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Journal articles on the topic 'Densité larvaire'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Iro, Souleymane Mahamane, Yaro Alpha Seydou, and Ali Doumma. "Mesures des indicateurs de prolifération des larves de moustiques au niveau des mares permanentes et semi permanentes de Saga, Niger." International Journal of Biological and Chemical Sciences 14, no. 4 (2020): 1188–202. http://dx.doi.org/10.4314/ijbcs.v14i4.3.

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Les Culicidae, communément appelés moustiques, par leur large distribution et leur abondance, sont impliqués dans la transmission de nombreuses maladies humaines et animales. La lutte contre ces insectes nécessite la connaissance de leurs lieux de développement dans lequel évoluent les stades pré imaginaux. La présente étude vise à caractériser ces gîtes larvaires en vue d’identifier les indicateurs entomologiques et écologiques de production de larves dans ces milieux. Pour ce faire, le pH, la température, la conductivité, la teneur en oxygène dissout et la densité larvaire des culicidae ont

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Dianti, Isye, Budiyono Budiyono, and Tri Joko. "Nutrition Factors in Breeding Place Media and Larva Density of Aedes Aegypti." Journal of Public Health for Tropical and Coastal Region 2, no. 2 (2019): 33–39. http://dx.doi.org/10.14710/jphtcr.v2i2.6188.

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Background: One of the stages of development to the growth of the Aedes aegypti is larvae stage. The larvae need nutrients to grow. A one of medium for breeding larvae is water in the container. Some of the important nutrients for growth are nitrate, phosphate, ammonia. This study aimed to analyze the relationship between nutrient levels in the water of the container density of Aedes aegypti larvae. Methods: Observational study with a cross-sectional with 119 houses as samples. Results:Test the relationship of nutritional factors with the density of Aedes aegypti larvae using the Pearson corre

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Motta, Jonas H. S., Leonardo S. Glória, Marcelo F. Polese, André B. De Souza, Manoel A. C. Neto, and Manuel V. Vidal Júnior. "Stocking density influences common carp larval development. Can restocking processes activate compensatory growth consequent to previous high stocking density?" Spanish Journal of Agricultural Research 18, no. 3 (2020): e0608. http://dx.doi.org/10.5424/sjar/2020183-15652.

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Aim of study: to analyse the effect of stocking density on common carp larvae production. Since stocking density is one of the most important variables in recirculating aquaculture system, it is fundamental to understand its implication on fish larval development. Area of study: BrazilMaterial and methods: In an initial trial over a 30-day period, 18,000 Cyprinus carpio larvae were subjected to eight different stocking densities (5, 10, 15, 20, 25, 30, 35 and 40 larvae/L). In a second trial over a 15-day period, the larvae subjected to the 40 larvae/L treatment were selected according to size

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Cardoso-Leite, Ricardo, Gabriel C. Vilardi, Rhainer Guillermo-Ferreira, and Pitágoras C. Bispo. "The Effect of Conspecific Density on Emergence ofLestes bipupillatusCalvert, 1909 (Odonata: Lestidae)." Psyche: A Journal of Entomology 2014 (2014): 1–3. http://dx.doi.org/10.1155/2014/650427.

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Conspecific density may influence adult recruitment and consequently population dynamics. Several studies have shown the density dependence of larvae growth rates in Odonata. However, few studies studied how conspecific density influence final instar larvae emergence date decisions. Considering that larvae may choose the date of emergence, the present study investigated if density affects larvae choice. For this, we reared eight final instar larvae in individual aquaria and other 24 larvae in aquaria with three larvae each. This way, we simulated environments with low and high larval densities

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Yamasaki Granados, Stig, Marcelo Garcia Guerrero, Fernando Vega Villasante, Francisco Castellanos Leon, Ronaldo O. Cavalli, and Edilmar Cortes Jacinto. "Experimental culture of the river prawn Macrobrachium americanum larvae (Bate, 1868), with emphasis on feeding and stocking density effect on survival." Latin American Journal of Aquatic Research 41, no. 4 (2013): 793–800. http://dx.doi.org/10.3856/vol41-issue4-fulltext-16.

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Mariana, Santi, I. Wayan Susila, Ketut Ayu Yuliadhi, and I. Wayan Supartha. "The response of sycanus aurantiacus ishikawa et okajima (hemiptera: reduviidae) to color polymorphisms larvae of spodoptera exigua (hubner) (lepidoptera: noctuidae)." International journal of life sciences 4, no. 2 (2020): 42–51. http://dx.doi.org/10.29332/ijls.v4n2.438.

