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Journal articles on the topic 'Synodontis'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Fahmi, Melta Rini, Ruby Vidia Kusumah, Idil Ardi, Shofihar Sinansari, and Eni Kusrini. "DNA BARCODING IKAN HIAS INTRODUKSI." Jurnal Riset Akuakultur 12, no. 1 (May 30, 2017): 29. http://dx.doi.org/10.15578/jra.12.1.2017.29-40.

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Identifikasi spesies menjadi tantangan dalam pengelolaan ikan hias introduksi baik untuk tujuan budidaya maupun konservasi. Penelitian ini bertujuan untuk melakukan identifikasi molekuler ikan hias introduksi yang beredar di pembudidaya dan pasar ikan hias Indonesia dengan menggunakan barcode DNA gen COI. Sampel ikan diperoleh dari pembudidaya dan importir ikan hias di kawasan Bandung dan Jakarta. Total DNA diekstraksi dari jaringan sirip ekor dengan menggunakan metode kolom. Amplifikasi gen target dilakukan dengan menggunakan primer FishF1, FishF2, FishR1, dan FishR2. Hasil pembacaan untai DNA disejajarkan dengan sekuen yang terdapat pada genbank melalui program BLAST. Identifikasi dilakukan melalui kekerabatan pohon filogenetik dan presentasi indeks kesamaan dengan sekuen genbank. Hasil identifikasi menunjukkan sampel yang diuji terbagi menjadi lima grup, yaitu: Synodontis terdiri atas lima spesies, Corydoras: empat spesies, Phseudoplatystoma: tiga spesies, Botia: tiga spesies, dan Leporinus: tiga spesies dengan nilai boostrap 99-100. Indeks kesamaan sekuen menunjukkan sebanyak 11 spesies memiliki indeks kesamaan 99%-100% dengan data genbank yaitu Synodontis decorus, Synodontis eupterus, Synodontis greshoffi, Botia kubotai, Botia lohachata, Rasbora erythromicron, Corydoras aeneus, Gyrinocheilus aymonieri, Eigenmannia virescens, Leporinus affinis, Phractocephalus hemioliopterus. Dua spesies teridentifikasi sebagai hasil hibridisasi (kawin silang) yaitu Leopard catfish (100% identik dengan Pseudoplatystoma faciatum) dan Synodontis leopard (100% identik dengan Synodontis notatus). Hasil analisis nukleotida penciri diperoleh tujuh nukleotida untuk Synodontis decora, 10 nukleotida untuk Synodontis tanganyicae, 13 nukleotida untuk Synodontis euterus, empat nukleotida untuk Synodontis notatus, dan 14 untuk Synodontis grashoffi. Kejelasan identifikasi spesies ikan menjadi kunci utama dalam budidaya, perdagangan, manajemen, konservasi, dan pengembangan ilmu pengetahuan.Species identification becomes a new challenge in the management of ornamental fish either for cultivation, or for conservation proposes. The objective of this study was to identify currently existing introduced ornamental fish in Indonesian farmers and markets using DNA barcodes COI gene. Fish samples were collected from farmers and importers of ornamental fish in Bandung and Jakarta. Total genome was extracted from caudal fin tissue using the column method. Amplification of the target gene was done by using FishF1, FishF2, FishR1, and FishR2 primers. DNA sequence was aligned with the sequences from genbank by BLAST program. Species identification was decided through the phylogenetic tree and similarity index with genbank sequences. The results showed that all of tested samples fall into five groups; Synodontis consisted of five species, Corydoras four species, Phseudoplatystoma four species, Botia three species, and Leporinus three species with 99-100 boostrap value. Sequence similarity index showed around 11 species have 99%-100% similarity index with sequence data on genbank which are Synodontis decorus, Synodontis eupterus, Synodontis greshoffi, Botia kubotai, Botia lohachata, Rasbora erythromicron, Corydoras aeneus, Gyrinocheilus aymonieri, Eigenmannia virescens, Leporinus affinis, Phractocephalus hemioliopterus. Two species were identified as hybridization product (interbreeding) including leopard catfish (100% identical with Pseudoplatystoma faciatum) and the leopard Synodontis (100% identical with Synodontis notatus). Analysis of nucleotide diagnostic showed Synodontis decora has seven nucleotides diagnostic, Synodontis tanganyicae 10 nucleotides, Synodontis euterus 13 nucleotides, Synodontis notatus four nucleotides, and Synodontis grashoffi 14 nucleotides. The correct identification of fish species is a useful tool for aquaculture, global marketing, management or conservation, and academic/scientific purpose.
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2

Dhewantara, Yudha Lestira, and Firsty Rahmatia. "Rekayasa Maturasi Menggunakan Hormon Oodev Terhadap Ikan Synodontis (Synodontis Sp)." Akuatika Indonesia 2, no. 1 (March 3, 2017): 35. http://dx.doi.org/10.24198/jaki.v2i1.23409.

