kemudian dicampurkan pada pakan. Ikan uji diberi pakan perlakuan 5% dari bobot biomassa selama 14 hari dengan frekuensi pemberian pakan dua kali sehari. Hasil penelitian menunjukan bahwa penambahan ekstrak kasar spons pada pakan ikan memberikan pengaruh yang baik terhadap pertumbuhan dan respon imun non spesifik ikan nila (Oreochromis niloticus), yang mana dosis yang terbaik adalah 40 gr / Kg pakan.Kata Kunci : Ekstrak spons, respon imun ikan, pertumbuhan ikan, respon imun, imunostimulan.

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Hashem, Ola, Viola Zaki, and Rawia Adawy. "Incidence and molecular characterization of fungi and yeast isolated from cultured catfish and Nile tilapia." Mansoura Veterinary Medical Journal 21, no. 3 (September 29, 2020): 61–66. http://dx.doi.org/10.35943/mvmj.2020.21.311.

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Objective: To study the incidence and seasonal dynamics of different fungi affected freshwater fishes in Lake Manzala with molecular identification of the isolated fungi. Animals: 300 Nile tilapia (Oreochromis niloticus) and 300 catfish (Clarias gariepinus). Design: Descriptive study. Procedures: Random samples of Oreochromis niloticus (O. niloticus) and Clarias gariepinus (C. gariepinus) were collected from Manzala fish farms. Clinical and postmortem examination of fish was applied. Isolation and identification of different fungi were performed by conventional methods. Furthermore, the molecular characterization of isolated fungi was carried out. Results: C. gariepinus had a higher rate of infection with different fungal species than O. niloticus. Aspergillus spp. (Aspergillus niger and Aspergillus flavus) were the most fungal isolated from the examined fishes, followed by Penicillium spp. and Candida albicans. Aspergillus spp were detected in all seasons with a higher rate in summer and spring. A. flavus, A. niger, Penicillium spp. and C.albicans isolates were amplified from both C. gariepinus and O. niloticus at the specified molecular weight using PCR. Conclusion and clinical relevance: Fungal infection affected the fish showing different external and internal lesions, all species of Aspergillus were found in all seasons with a high rate in, hot seasons, summer and spring. The Prevalence of Penicillium and C. albicans were also reported. All fungal isolates were identified on the phenotypic and molecular bases.

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Nwude, D. O., J. O. Babayemi, and C. P. Ajibode. "Heavy Metals Level in Clarias gariepinus (Catfish), Oreochromis niloticus (Tilapia) and Chrysichthys nigroditatus (Bagrid catfish) collected from Ogun River, Ogun State, Nigeria." Journal of Applied Sciences and Environmental Management 24, no. 8 (September 9, 2020): 1433–40. http://dx.doi.org/10.4314/jasem.v24i8.19.

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Aquatic organisms such as fish are prone to contamination by water pollutants such as heavy metals. This study aims at assessing the levels of heavy metals in the fillet tissues of 75 fish samples comprising Clarias gariepinus (Catfish), Oreochromis niloticus (Tilapia) and Chrysichthys nigroditatus (Bagrid catfish) from five (5) different fishing locations along the Ogun River, Ogun State. The fillet tissues of the fish samples were digested and analysed for Zn, Pb, Fe, Cr and Cd using a Perkin Elmer, AAnalyst – 200 Atomic Absorption Spectrometer. The concentration of Zn in Clarias gariepinus, Oreochromis niloticus and Chrysichthys nigroditatus were 5.37±2.558, 6.58±2.35 and 5.11±1.55 respectively; while the levels of Pb in the species were Clarias gariepinus (1.30±3.099), Oreochromis niloticus (1.01±0.95) and Chrysichthys nigroditatus (0.35±0.59). Concentrations of Fe, Cr and Cd in the species were Clarias gariepinus (8.87±3.547, 0.08±0.098 and 0.09±0.100), Oreochromis niloticus (8.96±2.21, 0.12±0.11 and 0.11±0.11) and Chrysichthys nigroditatus (8.16±3.88, 0.11±0.11 and 0.11±0.11). The data revealed that most of these values were lower than FAO/WHO permissible except Pb and Cr. Some of the fish sampled may pose health hazards to the consumers. There is a need for constant monitoring of pollutants in Ogun River. Keywords: Heavy metals, Clarias gariepinus, Oreochromis niloticus, Chrysichthys nigroditatus, Ogun River