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his study aims to evaluate the predatory behavior, preference and functional response of S. aurantiacus in color polymorphism larvae of S. exigua. The predatory behavior and preference test of S. aurantiacus using green and dark brown color larvae of S. exigua. Functional response test was carried out with 5 treatments of larvae population density with 10 replications. The results showed that S. aurantiacus prefers to dark brown larvae of S. exigua than green. The time taken by predators to find the first and subsequent prey was faster in dark brown larvae than in green, both on low or high la

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Castelo Branco, Marina, and Alexander G. Gatehouse. "Food availability and larval density affect ovarian development in Plutella xylostella (L.) (Lepidoptera: Yponomeutidae)." Anais da Sociedade Entomológica do Brasil 28, no. 4 (1999): 611–16. http://dx.doi.org/10.1590/s0301-80591999000400004.

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The effect of Diamondback Moth (Plutella xylostella L.) population density and plant age on the rate of ovarian development was investigated. In tests carried out in Petri dishes, the density of larvae/leaf disk affected the rate of ovarian development. A high proportion of moths from larvae reared on leak disks from two or four-month-old spring cabbage at a density of seven or 14 larvae/leaf disk were mature at emergence. But moths reared at the same type of plant at a density of 28 larvae/leaf disk were largely immature at emergence. When the larvae were reared at a density of 30 larvae/plan

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Kong, Hailong, Chuanlei Dong, Wanghui Jing та ін. "The Role of Tyramine β-Hydroxylase in Density Dependent Immunityof Oriental Armyworm (Mythmina separata) Larva". International Journal of Molecular Sciences 20, № 7 (2019): 1553. http://dx.doi.org/10.3390/ijms20071553.

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High population density alters insect prophylactic immunity, with density-dependent prophylaxis (DDP) being reported in many polyphonic insects. However, the molecular mechanism for DDP remains unclear. In current study, the role of tyramine β-hydroxylase (Tβh) in the immune response of M. separata larvae that were subject to different rearing densities conditions was investigated. The tyramine β-hydroxylase activity of larvae from high density treatments (10 and 30 larvae per jar) was significantly higher than that of the larvae from low density treatments (one, two, and five larvae/jar). A t

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Sunarti, Sunarti, Muhammad Ali, and Mudatsir Mudatsir. "Kepadatan Fitoplankton dan Larva Nyamuk Aedes albopictus pada Tempat Perindukan di Kecamatan Syiah Kuala Kota Banda Aceh." BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan 6, no. 2 (2019): 125. http://dx.doi.org/10.22373/biotik.v6i2.5634.

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This study was conducted to determine the density index of phytoplankton and Aedes albopictus larvae found in breeding sites. The object of research was phytoplankton and Aedes albopictus larvae taken at Syiah Kuala District, Banda Aceh. Data was collected in December 2014 and January 2015. This study used a descriptive exploratory design. The research parameters are the type and density of phytoplankton found in various breeding places found at the study site. Data on the density of Aedes albopictus larvae was analyzed using the House and Container Index, and Density Index. This study found 1

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Prastiani, Ika, and Corie Indria Prasasti. "Relationship between Temperature, Density Residential, Knowledge, Attitude with Density of Larvae in Sub District Gunung Anyar, Surabaya." JURNAL KESEHATAN LINGKUNGAN 9, no. 1 (2018): 1. http://dx.doi.org/10.20473/jkl.v9i1.2017.1-10.

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Dengue Hemorrhagic Fever (DHF) is a disease caused by dengue virus and transmitted by mosquito Aedes. Surabaya is one of the districts in East Java Province which includes dengue endemic areas, particularly in Sub district Gunung Anyar. The purpose of this study was analyze relationship between temperature, density residential, knowledge and attitude about the incidence and the intervention of dengue with the density of larvae Aedes aegypti in Sub district Gunung Anyar, Surabaya. This study was an observational study with cross sectional study design that used primary data like observation, in

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Saepudin, Malik, Soeharyo Hadisaputro, Ari Suwondo, and Suhartono Suhartono. "The Effect of Rekattidiri Ovitrap towards Aedes aegypti Larval Density." International Journal of Public Health Science (IJPHS) 6, no. 1 (2017): 78. http://dx.doi.org/10.11591/ijphs.v6i1.6536.

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Dengue Hemorrhagic Fever (DHF) is a health problem in Indonesia. The entire region of Indonesia at risk of contracting dengue disease. The study aims to prove the effect of modifications ovitrap rekattidiri on the density of larvae (HI: House Index, CI: Container Index and BI: Breteu Index) as well as comparing the differences between the mean larvae trapped between ovitrap Rekattidiri with standard ovitrap. Using a quasi experimental design, time series experimental design with Control group. Population subjects were Aedes aegypti at the endemic sites in Pontianak, West Borneo. The results sh

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Saepudin, Malik, Soeharyo Hadisaputro, Ari Suwondo, and Suhartono Suhartono. "The Effect of Rekattidiri Ovitrap towards Aedes aegypti Larval Density." International Journal of Public Health Science (IJPHS) 6, no. 1 (2017): 80. http://dx.doi.org/10.11591/.v6i1.6536.