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Pematangan gonad merupakan salah satu fase penting pada siklus reproduksi ikan.Upaya hormonal memang bisa mempercepat proses pematangan dan pemijahan serta membantu pemijahan ikan yang sulit memijah bila tidak berada dalam habitatnya. Ikan synodontis memang mampu memijah sepanjang tahun. Namun, masalah yang muncul adalah kualitas hasil pemijahannya yang tidak selalu sama atau stabil, salah satu contoh hormon yang bisa digunakan adalah oodev yang mengandung Pregnant Mare Serum Gonadotropin (PMSG), hormon ini banyak mengandung unsur daya kerja Folicle Stimulating Hormone (FSH) yang berperan dalam pematangan gonad awal atau vitelogenesis. Penyerapan vitelogenin akan membuat oosit mencapai ukuran tertentu yang kemudian siap untuk diovulasikan. Penelitian ini bertujuan untuk mengkaji penyuntikan oodev terhadap kinerja reproduksi dan maturasi ikan synodontis. Calon induk ikan synodontis diberi perlakuan dengan injeksi hormonal dengan: K1 (tanpa pemberian hormon/kontrol), A1 (Dosis 0,5 mL/kg), A2 (Dosis 1 mL/kg), A3 (Dosis 1,5 mL/kg), dan A4 (2 mL/kg). Hasil penelitian menunjukkan bahwa Induksi maturasi ikan synodontis dapat dilakukan dengan penyuntikkan OODEV (1,5 mL/kg bobot tubuh) sebanyak empat kali secara berkala selama empat minggu.
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3

Nurhidayat, Yudha Lestira Dhewantara, and Firsty Rahmatia. "Rekayasa Rematurasi Ikan Synodontis Menggunakan Hormon Oodev Pada Dosis Berbeda Melalui Penyuntikan." Jurnal Ilmiah Satya Minabahari 2, no. 2 (February 28, 2017): 147–56. http://dx.doi.org/10.53676/jism.v2i2.37.

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Ikan synodontis merupakan salah satu ikan hias yang banyak digemari dan diminati oleh para pecinta ikan. Hal ini mengindikasikan kebutuhan benih juga akan meningkat dari tahun ke tahun. Namun masalah yang muncul adalah kualitas hasil pemijahannya yang tidak terlalu sama atau stabil. Tujuan penelitian ini adalah mengkaji penyuntikan oodev terhadap kinerja mengkaji penyuntikan oodev terhadap kinerja reproduksi dan maturasi ikan synodontis. Calon induk ikan synodontis diberi perlakuan dengan injeksi hormonal dengan: K1 (tanpa pemberian hormon/kontrol), A1 (Dosis 0,5 mL/kg), A2 (Dosis 1 mL/kg), A3 (Dosis 1,5 mL/kg), dan A4 (2 mL/kg). Hasil penelitian menunjukkan bahwa rekayasa rematurasi ikan synodontis dapat dilakukan dengan penyuntikkan OODEV (1,5 mL/kg bobot tubuh) sebanyak empat kali secara berkala selama empat minggu.
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4

CHAMBRIER, ALAIN DE, TOMÁŠ SCHOLZ, ZUHEIR N. MAHMOUD, JEAN MARIAUX, and MILOSLAV JIRKŮ. "Tapeworms (Cestoda: Proteocephalidea) of Synodontis spp. (Siluriformes) in Africa: survey of species and their redescriptions." Zootaxa 2976, no. 1 (July 26, 2011): 1. http://dx.doi.org/10.11646/zootaxa.2976.1.1.

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Proteocephalidean tapeworms parasitic in Synodontis spp. (Siluriformes: Mochokidae) in Africa are critically reviewed based on examination of their type specimens and extensive new material from Kenya and Sudan. Proteocephalus synodontis Woodland, 1925 and Proteocephalus membranacei Troncy, 1978 are considered to be valid and both species are redescribed. Proteocephalus synodontis differs from congeners parasitic in other African freshwater fishes, including P. membranacei, in the possession of an extraordinarily developed inner longitudinal musculature formed by massive bundles of muscle fibres. A considerable variability was found in the size (35–140 × 30–75 μm) and shape (from elongate, tear-shaped to spherical) of the apical organ, which was present in all specimens from the Nile River basin in the Sudan, but absent in all but two juvenile specimens from Lake Turkana in Kenya. A congruent low molecular variability was also observed and these slight morphological and genetic differences may indicate ongoing allopatric speciation of tapeworms from the two previously connected basins. Nevertheless, all tapeworms were identical in all other morphological and molecular characteristics and are considered conspecific. Proteocephalus largoproglottis Troncy, 1978 from Synodontis membranacea from Lake Chad is synonymized with P. membranacei described from the same host and locality. Proteocephalus synodontis and P. membranacei differ from each other in the development of the inner longitudinal musculature, shape of the scolex and presence of weakly developed, almost indistinguishable ventral osmoregulatory canals in the latter species.
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5

Mbondo, Jonathan A., Jacques Nack, Arnold R. Bitja Nyom, Antoine Pariselle, and Charles F. Bilong Bilong. "New species of Synodontella (Monogenea, Ancyrocephalidae) gill parasites of two Synodontis spp. (Pisces, Mochokidae) from the Boumba River (Congo Basin, East Cameroon)." Parasite 26 (2019): 37. http://dx.doi.org/10.1051/parasite/2019037.