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MALIK, A., G. ABBAS, A. FATIMA, A. A. MUHAMMAD, K. SHABBIR, A. D. TALPUR, N. A. .KALHORO, A. J. MEMON, and S. S. A. SHAH. "Comparative Study to Investigate the Impact of Salinity on Breeding of tilapia-Red (Oreochromis niloticus×O. mossambicus)and tilapia-Nilotica(O. niloticus)in Captivity." SINDH UNIVERSITY RESEARCH JOURNAL -SCIENCE SERIES 51, no. 01 (March 12, 2019): 113–18. http://dx.doi.org/10.26692/sujo/2019.01.21.

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OBAYEMI, Oluwadamilare E., Olusola O. KOMOLAFE, Oluwakemi V. OKUNOLA, Sakirat T. ASAFA, and Mary A. AYOADE. "Length-Weight Relationships and Condition Factors of Three Tilapine Species in an Abandoned Gold Mine Reservoir, Igun, Southwestern Nigeria." Notulae Scientia Biologicae 11, no. 2 (June 28, 2019): 205–9. http://dx.doi.org/10.15835/nsb11210433.

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This study investigated the length-weight relationships and condition factors of three fish species in an abandoned gold mine reservoir. The fishes were caught on monthly basis between August 2015 and July 2016 using gill nets and traps. The results showed that Coptodon zillii, Oreochromis niloticus and Sarotherodon galilaeus had a mean total length and mean weight of 15.52±4.64 cm and 95.80±66.27 g; 15.27±4.18 cm and 89.54±63.20 g; 15.57±4.80 cm and 102.0±85.81 g respectively. Also, the mean condition factor obtained for the fish species are 2.24±0.52 in C. zillii; 2.26±0.62 in O. niloticus and 2.27±0.46 in S. galilaeus. Similarly, the slope (b) values and correlation coefficient for the three fish species are 2.018 and 0.969 for C. zillii; 1.977 and 0.926 for O. niloticus and 2.436 and 0.965 for S. galilaeus. Furthermore, the total length, weight and condition factor between C. zillii, O. niloticus and S. galilaeus differ significantly (p>0.05). The study concluded that despite being an abandoned gold mine reservoir, the environment is well suitable for the fishes.

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Poot Lopez, Gaspar R., Eucario Gasca Leyva, and Miguel A. Olvera Novoa. "Produccion de tilapia nilotica (Oreochromis niloticus L.) utilizando hojas de chaya (Cnidoscolus chayamansa." Latin American Journal of Aquatic Research 40, no. 4 (November 10, 2012): 835–46. http://dx.doi.org/10.3856/vol40-issue4-fulltext-2.

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Pizzelli, Sargis. "DNA Analysis on Oreochromis Niloticus." International Journal Papier Advance and Scientific Review 1, no. 1 (August 30, 2020): 1–7. http://dx.doi.org/10.47667/ijpasr.v1i1.6.

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This study aimed at investigating the tilapia fish (Oreochromis Niloticus) DNA. In analyzing Tilapia DNA, DNA extraction was carried out and PCR mixture was used for 20 μL of reaction, making Master Mix such as 1 μL Forward Primer, 1 μL Reverse Primer, 10 μL HotStar Taq Master Mix, 1 μL DNA Sample, 7 μL Nuslease Free Water. Mixing is done by adding the enzyme at the last stage. Then turn on the thermal cycler and set it according to the desired PCR conditions. Electrophoresis is carried out through stages such as Pre-Denaturation, Denaturation, Annealing, Extention, Final extension. The results showed that the virus did not infect tilapia (Oreochromis Niloticus). Tilapia sprayed on the gills with various doses showed the same results, namely no detection of KHV in mucus, kidneys, and liver.