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Dengue Hemorrhagic Fever (DHF) is a health problem in Indonesia. The entire region of Indonesia at risk of contracting dengue disease. The study aims to prove the effect of modifications ovitrap rekattidiri on the density of larvae (HI: House Index, CI: Container Index and BI: Breteu Index) as well as comparing the differences between the mean larvae trapped between ovitrap Rekattidiri with standard ovitrap. Using a quasi experimental design, time series experimental design with Control group. Population subjects were Aedes aegypti at the endemic sites in Pontianak, West Borneo. The results sh

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13

Wang, Yiming, Robert L. Harrison, and Juan Shi. "Effects of Rearing Density on Developmental Traits of Two Different Biotypes of the Gypsy Moth, Lymantria Dispar L., from China and the USA." Insects 12, no. 2 (2021): 175. http://dx.doi.org/10.3390/insects12020175.

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The life-history traits of the gypsy moth, Lymantria dispar L. (Lepidoptera: Erebidae), have been observed to vary with larval population density, which can increase significantly during an outbreak of this pest. Laboratory studies on density-dependent variation in gypsy moth development have focused on single populations and were limited to comparing solitary larvae with groups of larvae reared at a single density. To evaluate how density-dependent impacts on development vary with different populations and subspecies of L. dispar, we compared the effects of rearing larvae of a European gypsy

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Baker, Robert L. "Food Limitation of Larval Dragonflies: A Field Test of Spacing Behaviour." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 9 (1986): 1720–25. http://dx.doi.org/10.1139/f86-215.

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Density-dependent growth and survival of larval odonates may result from some larvae excluding others from profitable hunting sites. This hypothesis predicts that both degree and variation in food limitation should increase with population density; it also suggests that large larvae should show less food limitation than small larvae. I tested these predictions by analyzing food limitation, determined by mass of fecal pellets, and population density of larval Ischnura verticalis and Enallagma ebrium from a pond in southern Ontario. When data from all sampling days were combined, population dens

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15

Asmani, Katia, Bruno Petton, Jacqueline Le Grand, Jérôme Mounier, René Robert, and Jean-Louis Nicolas. "Determination of stocking density limits for Crassostrea gigas larvae reared in flow-through and recirculating aquaculture systems and interaction between larval density and biofilm formation." Aquatic Living Resources 30 (2017): 29. http://dx.doi.org/10.1051/alr/2017023.

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The first aim of this study was to determine the stocking density limits for Pacific oyster Crassostrea gigas larvae reared in flow-through system (FTS) and recirculating aquaculture systems (RAS). The second aim was to examine biofilm formation on the larval tank wall and its interaction with larvae growth. Three larvae concentrations were tested: 50, 150, and 300 mL−1. Chemical parameters and larvae performance were measured. The biofilm was observed by scanning electron microscopy, and its bacterial composition was investigated by pyrosequencing analysis of part of the 16S rRNA gene. The hi

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Kong, Hailong, Zhonglin Liu, Pingjun Yang, et al. "Effects of Larval Density on Plutella xylostella Resistance to Granulosis Virus." Insects 11, no. 12 (2020): 857. http://dx.doi.org/10.3390/insects11120857.

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It has been reported that some phase-polyphenic insects from high-density conditions are more resistant to pathogens than those from low-density conditions. This phenomenon is termed “density-dependent prophylaxis” (DDP). However, whether non phase-polyphenic insects exhibit DDP has rarely been elucidated. The diamondback moth (DBM), Plutella xylostella, one of the most destructive insect pests affecting cruciferous crops, is non phase-polyphenic. In this study, the resistance of DBM larvae to P. xylostella granulosis virus (Plxy GV) and their immune response to the virus when reared at densit

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17

Iwan, Suryadi. "Habitat characteristics with an. barbirostris larva density in Bulukumba." E3S Web of Conferences 73 (2018): 06019. http://dx.doi.org/10.1051/e3sconf/20187306019.

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Bulukumba is a malaria endemic area in South Sulawesi with malaria cases reported annually, An.barbirostris as a potential vector of malaria in the area. This study aims to analyze habitat characteristics with a density of An. barbirostris larvae The method used is an observational study with ecological survey design through the cross-sectional approach of samples in the form of Anopheles larvae habitat. Bivariate analysis shows physical, chemical, and biological environmental factors. water temperature significant to the density of larva An.barbirostris with p-value = 0,002. Multivariate test

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18

Gehrke, PC. "Avoidance of inundated floodplain habitat by larvae of golden perch (Macquaria ambigua Richardson): Influence of water quality or food distribution?" Marine and Freshwater Research 42, no. 6 (1991): 707. http://dx.doi.org/10.1071/mf9910707.