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Three new species of Synodontella Dossou & Euzet, 1993 are described from two species of Synodontis (Mochokidae) collected from the middle course of the Boumba River (East Cameroon): Synodontella angustupenis n. sp. from Synodontis nummifer, Synodontella longipenis n. sp. and Synodontella simplex n. sp. from Synodontis decorus. These new species are different from the other Synodontella species already described due to their horseshoe-shaped dorsal transverse bars. Synodontella angustupenis differs from S. longipenis and S. simplex by the morphology of its penis, a thin tube, and its accessory piece, bifid at its extremity. Synodontella longipenis differs from the other two species by the morphology and the size of its male copulatory organ, which is very long. Synodontella simplex differs from S. angustupenis and S. longipenis by the shape of its penis, which is simple, and of its accessory piece, with a developed heel. The difference between the dorsal transverse bars of Synodontella species from the Sanaga River in Cameroon (and other localities in Africa), slightly curved, and those from the Boumba River, horseshoe-shaped, makes it possible to separate Synodontella species into two different subgroups. This difference can be explained by a long isolation period of the hosts, living in different river basins, followed by the divergence of the parasite populations (vicariant speciation).
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6

van der Bank, F. H. "Allozyme variation in Synodontis leopardinus (Pisces, Siluriformes)." Comparative Biochemistry and Physiology Part B: Comparative Biochemistry 105, no. 2 (June 1993): 333–36. http://dx.doi.org/10.1016/0305-0491(93)90237-y.

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7

Nurhadi, S., S. Murniasih, and N. N. Dewi. "The effect of different feeding on growth, feed conversion ratio and feed efficiency in synodontis (Synodontis eupterus) seed." IOP Conference Series: Earth and Environmental Science 718, no. 1 (March 1, 2021): 012092. http://dx.doi.org/10.1088/1755-1315/718/1/012092.

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8

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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9

Ekinadose Orose, Edafe Odioko, and Okechukwu Kenneth Wokeh. "Catalogue of Some Saltwater and Freshwater Fish Species of the Niger Delta Region of Nigeria." World Journal of Advanced Research and Reviews 9, no. 3 (March 30, 2021): 056–84. http://dx.doi.org/10.30574/wjarr.2021.9.3.0075.

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The study was done to review some saltwater and freshwater fish species in the Niger Delta region of Nigeria. The Niger Delta is one of the most prominent regions in Nigeria, endowed with several water bodies that are distributed as freshwater like rivers, lakes, streams and creeks. These freshwater ecosystems in the region, are abundantly endowed with fish species such as Clarias gariepinus, Pila ovate, Labeo coubie, Synodontis budgetti and Synodontis eupterus. Apart from the freshwaters, the region also has vast marine ecosystem with abundance of fish species such as Elops lacerta, Mugil cephalus, Thais coronata, Periophthalmus papilio, Tympanotonus fuscatus, and Sardinella maderensis. Unfortunately, many of these fish species are endangered due to constant pollution in the Niger delta regional coastal environment. As a result, it is important to document some available freshwater and marine water fish species which will serve as a reference material for both academics and research institutions, should any of the fish species go into extinction.
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10

Day, Julia J., and Mark Wilkinson. "On the origin of the Synodontis catfish species flock from Lake Tanganyika." Biology Letters 2, no. 4 (September 12, 2006): 548–52. http://dx.doi.org/10.1098/rsbl.2006.0532.

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Species flocks within Great Lakes provide unique insights into the factors affecting diversification. Lake Tanganyika (LT) is of particular interest because it contains many endemic groups for which general factors affecting diversification can be discerned. Here, we present the first phylogenetic study of the LT Synodontis (Siluriformes, Mochokidae) species flock using mtDNA sequence data. Our data reveal some previously unrecognized species diversity and indicate that the LT species flock is not monophyletic, and that two closely related clades of endemics may have independently colonized LT. Other comparable small species flocks are characterized by a single colonization event. Molecular date estimates of the timing of the initial within-lake diversification of the LT endemics, based on a fossil calibration, are comparable to those reported for other groups, suggesting that extrinsic factors maybe important common causes of clade diversification. The basal divergence in the sampled Synodontis reveals an East–West African faunal split seen in many terrestrial, but few aquatic groups, the timing of which coincides with East African rifting events.
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11

Green, J. "Haematology and habits in catfish of the genus Synodontis." Journal of Zoology 182, no. 1 (August 20, 2009): 39–50. http://dx.doi.org/10.1111/j.1469-7998.1977.tb04139.x.