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Meyer-Burgdorff, K. H., M. F. Osman, and K. D. Günther. "Energy metabolism in Oreochromis niloticus." Aquaculture 79, no. 1-4 (July 1989): 283–91. http://dx.doi.org/10.1016/0044-8486(89)90469-9.

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Gomiero, LM, GA Villares Junior, and F. Naous. "Seasonal and ontogenetic variations in the diet of Cichla kelberi Kullander and Ferreira, 2006 introduced in an artificial lake in southeastern Brazil." Brazilian Journal of Biology 70, no. 4 (November 2010): 1033–37. http://dx.doi.org/10.1590/s1519-69842010000500017.

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The diet of Cichla kelberi introduced in an artificial lake in Leme-SP was predominantly composed of common fish species (Oreochromis niloticus and C. kelberi). In the spring and summer, the most consumed item was O. niloticus. However, cannibalism was very common for this species. The high frequencies of O. niloticus and C. kelberi reveal that this species is adapted to a seasonal cycle, feeding on the most common prey in each period of the year, with a reduction of foraging activity during the winter. The diets were different among the immature and mature individuals suggesting that there are ontogenetic differences, mainly related to prey type, such as: Ephemeroptera consumed by the immature peacock bass and fish by the mature ones, besides the size of the prey.

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Ta'aladin, Zamdial. "ANALISA USAHA BUDIDAYA IKAN NILA MERAH (Oreochromis niloticus) SECARA TERPADU DENGAN AYAM (LONG-YAM) DI KABUPATEN BENGKULU UTARA." Jurnal AGRISEP 11, no. 2 (September 30, 2012): 262–69. http://dx.doi.org/10.31186/jagrisep.11.2.262-269.

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The objectives of this research were to know the feasibility of effort of Nila merah (Oreochromis niloticus) culture in integrated manner with chicken (Long-Yam). This research was conducted in Bengkulu Utara Regency, Bengkulu Province. The data were analyzed by financial-economic aspect using Net Benefit-Cost Ratio (Net B/C Ratio), NPV (Net Present Value) and IRR (Internal Rate of Return). The result of financial-economic aspect analysis were obtained Net B/C Ratio = 1.71, NPV = 5,103,169 and IRR = 33,00. Based on the result of this analysis showed that the effort unit of nila merah (Oreochromis niloticus) culture in a integrated manner with chicken is feasible and can developed in Bengkulu Utara Regency. Keywords : Oreochromis niloticus, culture, integrated, long-yam

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Witten, P. Eckhard, Wolfgang Villwock, and Lothar Renwrantz. "Haematogram of the tilapiaOreochromis niloticus(Cichlidae, Teleostei) and application of a putative phenoloxidase for differentiating between neutrophilic granulocytes and monocytes." Canadian Journal of Zoology 76, no. 2 (February 1, 1998): 310–19. http://dx.doi.org/10.1139/z97-202.

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To date, little is known about the haematology of the tilapiaOreochromis niloticus, which is one of the most important species in freshwater aquaculture worldwide. We present a haematogram of O. niloticus obtained by means of panoptical staining and cytochemical procedures such as demonstration of acid phosphatase, peroxidase, oxidase, esterase, and the CD14 receptor. Emphasis was placed on the differentiation between neutrophils and monocytes, which in the past has been difficult to accomplish for many fish species. Monocytes were detected with monoclonal antibodies raised against the human CD14 receptor. Neutrophilic granulocytes displayed oxidase activity, unique for this cell type. The enzyme has many properties of a phenoloxidase. In O. niloticus this enzyme is a good marker for distinguishing neutrophils from cells of the monocyte-macrophage lineage.