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Golden perch (Macquaria ambigua) larvae were studied in a pond and an adjoining inundated floodplain to determine the influence of water quality and prey density on larval dispersion. Mean catches in both pump and light-trap samplers were greatest at midnight (4.08 and 11.58 larvae per sample, respectively), with relatively few larvae caught at dawn, midday and dusk. A total of 1421 larvae were collected in 320 samples from the pond (4.4 larvae per sample), whereas only 354 larvae were caught in 480 samples (0.7 larvae per sample) from the floodplain. Neither total plankton density nor the den

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Bickerton, Matthew W., Joseph Corleto, Thomas N. Verna, Eric Williges, and Deepak Matadha. "Comparative Efficacy of Pimephales promelas, Fundulus diaphanus, and Gambusia affinis and Influence of Prey Density for Biological Control of Culex pipiens molestus Larvae." Journal of the American Mosquito Control Association 34, no. 2 (2018): 99–106. http://dx.doi.org/10.2987/17-6718.1.

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ABSTRACT Larval survival times and density-dependent feeding behavior were evaluated with the use of 2 species of fish native to the northeastern USA (Pimephales promelas and Fundulus diaphanus), and the potentially invasive Gambusia affinis. Each species was provided 10, 20, 30, 45, and 60 4th-stage larvae of Culex pipiens molestus/fish in the laboratory and digital images were recorded to quantify the number of surviving larvae at various intervals. Daily feeding rates were greatest at the highest larval density. These were 49.69 ± 4.07 larvae for P. promelas, 60 larvae for F. diaphanus, and

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Long, D. B. "EFFECTS OF POPULATION DENSITY ON LARVAE OF LEPIDOPTERA1." Transactions of the Royal Entomological Society of London 104, no. 15 (2009): 543–85. http://dx.doi.org/10.1111/j.1365-2311.1953.tb01247.x.

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Berggreen, I. E., J. Offenberg, M. Calis, and L. H. Heckmann. "Impact of density, reproduction period and age on fecundity of the yellow mealworm Tenebrio molitor (Coleoptera: Tenebrionidae)." Journal of Insects as Food and Feed 4, no. 1 (2018): 43–50. http://dx.doi.org/10.3920/jiff2017.0013.

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The impact of adult density, reproduction period (days in the same container) and age on reproduction of Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae) were studied. Data were analysed as total number of larvae in each container (38 cm2) and as daily reproduction per capita. The study was divided in two experiments. Experiment 1 examined the influence of four densities (0.11, 0.21, 0.42 and 0.84 beetles/cm2) and five reproduction periods (1, 2, 3, 4 and 6 days) on reproduction. Experiment 2 examined the effect of age (30-92 days) and three densities (0.11, 0.21 and 0.32 beetles/cm2) on

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SILVA, EMÍLIA TATIANE LOPES DA, MARCELO MATTOS PEDREIRA, GUILHERME DE SOUZA MOURA, DAIANE KELLY ALVES PEREIRA, and CARLOS JOSÉ OTONI. "LARVAL CULTURE OF NILE TILAPIA LINEAGES AT DIFFERENT STORAGE DENSITIES." Revista Caatinga 29, no. 3 (2016): 709–15. http://dx.doi.org/10.1590/1983-21252016v29n322rc.

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ABSTRACT Larvae from two Nile tilapia (Oreochromis niloticus) lineages were subjected to different storage densities. An experiment was conducted arranged in a 4 x 2 factorial scheme, four storage densities (6.25, 12.50, 18.75 and 25.00 larvae L-1) and two lineages (GIFT and Thai). Larvae from the lineage GIFT and Thai (4,000) were distributed in 32 aquariums with 8 liters of water each, in a randomized order with four replications. The larvae were maintained in the aquariums with constant aeration and natural photoperiod for 36 days. Limnological variables were within the proper range to the

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Ilijin, Larisa, Milena Vlahovic, Marija Mrdakovic, et al. "Activity of gypsy moth dorsolateral neurosecretory neurons under increased rearing density." Archives of Biological Sciences 64, no. 3 (2012): 1085–92. http://dx.doi.org/10.2298/abs1203085i.

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Lymantria dispar caterpillars were reared under two different rearing densities for the first three days of the 4th larval instar: 5 larvae that were kept in a Petri dish (V = 80 ml) belonged to the intense stress (D1 group); 5 larvae that were kept in a plastic cup (V = 300ml) belonged to the group exposed to less intense stress (D2 group). In the control group, single larvae were reared in a Petri dish. Morphometric changes in L1, L2 and L2? dorsolateral neurosecretory neurons (nsn) were analyzed. After keeping 5 larvae in a Petri dish, the size of L2 neurosecretory neurons (nsn) significant

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Mappau, Zrimurti, Siti Rahmah, and Ridhayani Adiningsih. "SURVEY KEPADATAN LARVA AEDES AEGYPTI DI KECAMATAN MAMUJU KABUPATEN MAMUJU." Jurnal Kesehatan Manarang 2, no. 2 (2016): 99. http://dx.doi.org/10.33490/jkm.v2i2.23.