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12

Day, Julia J., Claire R. Peart, Katherine J. Brown, John P. Friel, Roger Bills, and Timo Moritz. "Continental Diversification of an African Catfish Radiation (Mochokidae: Synodontis)." Systematic Biology 62, no. 3 (February 5, 2013): 351–65. http://dx.doi.org/10.1093/sysbio/syt001.

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Agbozu, I. E., I. K. E. Ekweozor, and K. Opuene. "Survey of heavy metals in the catfish Synodontis clarias." International Journal of Environmental Science & Technology 4, no. 1 (January 1, 2007): 93–97. http://dx.doi.org/10.1007/bf03325966.

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14

Mašová, Š. "Structure of the cephalic end and eggs of female Cithariniella khalili Petter, Vassiliadès et Troncy, 1972 (Nematoda: Pharyngodonidae), a parasite of African fishes." Helminthologia 49, no. 2 (June 1, 2012): 115–18. http://dx.doi.org/10.2478/s11687-012-0023-0.

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AbstractScanning electron microscopy was used to study the female surface morphological characteristics of the mouth opening (lips and such adjacent structures as amphids, papillae and chitinous ribbed flaps), caudal area (vulva, anus), and eggs with filaments on poles of the pharyngodonid species Cithariniella khalili Petter, Vassiliadès et Troncy, 1972, obtained from Synodontis frontosa Vaillant at Lake Turkana in north-western Kenya.
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15

FRIEL, JOHN P., and THOMAS R. VIGLIOTTA. "Synodontis acanthoperca, a new species from the Ogôoué River system, Gabon with comments on spiny ornamentation and sexual dimorphism in mochokid catfishes (Siluriformes: Mochokidae)." Zootaxa 1125, no. 1 (February 10, 2006): 45. http://dx.doi.org/10.11646/zootaxa.1125.1.3.

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Synodontis acanthoperca, a new species of mochokid catfish, is described from rapids within the Ogôoué River system of Gabon. This relatively small species (<50 mm SL) is distinguished from all congeners by a distinctive pigmentation pattern that includes a pair of dark patches on the caudal fin and by the presence of hypertrophied opercular spines in sexually mature males.
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Montchowui, Elie, Jacques Dougnon, Florian Dadjo Daga, Jedirfort Houessiono, Philippe Laleye, and Nestor Sakiti. "Cutaneous and Gastrointestinal Helminth Parasites of the Fish Synodontis schall and Synodontis nigrita (Siluriformes: Mochokidae) from the Lower Oueme Valley in South Benin." Research Journal of Biological Sciences 7, no. 8 (August 1, 2012): 320–26. http://dx.doi.org/10.3923/rjbsci.2012.320.326.

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17

Boyle, Kelly S., Orphal Colleye, and Eric Parmentier. "Sound production to electric discharge: sonic muscle evolution in progress in Synodontis spp. catfishes (Mochokidae)." Proceedings of the Royal Society B: Biological Sciences 281, no. 1791 (September 22, 2014): 20141197. http://dx.doi.org/10.1098/rspb.2014.1197.

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Elucidating the origins of complex biological structures has been one of the major challenges of evolutionary studies. Within vertebrates, the capacity to produce regular coordinated electric organ discharges (EODs) has evolved independently in different fish lineages. Intermediate stages, however, are not known. We show that, within a single catfish genus, some species are able to produce sounds, electric discharges or both signals (though not simultaneously). We highlight that both acoustic and electric communication result from actions of the same muscle. In parallel to their abilities, the studied species show different degrees of myofibril development in the sonic and electric muscle. The lowest myofibril density was observed in Synodontis nigriventris , which produced EODs but no swim bladder sounds, whereas the greatest myofibril density was observed in Synodontis grandiops , the species that produced the longest sound trains but did not emit EODs. Additionally, S. grandiops exhibited the lowest auditory thresholds. Swim bladder sounds were similar among species, while EODs were distinctive at the species level. We hypothesize that communication with conspecifics favoured the development of species-specific EOD signals and suggest an evolutionary explanation for the transition from a fast sonic muscle to electrocytes.
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Ohnishil, Ken, Akihisa Takahashi, Masato Koyama, and Takeo Ohnishi. "Postural control under clinorotation in upside-down catfish, Synodontis nigriventris." Biological Sciences in Space 10, no. 4 (1996): 252–58. http://dx.doi.org/10.2187/bss.10.252.

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19

Барон, В. Д., and А. А. Орлов. "Электрические разряды перистоусых сомов Synodontis (Mochokidae): особенности и механизмы электрогенерации." Вопросы ихтиологии 61, no. 2 (2021): 219–25. http://dx.doi.org/10.31857/s0042875221020016.

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20

Abass, Anifowoshe T., Oladipo S. Olayinka, Adebayo O. Mutolib, Eboh O. Solomon, Abdussalam A. Rasheedat, Adegbenro A. Monsuru, Ojo T. Ifeoluwa, et al. "Induction of Micronuclei, Base-pair Substitution Mutation and Excision-repair Deficient by Polluted Water from Asa River in Nigeria." Annals of Science and Technology 4, no. 2 (December 1, 2019): 68–77. http://dx.doi.org/10.2478/ast-2019-0012.