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Bittencourt, Luana Silva, Douglas Anadias Pinheiro, Melissa Querido Cárdenas, Berenice Maria Fernandes, and Marcos Tavares-Dias. "Parasites of native Cichlidae populations and invasive Oreochromis niloticus (Linnaeus, 1758) in tributary of Amazonas River (Brazil)." Revista Brasileira de Parasitologia Veterinária 23, no. 1 (March 2014): 44–54. http://dx.doi.org/10.1590/s1984-29612014006.

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This study provides the first investigation on acquisition of parasites in invasive O. niloticus by parasite species of native Cichlidae from the Igarapé Fortaleza basin, Northern Brazil. There were examined 576 specimens of 16 species of native cichlids and invasive O. niloticus collected in the main channel and the floodplain area of this tributary of Amazon River. The invasive O. niloticus was poorly parasitized having only Ichthyophthirius multifiliis, Trichodina centrostrigeata, Paratrichodina africana, Trichodina nobilis (Protozoa) and Cichlidogyrus tilapiae (Monogenoidea), and this host has not acquired any parasite species common to the native ichthyofauna region. In contrast, species of native cichlids showed rich fauna of parasites with predominance of Monogenoidea species, larvae and adults of Nematoda, Digenea, Cestoidea and Acanthocephala, besides four species of Protozoa and four Crustacea. However, only T. nobilis was acquired by native fish, the Aequidens tetramerus, which is a new host for this exotic Trichodinidae. In O. niloticus, well established in the region, the small number of helminth species may be associated with its rusticity, good adaptation in the new environment and also the presence of native parasites with relative specificity, but without ability to complete its life cycle in this invasive host of this ecosystem.

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Putri, Anggia Cahyati. "Pengaruh Insektisida Organoklorin Endosulfan Terhadap Daya Tetas Telur Ikan Nila (Oreochromis Niloticus)." BioScience 1, no. 1 (March 31, 2017): 43. http://dx.doi.org/10.24036/02017117431-0-00.

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Uncontrolled usage of pesticides can contaminate the environment such as water, soil, and air. This occurs because the residue of pesticides. One of them, organochlorine insecticides have widely used by farmers because it is persistent. This study aims to look at the effects caused by organochlorine insecticide endosulfan on hatchability of eggs tilapia (Oreochromis niloticus). This research was conducted CRD with 6 treatments and 4 replications. Concentrations of organochlorine endosulfan in treatment are determined based on the LC50. The treatment use organochlorine endosulfan at concentrations of 0.00395%, 0.00400%, 0.00405%, 0.00410% and 0.00415%. Then they observed for 4 days (96 hours). The data obtained and analyzed by ANOVA and followed by DNMRT (Duncan's New Multiple Range Test). The result showed organochlorine insecticide endosulfan significantly (p<0,05) affect hatchability of eggs tilapia (Oreochromis niloticus), but no significant effect on larval abnormalities. Hatchability of eggs tilapia (Oreochromis niloticus) and the highest larval abnormalities are found in P1 which is a control treatment. While the hatchability of eggs and larvae abnormalities lowest for the P6 treatment with concentrations of endosulfan treatment 0.00415%.Keywords: endosulfan, Tilapia (Oreochromis niloticus), hatchability

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Chen, Xiaowu, Yonghua Zhao, Yudong He, and Jinliang Zhao. "Methylation pattern polymorphism of cyp19a in Nile tilapia and hybrids." Open Life Sciences 13, no. 1 (September 22, 2018): 327–34. http://dx.doi.org/10.1515/biol-2018-0040.