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Aedes aegypti is a vector of dengue fever. Vector density may be effect of disease incidence because of the high density and highly resistant to increase of the disease. Larvae density in an area influenced by availabiloty of kontainers. The objective of this study to determine of larvae density of Aedes aegypti mosquito in endemic and non endemic area in Mamuju District based on House Index value, Kontainer Index value, Breteau Index value, and Density Figure level. We did observasional study with cross sectional by collected data and observation to larvae density of Aedes aegypti in its kont

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Ndiki, Helen, Apris A. Adu, and Ribka Limbu. "Survei Jentik Nyamuk Anopheles di Desa Maukeli Kecamatan Mauponggo." Media Kesehatan Masyarakat 2, no. 1 (2020): 10–17. http://dx.doi.org/10.35508/mkm.v2i1.1948.

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Malaria is an infectious disease caused by the parasitic plasmodium protozoan parasite. This disease is transmitted through female Anopheles sp mosquito bites. Anopheles mosquito breeding sites can be in the form of fresh water or salt water, ponds that are overgrown with aquatic plants or those that do not plant, rice fields, river mouths where the flow is not swift and small pools filled with rainwater. Maukeli Village is a village that has a lot of rice fields. The purpose of this study was to determine the density of Anopheles mosquito larvae at various breeding places in Maukeli Village,

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Isnawati, Isnawati, Bambang Widjanarko Otok, Suharto Suharto, and Arief Wibowo. "Structural Equation Modeling Based on Variance The Density Index of Larvae of The Rainy Season in the City of Banjarbaru." CAUCHY 5, no. 3 (2018): 127. http://dx.doi.org/10.18860/ca.v5i3.5877.

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Climate change causes changes rainfall, temperature, air humidity and wind direction so that affect the reproduction of vectors of diseases such as the mosquito <em>Aedes</em>, <em>Malaria</em>, etc. that it needs to be monitored the increase in many cases DB. free number of larvae (<em>ABJ</em>) is one of the larva density indicator, although <em>ABJ</em> has more than 90 percent but morbidity remains high. The condition of the <em>ABJ</em> not describes the density of larvae jentik, so that the need to study the density jentik indic

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Romimohtarto, Kasijan, and Okto Haryanto Arinardi. "STUDIES ON THE DISTRIBUTION OF BARNACLE LARVAE AND THE BARNACLE FOULING IN THE ESTUARINE AREA OF MUARA KARANG." Marine Research in Indonesia 20 (May 10, 2018): 19–36. http://dx.doi.org/10.14203/mri.v20i0.380.

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Estuary hosts many of the meroplanktonic lives of marine animals, among which are the barnacles. The study of the seasonal abundance of the barnacle larvae and of the barnacle attachments at Muara Karang during 1975-1976 indicated that barnacle larvae and barnacle attachments occurred throughout the year. However, certain peaks of the larvae abundance and the high densities of attachment were found in certain months of the year. The peaks of larvae distribution were observed in April 1975, June 1975, September 1975, and January 1976. In general the density of the attached barnacles on panels w

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Battisti, Eduardo Kelm, Adelita Rabaioli, Luiza Beatriz Hermes, Fernando Jonas Sutili, and Rafael Lazzari. "Growth and survival of silver catfish (Rhamdia quelen) post-larvae reared at different stocking densities in a biofloc system." Revista Agraria Academica 4, no. 2 (2021): 95–100. http://dx.doi.org/10.32406/v4n2/2021/95-100/agrariacad.

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Biofloc technology (BFT) is an approach in aquaculture that has gained much interest and is currently widely being studied and applied. In this study, silver catfish (Rhamdia quelen) post-larvae were reared in a BFT system, at different stocking densities (10, 20, 30 and 40 post-larvae/L), for 21 days. After two weeks, fish larvae subjected to the higher stoking density showed greater weight gain. At the end of the trial (21 days), no relevant differences between treatments were observed related to growth parameters. However, post-larvae reared at the stocking density of 20 post-larvae/L prese

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Zakiyabarsi, Furqan, Muhammad Niswar, and Zahir Zainuddin. "Crab Larvae Counter Using Image Processing." EPI International Journal of Engineering 2, no. 2 (2019): 127–31. http://dx.doi.org/10.25042/epi-ije.082019.06.