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AbstractAsa river is a major river designated to supply millions of people of Ilorin, Kwara State, Nigeria potable water for drinking but its managements is of grave concern due to anthropogenic activities. Thus, evaluation of genotoxicity of this river was carried out by subjecting the water samples and fish therein to three bioassays (Micronucleus (MN) assay, Ames test and SOS-chromo test). Physicochemical parameters and heavy metals were analysed at three different stations (Aliara (SI), Unity (SII) and Tuyil (SIII)) of the river. In SII, most of the heavy metals analysed were above the acceptable limits compare to SI and SIII. The peripheral erythrocyte of the fishes (Oreochromis niloticus, Synodontis batensoda, Synodontis eupterus, Clarias gariepinus and Clarias angullaris) at SI and SII stations showed a significant (p<0.05) induction of MN and different nuclear abnormalities (NA). Water samples from the three stations subjected to Ames test (Salmonella typhimurium TA100) and SOS chromotests (Escherichia coli PQ37) at 25%, 50% and 100% concentrations showed statistically significant (p<0.05) induction of DNA damage at all concentrations in the two tester strains, thus indicating base-pair substitution mutation and excision-repairdeficient, respectively, by the water samples. Therefore, drinking of this water and/or consumption of fish from this river should be taken with caution to avoid a carcinogenic risk.
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Cohen, Marcus S., M. Brent Hawkins, David W. Stock, and Alexander Cruz. "Early life-history features associated with brood parasitism in the cuckoo catfish, Synodontis multipunctatus (Siluriformes: Mochokidae)." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1769 (February 11, 2019): 20180205. http://dx.doi.org/10.1098/rstb.2018.0205.

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The cuckoo catfish, Synodontis multipunctatus , is the only known obligate brood parasite among fishes, exploiting the parental care of mouthbrooding cichlids endemic to Lake Tanganyika. Comparisons of this system to brood parasitism in birds may reveal broader principles that underlie the evolution of this life-history strategy in vertebrates. However, little is known about the features of the cuckoo catfish that enable this species to successfully parasitize cichlids. Here, we examine early ontogeny of the cuckoo catfish and compare it to that of its cichlid hosts as well as a non-parasitic congener. We found that cuckoo catfish embryos develop and hatch in advance of host embryos, and begin feeding on cichlid young just as they start to hatch. Overall timing of ontogeny in the cuckoo catfish was found to be similar to that of the substrate-spawning congener Synodontis lucipinnis , suggesting that more rapid development of the cuckoo catfish relative to cichlids is not a unique adaptation to brood parasitism. However, we found that cuckoo catfish progeny exhibit extensive morphological differences from S . lucipinnis , which may represent adaptations to brood parasitism. These life-history observations reveal both similarities and differences between the cuckoo catfish system and brood parasitism in other lineages. This article is part of the theme issue ‘The coevolutionary biology of brood parasitism: from mechanism to pattern’.
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Olojo, E. A. A., A. O. Dosumu, and K. B. Olurin. "Fecundity and Gonadosomatic Index of Synodontis ngrita from River Osun Southwest Nigeria." Journal of Fisheries International 7, no. 1 (January 1, 2012): 26–29. http://dx.doi.org/10.3923/jfish.2012.26.29.

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Cohen, Marcus S., M. Brent Hawkins, Janelle Knox-Hayes, Anna C. Vinton, and Alexander Cruz. "A laboratory study of host use by the cuckoo catfish Synodontis multipunctatus." Environmental Biology of Fishes 101, no. 9 (July 14, 2018): 1417–25. http://dx.doi.org/10.1007/s10641-018-0788-1.

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Sipos, Michael J., Taylor N. Lipscomb, Amy L. Wood, Shane W. Ramee, Craig A. Watson, and Matthew A. DiMaggio. "Evaluation of cGnRH IIa for induction spawning of two ornamental Synodontis species." Aquaculture 511 (September 2019): 734226. http://dx.doi.org/10.1016/j.aquaculture.2019.734226.

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Orlov, A. A., V. D. Baron, and A. S. Golubtsov. "Electrogenesis in two african upside-down catfishes, Synodontis sorex and S. batensoda (Mochokidae, Siluriformes)." Доклады Академии наук 487, no. 6 (September 10, 2019): 711–14. http://dx.doi.org/10.31857/s0869-56524876711-714.