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AbstractSkewed sex development is prevalent in fish hybrids. However, the histological observation and molecular mechanisms remain elusive. In this study, we showed that the interspecific hybrids of the two fish species, Oreochromis niloticus and Oreochromis aureus, had a male ratio of 98.02%. Microscopic examination revealed that the gonads of both male and female hybrids were developmentally retarded. Compared with the ovaries, the testes of both O. niloticus and hybrids showed higher DNA methylation level in two selected regions in the promoter of cyp19a, the gonadal aromatase gene that converts androgens into estrogens, cyp19a showed higher level gene expression in the ovary than in the testis in both O. niloticus and hybrid tilapia. Methylation and gene expression level of cyp19a were negative correlation between the testis and ovary. Gene transcription was suppressed by the methylation of the cyp19a promoter in vitro. While there is no obvious difference of the methylation level in testis or ovary between O. niloticus and hybrids. Thus, the DNA methylation of the promoter of cyp19a may be an essential component of the sex maintenance, but not a determinant of high male ratio and developmental retardation of gonads in tilapia hybrids.

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LEKEUFACK FOLEFACK, Guy Benoit, Chanceline MALA KENGNE, Bienvenu FEUDJIO DONGMO, and Abraham FOMENA. "Prevalence and Mean Intensity of Myxobolus spp. Parasitizing Oreochromis niloticus in Cameroon." International Journal of Biology 11, no. 2 (March 4, 2019): 35. http://dx.doi.org/10.5539/ijb.v11n2p35.

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Oreochromis niloticus, being one of the most commonly cultured fish on earth constitutes a favorable biotope for myxosporidia. This study provides information concerning the prevalence and mean intensity of Myxobolus species recorded in the kidney and spleen of O. niloticus. O. niloticus were sampled in farming ponds at Bamendou in Cameroon. Classic methods concerning fishing, fish autopsy and search of Myxosporidia were used. Prevalence and mean intensity was calculated. Data analysis based on the chi-square test, Kruskal-Wallis H test and Mann-Whitney U test was done. The study revealed the presence of six Myxobolus species in the kidney and spleen of O. niloticus. All parasites species appeared frequent while their mean intensity was low or very low. The occurrence of M. fotoi was statistically lower (P < 0.05) in the kidney’s anterior portion while the mean intensity of M. agolus was statistically (P < 0.01) higher in the anterior portion of the spleen. Myxobolus cichlidarum was not found in kidney of young fish and occurrence of M. agolus statistically increases (P < 0.05) with host age. Host sex has significant influence (P < 0.05) on: occurrence of M. agolus, M. fotoi, M. agolus, M. brachysporus and M. heterosporus; and mean intensity of M. fotoi. The study revealed that in O. niloticus, the kidney and spleen harboured the same parasites species and there were only few variations in occurrences and mean intensities of parasites species recorded as function of host organs, age and sex.

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Mahendra, Mahendra, Fazril Saputra, Citra Dina Febrina, Yusran Ibrahim, Farah Diana, and Sufal Diansyah. "PEMBERIAN ARANG AKTIF, ZEOLIT, DAN MANGANESE GREENSAND TERHADAP SURVIVAL Oreochromis niloticus PADA SISTEM TRANSPORTASI." JURNAL PERIKANAN TROPIS 7, no. 2 (December 5, 2020): 115. http://dx.doi.org/10.35308/jpt.v7i2.1909.

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This study aims to determine the effect of administration of activated charcoal, zeolite, and manganese greensand on survival Oreochromis niloticus. The experimental design used was a completely randomized design (CRD) with 4 treatments and 3 repetitions. The treatments are P1 = without administration (control), P2 = administration of activated charcoal 10 gr/l P3 = administration of Zeolite 10 gr/l and P4 = administration of manganese 10 gr/l. The parameter observed in this study was survival Oreochromis niloticus. The results showed that administration of activated charcoal, zeolites, and manganese greensand significantly affected the survival of Oreochromis niloticus. The best value is obtained at treatment P1; P2; and P3, each with the best average survival value of 96%; 91%; and 91%. The lowest cost incurred is the treatment P1 Rp. 66.200, - with SR 96% transportation.

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Putra, Ewang Mahendra, Gunanti Mahasri, and Luthfiana Aprilianita Sari. "INFESTASI EKTOPARAIT PADA IKAN NILA (Oreochromis niloticus) YANG DIPELIHARA DENGAN MENGGUNAKAN SISTEM AKUAPONIK DAN TANPA AKUAPONIK." Journal of Aquaculture and Fish Health 7, no. 1 (February 1, 2018): 42. http://dx.doi.org/10.20473/jafh.v7i1.11242.