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Very small larval size, high mortality rate of crab larvae, the absence of an accurate crab larva counter at affordable price, the density of larvae that are not known accurately, the ratio of feed that not in accordance with the number of larvae to damage water quality and cannibalism, water quality can not be adjusted to the density of distribution, and economically unprofitable both in terms of feed efficiency and buying and selling transactions. By knowing the number of crab larvae accurately the survival rate of crab larvae increases and is economically beneficial. In this study larvae co

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Gao, Shang-kun, Cui-cui Geng, Ying-chao Ji, Zi-kun Li, and Cheng-gang Zhou. "Density-Dependent Growth and Fitness in Dastarcus helophoroides (Coleoptera: Bothrideridae)." Insects 10, no. 11 (2019): 386. http://dx.doi.org/10.3390/insects10110386.

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The ectoparasitoid Dastarcus helophoroides Fairmaire (Coleoptera: Bothrideridae) is an important natural enemy insect, which is artificially mass-reared and released into woodland to control medium and large longhorn beetle species. This study examined the developmental duration (days) of larvae and adult fitness (including numbers of adults emerging per host and mean body size) by exposing a single substitute host, a pupa of Zophobas morio (Coleoptera: Tenebrionidae), to different densities of D. helophoroides larvae. We showed that there was no significant effect on the rate of successful pa

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Trotter, A. J., S. C. Battaglene, and P. M. Pankhurst. "Buoyancy control and diel changes in swim-bladder volume in cultured striped trumpeter (Latris lineata) larvae." Marine and Freshwater Research 56, no. 4 (2005): 361. http://dx.doi.org/10.1071/mf04209.

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Body density, swim-bladder volume, buoyant force and feeding in relation to growth, photoperiod and light intensity were investigated in cultured striped trumpeter larvae. Prior to initial swim-bladder inflation, body density was negative during both the light and dark phases, regulated on a diel cycle from 1.0275 to 1.0290 g cm−3 (seawater: 1.0265 g cm−3). After initial swim-bladder inflation, body density decreased markedly during the dark phase as swim-bladder volume increased on a diel cycle. Downward buoyant force from dry matter increased with age and was compensated for by increasing re

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Saraswati, Saraswati, Agus Hartoko, and Sasanti Retno Suharti. "HUBUNGAN KERAPATAN LAMUN DENGAN KELIMPAHAN LARVA IKAN DI PULAU PRAMUKA, KEPULAUAN SERIBU JAKARTA." Management of Aquatic Resources Journal (MAQUARES) 5, no. 3 (2016): 111–18. http://dx.doi.org/10.14710/marj.v5i3.14397.

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ABSTRAKStadia larva merupakan fase awal daur kehidupan bagi ikan. Larva adalah biota perairan yang bersifat planktonik dan termasuk kedalam jenis meroplankton. Ekosistem Padang Lamun di Pulau Pramuka memiliki fungsi ekologis yang cukup penting di wilayah pesisir, dimana ekosistem ini merupakan salah satu daerah asuhan dan daerah mencari makan bagi larva ikan. Adanya perbedaan tingkat kerapatan lamun dan keberadaan makanan dapat memberikan pengaruh terhadap kelimpahan larva ikan. Sehingga hal tersebut menjadi landasan dilakukannya penelitian mengenai Hubungan Kerapatan Lamun Terhadap Kelimpahan

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Stejskal, Vlastimil, Jan Matousek, Roman Sebesta, Joanna Nowosad, Mateusz Sikora, and Dariusz Kucharczyk. "Stocking density effect on survival and growth of early life stages of maraena whitefish, Coregonus maraena (Actinopterygii: Salmoniformes: Salmonidae)." Acta Ichthyologica et Piscatoria 51, no. 2 (2021): 139–44. http://dx.doi.org/10.3897/aiep.52.64119.

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The maraena whitefish, Coregonus maraena (Bloch, 1779), is often considered a suitable candidate for intensive aquaculture diversification in the EU. However, only a few such farms in Europe are in operation. Rearing this species in recirculating aquaculture systems is a recent innovation, and optimisation is necessary to standardise aspects of larviculture. This 30-day study investigated the effect of stocking densities of 25/L, 50/L, 100/L, and 200/L on the survival and growth of maraena whitefish larvae in a recirculating aquaculture system. The four groups of larvae (initial weight = 7.4 ±

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Suresh Kesti, Sheetal, and Shivasharana Chandrabanda Thimmappa. "First report on biodegradation of low density polyethylene by rice moth larvae, Corcyra cephalonica (stainton)." Holistic approach to environment 9, no. 4 (2019): 79–83. http://dx.doi.org/10.33765/thate.9.4.2.