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Weak electric discharges generated by the two species of African upside-down catfishes, Synodontis sorex and S. batensoda, are described. In both species two types of discharges were recorded in the course of aggressive-defense interactions in the pairs of individuals: short simple biphasic and longer (duration > 20 ms) discharges with more complex waveform. The discharges of the latter type seem to result from a temporal summation (with various latency) of simple discharges. It is suggested that formation of the long quasimonopolar discharges enhances the coincidence of frequency spectrum of the catfish discharges with maximum sensitivity range of their ampullary electroreceptors.
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Ude, George N., David O. Igwe, Chrysten Brown, Myron Jackson, Alusine Bangura, Onyinye Ozokonkwo-Alor, Onyinye C. Ihearahu, et al. "DNA barcoding for identification of fish species from freshwater in Enugu and Anambra States of Nigeria." Conservation Genetics Resources 12, no. 4 (June 5, 2020): 643–58. http://dx.doi.org/10.1007/s12686-020-01155-7.

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Abstract Within Enugu and Anambra States, Nigeria, identification of fishes has been based on morphological traits and do not account for existing biodiversity. For DNA barcoding, assessment of biodiversity, conservation and fishery management, 44 fish sampled from Enugu and Anambra States were isolated, amplified and sequenced with mitochondrial cytochrome oxidase subunit I (COI). Twenty groups clustering at 100% bootstrap value including monophyletic ones were identified. The phylogenetic diversity (PD) ranged from 0.0397 (Synodontis obesus) to 0.2147 (Parachanna obscura). The highest percentage of genetic distance based on Kimura 2-parameter was 37.00 ± 0.0400. Intergeneric distances ranged from 15.8000 to 37.0000%. Congeneric distances were 6.9000 ± 0.0140–28.1000 ± 0.0380, with Synodontis as the existing synonymous genus. Confamilial distances in percentage were 16.0000 ± 0.0140 and 25.7000 ± 0.0300. Forty-two haplotypes and haplotype diversity of 0.9990 ± 0.0003 were detected. Nucleotide diversity was 0.7372, while Fu and Li’s D* test statistic was 2.1743 (P < 0.02). Tajima’s D was 0.2424 (P > 0.10) and nucleotide frequencies were C (17.70%), T (29.40%), A (24.82%), G (18.04%) and A + T (54.22%). Transitional mutations were more than transversions. Twenty species (99–100%) were identified with the e-value, maximum coverage and bit-score of 1e−43, 99–100 and 185–1194, respectively. Seventeen genera and 12 families were found and Clariidae (n = 14) was the most dominant among other families. The fish species resolution, diversity assessment and phylogenetic relationships were successfully obtained with the COI marker. Clariidae had the highest number of genera and families. Phylogenetic diversity analysis identified Parachanna obscura as the most evolutionarily divergent one. This study will contribute to fishery management, and conservation of freshwater fishes in Enugu and Anambra States, Nigeria.
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Bruwer, Erna E., and F. H. van der Bank. "Biochemical genetic markers (hybrizymes) to identify Synodontis zambezensis × S. nigromaculatus hybrids (Teleostei: Mochokidae)." Biochemical Systematics and Ecology 30, no. 7 (July 2002): 641–49. http://dx.doi.org/10.1016/s0305-1978(01)00134-x.

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28

Baron, V. D., K. S. Morshnev, V. M. Olshansky, and A. A. Orlov. "Electric organ discharges of two species of African catfish (Synodontis) during social behaviour." Animal Behaviour 48, no. 6 (December 1994): 1472–75. http://dx.doi.org/10.1006/anbe.1994.1387.

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Hiroshi, Nagaishi, Nishi Haruhisa, Fujii Ryozo, and Oshima Noriko. "Correlation between body color and behavior in the upside-down catfish, Synodontis nigriventris." Comparative Biochemistry and Physiology Part A: Physiology 92, no. 3 (January 1989): 323–26. http://dx.doi.org/10.1016/0300-9629(89)90571-9.

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30

Orlov, A. A., and V. D. Baron. "Responses of the Electrogeneration System of Synodontis (Mochokidae, Siluriformes) to Weak Electric Fields." Doklady Biological Sciences 403, no. 1-6 (July 2005): 284–87. http://dx.doi.org/10.1007/s10630-005-0113-y.

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31

oster, Nwachi, and Uzokiwe uche. "Acceptability Rate of Smoked and Electric Dried Synodontis Veremiculatus in the Niger Delta Region." IOSR Journal of Agriculture and Veterinary Science 7, no. 1 (2014): 07–10. http://dx.doi.org/10.9790/2380-07130710.

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32

Blake, R. W., and K. H. S. Chan. "Swimming in the upside down catfish Synodontis nigriventris: it matters which way is up." Journal of Experimental Biology 210, no. 17 (September 1, 2007): 2979–89. http://dx.doi.org/10.1242/jeb.006437.

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Shinkafi, B. A., and A. I. Daneji. "Morphology of the Gonads of Synodontis eupterus (Boulenger) from River Rima, North-western Nigeria." International Journal of Zoological Research 7, no. 6 (October 15, 2011): 382–92. http://dx.doi.org/10.3923/ijzr.2011.382.392.

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34

Orlov, A. A., V. V. Baron, and A. S. Golubtsov. "Electrogenesis in Two African Upside-Down Catfishes, Synodontis sorex and S. batensoda (Mochokidae, Siluriformes)." Doklady Biological Sciences 487, no. 1 (July 2019): 124–27. http://dx.doi.org/10.1134/s0012496619040100.