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Penelitian ini bertujuan untuk mengetahui jenis ektoparasit dan perbedaan infestasi ektoparasit pada ikan nila (Oreochromis niloticus) yang dipelihara pada sistem akuaponik dan tanpa akuaponik. Metode penelitian rnenggunakan kuasi eksperimen intact-group comparison dengan terdapat dua perlakuan. Hewan uji menggunakan ikan nila dengan bobot 6-7 g/ekor. Hewan uji dipelihara di akuarium kaca berukuran 40cmx30cmx30cm yang diisi air sebanyak 15 liter. Perlakuan yang diberikan berupa pemeliharaan ikan nila dengan menggunakan sistem akuaponik dan pemeliharaan ikan nila tanpa menggunakan sistem akuaponik. Parameter yang diamati adalah jenis ektoparasit dan infestasi ektoparasit pada ikan nila. Jenis parasit yang ditemukan menginfestasi ikan nila (Oreochromis niloticus) pada pemeliharaan dengan menggunakan akuaponik maupun tanpa akuaponik adalah Argulus sp. Terdapat perbedaan yang nyata antara infestasi ektoparasit pada ikan nila (Oreochromis niloticus) yang dipelihara dengan sistem akuaponik dan tanpa akuaponik.

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Hong-Mei, Song, Bai Jun-Jie, Quan Ying-Chun, and Li Sheng-Jie. "Identification and structure analysis of three tilapia species using microsatellite markers." Chinese Journal of Agricultural Biotechnology 6, no. 2 (August 2009): 119–25. http://dx.doi.org/10.1017/s1479236209990258.

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AbstractSeventeen special loci were selected from 77 microsatellite markers to distinguish three varieties of tilapias, including the six differential loci UNH636, UNH117, UNH172, UNH738, UNH878 and UNH896 in Oreochromis aureus; five differential loci UNH913, UNH907, UNH222, UNH980 and UNH880 in O. niloticus; and six differential loci of UNH876, UNH899, UNH853, UNH932, UNH933 and UNH773 in O. mossambicus. Any one of the 17 loci could amplify particular bands to distinguish one tilapia from the other two. The genetic structure of O. aureus, O. niloticus and O. mossambicus stocks and their phylogenetic relationships were also analysed using these 17 loci. In total 142 alleles were detected, and the average number of alleles per locus was 8.35. Additionally, a clustering analysis was performed based on the result of the Popgen32 software package and phylogenetic trees were constructed by MEGA4 using the unweighted pair group method using arithmetic average (UPGMA). The results showed that the mean value of observed heterozygosity was 0.0941, 0.5490 and 0.2588, the mean value of expected heterozygosity was 0.1089, 0.7230 and 0.1965, and the polymorphism information content was 0.0869, 0.7149 and 0.1643, in O. aureus, O. niloticus and O. mossambicus, respectively. The UPGMA tree demonstrated that O. aureus was more closely related to O. mossambicus than to O. niloticus.

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Ifedayo, Oluwalola Oluwatuyi, Fagbenro Oyedapo Adewale, and Adebayo Olabode Thomas. "Comparative Study on Growth and Economic Performances of Nile Tilapia, Oreochromis niloticus Reared Under Different Culture Enclosures in Akure, Nigeria." Aquaculture Studies 20, no. 2 (September 1, 2020): 91–98. http://dx.doi.org/10.4194/2618-6381-v20_2_03.