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Corcyra cephalonica (Stainton), rice moth larvae were used for biodegradation of low density polyethylene (LDPE). The role of larval gut microorganisms in LDPE biodegradation was studied by force feeding the larvae with a cocktail of antibiotic solution. After force feeding, the larvae were left in contact with LDPE films. Larvae which were unfed with antibiotic solution were used as controls. Degradation rate was checked by measuring the weight loss after 20 day period of contact with LDPE films in insect rearing bottles. The DNA of both antibiotic fed and unfed larvae was isolated. There was

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Suryadi, Iwan, Hasanuddin Ishak, and Darmawansyah. "Spatial and Temporal Distribution and Environmental Factors Related to Larval Density An. Barbirostris and An. Subpictus in Bulukumba: an Approach to Industry 4.0." E3S Web of Conferences 125 (2019): 05002. http://dx.doi.org/10.1051/e3sconf/201912505002.

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Characteristics of breeding site anopheles, sp supports the solidity of larvae An. barbirostris and An. subpictus . Purpose this study to analyzing Breeding place characteristics with the solidity of larvae An. barbirostris and An. subpictus and know spatially the distribution of Anopheles larvae in Bulukumba. The procedure with ecological survey design and the cross-sectional. Population and sample were breeding sites around the houses of malaria sufferers. Data were analyzed by the application of Statistical Product and Service Solution and Arc Gis 10.1. The spatial distribution shows that t

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Sutherst, RW, LJ Wilson, R. Reid, and JD Kerr. "A survey of the ability of tropical legumes in the genus Stylosanthes to trap larvae of the cattle tick, Boophilus microplus (Ixodidae)." Australian Journal of Experimental Agriculture 28, no. 4 (1988): 473. http://dx.doi.org/10.1071/ea9880473.

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Stylosanthes viscosa and S. scabra cvv. Fitzroy and Seca have previously been shown to trap host-seeking larvae of the cattle tick Boophilus microplus and could provide a means of controlling cattle ticks in improved pastures. We assessed the ability of 229 accessions from 22 species of the genus Stylosanthes to trap larvae of B. microplus or to prevent them from ascending plant stems. The 3 species that were most effective were S. viscosa, S. scabra and S. guianensis. Only accessions which produced sticky secretions were able to trap tick larvae, but the extent of this ability was related pri

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Siahaan, Sondang, and Rina Fauziah. "Studi Kepadatan Jentik Nyamuk di Kelurahan Tebing Tinggi Kecamatan Tebing Tinggi Kabupaten Tanjung Jabung Barat Jambi Tahun 2019." Jurnal Ilmiah Universitas Batanghari Jambi 20, no. 1 (2020): 302. http://dx.doi.org/10.33087/jiubj.v20i1.865.

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Mosquitoes have a very important meaning in the health sector because of their role as vectors of various diseases. Diseases transmitted by mosquitoes include dengue fever, malaria and filariasis. These three diseases are transmitted from one person to another through vector intermediaries. Vector is a creature that acts as an intermediary for transmitting diseases. Tebing Tinggi Village is a densely populated area. The density of the population as well as the constraints of clean water make a lot of water reservoirs to store daily water needs. This can potentially be a breeding ground for mos

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Yazarel, Serkan, Şenay Sarıca, and Sedat Karaman. "EFFECTS OF FERMENTED MEALWORM LARVAE MEAL WITH DIFFERENT PROBIOTICS ON LITTER QUALITY IN BROILER HOUSE." Current Trends in Natural Sciences 10, no. 19 (2021): 282–87. http://dx.doi.org/10.47068/ctns.2021.v10i19.036.

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This study was conducted to investigate the effects of the supplementation of fermented mealworm larvae meal with two different probiotic bacteria (Lactobacillus plantarum or Lactobacillus brevis) to diets of broilers reared normal or high stocking density on litter quality. Wood shavings, commonly used in broiler houses, are used as litter material. High stocking density significantly increased litter moisture content compared to that of broiler reared normal stocking density (P<0.0001). Dietary supplementing of fermented mealworm larvae meal with Lactobacillus plantarum or Lactobacillus b

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Skorping, Arne. "The effect of density of first-stage larvae of Elaphostrongylus rangiferi on the infection rate in the snail intermediate host." Parasitology 96, no. 3 (1988): 487–92. http://dx.doi.org/10.1017/s0031182000080124.

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SUMMARYThe relationship between the density of lst-stage larvae of Elaphostrongylus rangiferi on the infection rate into the gastropod intermediate host, Arianta arbustorum, was studied experimentally. Within a range of densities between 30 and 1100 larvae/cm2 the experimental data gave a good fit to the conventional epidemiological assumption of direct proportionality between the net infection rate and the density of infective stages. The instantaneous rate of infection was estimated to be about 1 × 10−3/larvae/snail/2 h. At higher densities (> 1100 larvae/cm2) the instantaneous rate of in

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Kerans, B. L., Peter L. Chesson, and Roy A. Stein. "Assessing density-dependent establishment and dispersal: an example using caddisfly larvae." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 6 (2000): 1190–99. http://dx.doi.org/10.1139/f00-047.