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35

Chan, K., J. Li, and R. Blake. "Swimming in the upside down catfish Synodontis nigriventris: It matters which way is up." Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 150, no. 3 (July 2008): S85—S86. http://dx.doi.org/10.1016/j.cbpa.2008.04.151.

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36

Lazarus, O. T., Godfrey C. Akani, Luca Luiselli, Nioking Amadi, Adaobi P. Ugbomeh, A. Osuamkpe, Daniele Dendi, et al. "Structure and diversity of fish communities in man-made ponds of the Niger Delta (southern Nigeria)." European Journal of Ecology 4, no. 2 (January 1, 2019): 84–91. http://dx.doi.org/10.2478/eje-2018-0015.

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Abstract 1. A survey of eight local earthen hand-dug ponds located within the freshwater swamps of a Niger Delta area (southern Nigeria) was conducted over a period of 3 months. A total of 4,313 fishes representing 19 species from 12 families were recorded. 2. The most abundant species was Xenomystus nigri (905 individuals), whereas the least common was Protopterus annectens (13). Cichlidae and Clariidae counted three species each, whereas Anabantidae, Hepsetidae, Mochokidae, Protopteridae, Phractolaemidae, Malapteruridae and Gymnarchidae were represented by a single species each. 3. A lotic species, Synodontis sp., was recorded possibly as a result of the episodic flood of 2012. 4. The Engenni swamps harbour a moderately diverse ichthyofauna. Regulations should be put in place to further enhance the fisheries potential of these local ponds.
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Inogwabini, Bila-Isia. "Fishes of the Salonga National Park, Democratic Republic of Congo: survey and conservation issues." Oryx 39, no. 1 (January 2005): 78–81. http://dx.doi.org/10.1017/s003060530500013x.

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Data were collected on the species richness and abundance of fishes at two sites in the Salonga National Park, Democratic Republic of Congo. Thirty species were identified out of a total of 1,180 fish caught. Claria buthupogon and Synodontis nigriventris (respectively 4.7 and 3.5 catches per net-night) were the most abundant species. Twenty-six other fish species were reported from interviews with local people. Conservation concerns are the burning of breeding sites, use of chemicals for fishing, and the newly introduced practice of dynamite fishing. The effects of these practices in the Park have yet to be documented, but it is likely that these fishing techniques are having negative effects on the fish fauna and urgent action is required to curb such activities, at least within the Park.
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Adaka, Godwin, Eunice Ndukwe, and Anthony Nlewadim. "Length-Weight Relationship of Some Fish Species in a Tropical Rainforest River in South-East Nigeria." Transylvanian Review of Systematical and Ecological Research 17, no. 2 (December 1, 2015): 73–78. http://dx.doi.org/10.1515/trser-2015-0065.

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Abstract The Length-Weight relationship of some fish species from Oramiri-Ukwa River, was studied from January to December, 2014. The slope (b) values obtained in the nine species ranged from 1.830 to 5.670 with most of the fishes indicating a negative allometric growth pattern except for Papyrocranus afer, with b value of 3.04, thus showing a positive isometric growth pattern. The following fish species showed a high degree of positive correlation at (P > 0.05); Ctenopoma kingselyae, Alestes imberi, Channa obscura, Oreochromis niloticus, Tilapia mariae, Tilapia zillii, Synodontis omais, and Papyrocranus afer. Chrysichthys auratus did not show this positive correlation. The condition factor (K) of the fish species ranged from 0.99 to 4.54, indicating that most of the fish were in good condition except for Chrysichthys auratus with 0.99.
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39

Lawal, N., and M. I. Nafiu. "A survey of fish fauna distribution and abundance in Gwaigwaye Reservoir Katsina State, Nigeria." Journal of Applied Sciences and Environmental Management 24, no. 12 (February 16, 2021): 2191–95. http://dx.doi.org/10.4314/jasem.v24i12.27.

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The study on a survey of fish fauna distributions and abundance in Gwaigwaye Reservoir, Katsina State was carried out from May 2013 to April 2014 to establish physical, chemical, and biological parameters (fish) of Gwaigwaye reservoir. Four sampling stations were selected. Some physico-chemical parameters were also determine to assess the level of pollution of the reservoir using standard methods and procedures which were correlated with the different fish species to determine fish abundance and distributions. Analysis of variance indicates no significant difference in fish fauna distribution and abundance among the four stations (P>0.05). The result indicated Fish fauna percentage composition were Tilapia zilli (17.32%), Clarias gariepinus (16.17%), Oreochromis niloticus (15.27%), Lates niloticus (13.80%), Bagrus. bayad (12.91%), Momyrus senegalensis (9.90%), Labeo senegalensis (7.41%) and Synodontis clarias (7.28%).
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Mekkawy, Imam A. A., and Arafa A. Hassan. "Some Reproductive Parameters of Synodontis Schall (Bloch and Schneider, 1801) from the River Nile, Egypt." Journal of Fisheries and Aquatic Science 6, no. 4 (June 15, 2011): 456–71. http://dx.doi.org/10.3923/jfas.2011.456.471.