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This study was conducted to determine the growth and economic performances of Nile Tilapia Oreochromis niloticus reared in different culture enclosures in Akure. 900 O. niloticus fingerlings (mean weight 8.30±0.06g) were acclimatized for 24 hours, out of which one hundred fingerlings were randomly selected and distributed into the three prepared culture enclosures (plastic tanks, sandcrete tanks and earthen ponds) of the same size (3.0m X 2.8m X 1.0m). Each treatment was in triplicates. The fingerlings were fed with formulated standard diet of 30% crude protein at 5% body weight. Fish were fed twice daily for 185 days. The total yield of fish was significantly greater (P<0.05) in earthen pond, 1.93kg than those in sandcrete 1.47kg and plastic tanks 1.42kg. There was significant difference (P<0.05) in final weight gain, feed conversion ratio, mean daily weight gain between O. niloticus fingerlings stocked in the three culture enclosures. Fish in earthen pond had the highest weight gain (135.9g) and specific growth rate (1.54%). There was significant difference (P<0.05) in the Net profit obtained and benefit cost ration for the three culture enclosures. The study considered earthen pond to be more productive and the most ideal culture enclosure for growth optimization of O. niloticus.

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Ogutu-Ohwayo, Richard, and R. E. Hecky. "Fish Introductions in Africa and Some of Their implications." Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (December 19, 1991): 8–12. http://dx.doi.org/10.1139/f91-299.

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Fish introductions in Africa have been made at various spatial scales from small fish ponds to the largest lakes, primarily to sustain or increase production, though some were to develop sport fisheries and to control unwanted organisms. Some introductions have fulfilled their objective in the short term, but several "successful" introductions have created uncertainties about their long-term sustainability. Lates niloticus, Oreochromis niloticus, O. leucostictus, Tilapia melanopleura and T. zilli were introduced into Lakes Victoria and Kyoga in 1950's and early 1960's; by the 1980's L. niloticus and O. niloticus dominated the fisheries, having virtually eliminated a number of endemic species. In Lake Victoria, the loss of genetic diversity has been accompanied by a loss of trophic diversity; the transformation of the fish community coincided with profound eutrophication (algal blooms, fish kills, hypolimnetic anoxia) which might be related to alterations of the lake's food-web structure. By contrast, the introduction of a planktivore, Limnothrissa miodon into Lake Kivu and the Kariba reservoir has established highly successful fisheries with little effect on the pre-existing fish community or trophic ecology. The endemic species-rich African Great Lakes may be particularly sensitive to introductions. Species extinctions, introgressive hybridization and ecosystem alterations may occur following introductions.

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Wakawa, A. I., and S. B. Audu. "Histopathological alterations in gills, kidney and liver of Nile Tilapia (Oreochromis niloticus) fingerlings exposed to aqueous leaf extract of Desert Date (Balanites aegyptiaca)." Zoologist (The) 18, no. 1 (April 8, 2021): 67–73. http://dx.doi.org/10.4314/tzool.v18i1.12.

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One of the many biomarkers for determining the effects of pollutants on fish is changes in organ histopathology. Leaves of Balanites aegyptiaca have been reported to have phytochemicals with fish anaesthetic property. This study sought to determine the effect of graded acute concentrations (200.00, 250.00, 300.00.350.00 and 400.00 mg/L) of B. aegyptiaca on histopathology of gills, kidney and liver of mixed sex of Oreochromis niloticus fingerlings. A total of 120 O. niloticus fingerlings (mean weight 23±0.03 g and mean total length 12.50±0.39 cm) were exposed to the plant extract. Paraffin wax method and haematoxylin-eosin staining techniques of tissue processing were adopted for the examination of the gills, kidney and liver. Dose-dependent histopathological changes were observed in the three organs (gills, kidney and liver) i.e. histopathological alterations increase with increase in concentration of the plant extract. Gills showed lamellae fusion, haemorrhage, desquamation, atrophy and secondary lamellae erosion while kidney and liver indicated atrophy, necrosis, haemorrhage, hyperplasia and hypertrophy. Structural alterations were evident in the gills, kidney and liver of O. niloticus fingerlings exposed to the concentrations of aqueous crude leaf extract of B. aegyptiaca therefore it should be used with caution during fish anaesthesia. Keywords: Histopathology; Gill; Kidney; Liver; Balanites aegyptiaca; Oreochromis niloticus.

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Yacoub, Amal M., Soaad A. Mahmoud, and Amaal M. Abdel-Satar. "Accumulation of heavy metals in tilapia fish species and related histopathological changes in muscles, gills and liver of Oreochromis niloticus occurring in the area of Qahr El-Bahr, Lake Al-Manzalah, Egypt." Oceanological and Hydrobiological Studies 50, no. 1 (March 1, 2021): 1–15. http://dx.doi.org/10.2478/oandhs-2021-0001.

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Abstract Accumulation of metals (Fe, Zn, Cu, Mn, Pb, Cd and Ni) in the muscles and gills of Oreochromis niloticus, Oreochromis aureus and Tilapia zillii was assessed based on seven locations in the Qahr El-Bahr area in Lake Al-Manzalah. The average accumulation of metals was in the following order: Tilapia zillii > Oreochromis aureus > Oreochromis niloticus. To determine the risk of fish consumption, the estimated daily intake, carcinogenic, non-carcinogenic and relative risk indices were calculated. The results indicate that the intake of individual metals through the consumption of fish is almost safe for human health, whereas the intake of combined metals poses a high potential health risk to consumers. Assessment of carcinogenic risk of Cd and Ni from the consumption of tilapia species indicates that consumers are at risk of cancer. The contribution of Pb and Cd to the overall relative risk index ranged from 34% to 41%. Of the three species studied, Oreochromis niloticus is relatively safe for consumption as it poses the least health hazard, while Tilapia zillii is more predisposed to accumulate metals in its tissues. Histopathological changes were observed in the muscles, gills and liver of Oreochromis niloticus as a result of heavy metal accumulation in these organs.

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Mohamed-Ahmed, M. M. "Olfactory responses of Glossina fuscipes fuscipes (Diptera: Glossinidae) to the monitor lizard Varanus niloticus niloticus." Bulletin of Entomological Research 88, no. 3 (June 1998): 311–17. http://dx.doi.org/10.1017/s000748530002592x.

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AbstractVisual and olfactory responses of Glossina fuscipes fuscipes Newstead to the monitor lizard, Varanus niloticus niloticus Laurenti were studied using various catching devices near Lake Victoria, Kenya. Electric nets baited with visible lizards caught more males (×2.1) and significantly more females (×2.0) than unbaited nets. Lizards concealed in electrified black PVC pipe models, simulating the shape and size of a monitor lizard, increased significantly the catches of tsetse by 2.1 times. Fresh lizard urine dispensed at an evaporation rate of 500 to 1000 mg/h also increased significantly the catches of flies at biconical traps, electrified models and electric nets. Identification of chemical constituents of the odour could improve monitoring and control strategies for G. f. fuscipes, and possibly for other palpalis tsetse species.

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Hagar, Elsadig. "Effect of 17 Aplha Methyl Testosterone on Sex Reversal of Oreochromis Niloticus Fry." Biotechnology and Bioprocessing 2, no. 3 (March 30, 2021): 01–05. http://dx.doi.org/10.31579/2766-2314/033.

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The effect of oral application of three concentrations of 17 α methyl testosterone (17 α-MT) in sex reversal of Oreochromis niloticus fry was studied. About 1,200 day one O. niloticus larvae with an average weight of 0.002g distributed into 12 plastic container (each 14L capacity). The experiment consisted of four treatments and three replicates for 17 α-MT application in stage one, and 12 happa (1m×1m×1m) in stage two for fry rearing. The male% increased significantly (p<0.05) with increase of 17 α-MT concentration. T1 (63%) yielded 84%; T2 (78.3%) yielded 87% and T3 (86.7%) yielded (89%). Survival rates significantly decreased (p<0.05) with the increase of 17 α-MT level (T3, T2 and T1, respectively). The proved that oral application of 17 α-MT is useful in sex reversal and production of male of O. niloticus.

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Journal articles on the topic 'O. niloticus'

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