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41

Olojo, E. A. A., N. A. Amusa, A. Osho, and V. O. Badejo. "Commensal Bacterial Flora of Synodontis nigrita and Clarias gariepinus from River Osun, Southwest Nigeria, Nigeria." Research Journal of Applied Sciences 5, no. 3 (March 1, 2010): 231–35. http://dx.doi.org/10.3923/rjasci.2010.231.235.

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42

Willoughby, N. G. "The buoyancy and orientation of the upside-down catfishes of the genus Synodontis (Pisces: Siluroidei)." Journal of Zoology 180, no. 3 (August 20, 2009): 291–314. http://dx.doi.org/10.1111/j.1469-7998.1976.tb04680.x.

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43

Friel, John P., and John P. Sullivan. "Synodontis woleuensis (Siluriformes: Mochokidae), a new species of catfish from Gabon and Equatorial Guinea, Africa." Proceedings of the Academy of Natural Sciences of Philadelphia 157, no. 1 (July 2008): 3–12. http://dx.doi.org/10.1635/0097-3157(2008)157[3:swsman]2.0.co;2.

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44

Pinton, Aurélie, Emmanuel Fara, and Olga Otero. "Spine anatomy reveals the diversity of catfish through time: a case study of Synodontis (Siluriformes)." Naturwissenschaften 93, no. 1 (October 29, 2005): 22–26. http://dx.doi.org/10.1007/s00114-005-0051-4.

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45

Mohamed, Elagba Haj Ali. "Characterization of two Synodontis (Siluriformes: Mochokidae) catfish species in the White Nile and Lake Nubia." Environmental Biology of Fishes 88, no. 1 (March 16, 2010): 17–23. http://dx.doi.org/10.1007/s10641-010-9585-1.

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46

Baron, V. D., and A. A. Orlov. "Electric Discharges in African Upside-Down Catfishes Synodontis (Mochokidae, Siluriformes): Peculiarities and Mechanisms of Electrogeneration." Journal of Ichthyology 61, no. 2 (March 2021): 293–98. http://dx.doi.org/10.1134/s0032945221020016.

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47

CAFFARA, MONICA, SEAN A. LOCKE, PAUL C. ECHI, ALI HALAJIAN, DEBORAH BENINI, WILMIEN J. LUUS-POWELL, SAREH TAVAKOL, and MARIA L. FIORAVANTI. "A morphological and molecular study of Clinostomid metacercariae from African fish with a redescription of Clinostomum tilapiae." Parasitology 144, no. 11 (June 27, 2017): 1519–29. http://dx.doi.org/10.1017/s0031182017001068.

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SUMMARYThe genus Clinostomum Leidy, 1856 (Digenea: Clinostomidae) has been reported in all ecozones of the world and a clear separation between the species of the ‘Old World’ and ‘New World’ has been recognized based on molecular studies. Recent works on Afrotropical species include redescriptions of C. cutaneum and C. phalacrocoracis, while C. tilapiae has yet to be studied using modern taxonomic approaches. In the present research, morphological redescription of C. tilapiae metacercariae from a new host, Synodontis batensoda sampled at Anambra River Basin, Nigeria, together with molecular analysis of nuclear internal transcribed spacer rDNA and cytochrome c oxidase 1 mtDNA are reported. We also provide morphological and molecular data from four further putative species of Clinostomum (morphotypes 1–4) from different areas of Africa, as well as the first report of C. phalacrocoracis in South Africa.
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Орлов, А., В. Барон, and А. Голубцов. "ЭЛЕКТРИЧЕСКИЕ РАЗРЯДЫ И ОСОБЕННОСТИ ЭЛЕКТРОГЕНЕЗА У АФРИКАНСКИХ ПЕРИСТОУСЫХ СОМОВ SYNODONTIS CAUDOVITTATUS И S. EUPTERUS (MOCHOKIDAE, SILURIFORMES)." Доклады Академии наук, no. 5 (2017): 649. http://dx.doi.org/10.7868/s0869565217050267.

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49

Aghoghovwia, Ogaga Augustine, and Tari Timothy Edike. "Heavy Metal Concentrations in the Tissues of Synodontis Membranaceous along Lower Taylor Creek, Bayelsa State Nigeria." IOSR Journal of Humanities and Social Science 19, no. 3 (2014): 67–70. http://dx.doi.org/10.9790/0837-19326770.

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50

Ohnishi, Ken, Akihisa Takahashi, Hiroaki Tanaka, and Takeo Ohnishi. "Relationship between frequency of upside-down posture and space size around upside-down catfish, Synodontis nigriventris." Biological Sciences in Space 10, no. 4 (1996): 247–51. http://dx.doi.org/10.2187/bss.10.247.

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