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Density dependence in colonization is poorly understood. We studied colonization by a benthic, stream-dwelling caddisfly, Hydropsyche slossonae, through experiments varying conspecific densities and environmental conditions. A model of larval acceptance or rejection of a locality (dispersal from the locality) was developed and fitted to the data to estimate the relative strengths of density-dependent and density-independent processes underlying dispersal. In spring and fall, we varied density, substrate size, and current velocity in laboratory experiments and varied density in field experiment

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Hanes, Elizabeth C., and Jan J. H. Ciborowski. "Effects of density and food limitation on size variation and mortality of larval Hexagenia rigida (Ephemeroptera: Ephemeridae)." Canadian Journal of Zoology 70, no. 9 (1992): 1824–32. http://dx.doi.org/10.1139/z92-249.

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Natural populations of the burrowing mayfly belonging to the genus Hexagenia are characterized by unusually broad size-frequency distributions. Environmental features are often invoked to explain among-populations growth differences. We used a 4 × 4 factorial design to investigate differences in mean larval size and mortality of Hexagenia reared at different densities and food levels over four time intervals (30, 60, 90, and 120 d) in the laboratory. Larvae were hatched from eggs collected from imagoes at the Detroit River near Windsor, Ontario. Although neither density nor food limitation inf

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Bunnell, David B., María J. González, and Roy A. Stein. "Zooplankton biomass enhances growth, but not survival, of first-feeding Pomoxis spp. larvae." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 11 (2003): 1314–23. http://dx.doi.org/10.1139/f03-112.

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We used otoliths to estimate growth and survival of white (Pomoxis annularis) and black (Pomoxis nigromaculatus) crappie larvae in five Ohio reservoirs. Because Pomoxis spp. larvae are among the smallest freshwater larvae and competition with gizzard shad larvae (Dorosoma cepedianum) is likely, we hypothesized that first-feeding Pomoxis spp. larvae would be susceptible to slow growth and starvation. We estimated survival by comparing proportional weekly cohort distributions of Pomoxis spp. larvae and juveniles. When distributions differed, a cohort survival index was evaluated against density

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Mokany, Allie, and Richard Shine. "Competition between tadpoles and mosquitoes: the effects of larval density and tadpole size." Australian Journal of Zoology 50, no. 5 (2002): 549. http://dx.doi.org/10.1071/zo01082.

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Tadpoles and mosquito larvae compete for scarce resources in natural freshwater ecosystems, but factors determining the extent of competition between these two groups of organisms remain largely unstudied. Natural ponds display great variation both in the densities of larvae, and in the body sizes of tadpoles. We set up replicated artificial pond experiments to examine the effects of population density and tadpole size on interactions between tadpoles and mosquito larvae. We examined the effects of larval density in two systems of co-occurring tadpoles and mosquito larvae, one from brackish-wa

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De Villena, Fernando A., Vincent A. Fritz, Jerry D. Cohen, and William D. Hutchison. "Changes in Gluconasturtiin Concentration in Chinese Cabbage with Increasing Cabbage Looper Density." HortScience 42, no. 6 (2007): 1337–40. http://dx.doi.org/10.21273/hortsci.42.6.1337.

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Changes in the levels of gluconasturtiin (2-phenylethyl glucosinolate), an aromatic glucosinolate, was used to evaluate the response of ‘Green Rocket’ Chinese cabbage (Brassica campestris ssp. pekinensis L.) to the feeding of three and five cabbage looper (Trichoplusia ni Hübner) larvae per plant. Plants were harvested 0, 10, and 17 days after infestation. The change in gluconasturtiin concentration resulting from decreased light capture from diminished leaf area was also studied. All samples were assayed for gluconasturtiin concentration using high-performance liquid chromatography. The gluco

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Le, Luong T. "Effects of types and quantity of live food on growth performance and survival rate of cobia larvae (Rachycentron canadum)." Journal of Agriculture and Development 18, no. 4 (2019): 42–50. http://dx.doi.org/10.52997/jad.6.04.2019.

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The objective of the study was to evaluate effects of 3 different diets and 3 different live food stocking densities on cobia fingerling rearing in composite tanks system in the Ninh Thuan 1st grade Seafood Breeding Center from 6 - 25 days old. The experiment was performed as a 3 × 3 factorial design [live food types: 100% Copepoda (Cop), 100% Nauplius of Artemia (Art), and 50% Copepoda + 50% Artemia; live food stocking densities: 5 - 10 individuals/mL, 10 - 15 individuals/mL, and 15 - 20 individuals/mL]. Each treatment had 5 replicates. After the nursery phase, the results showed that environ

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Baker, Robert L., and Susan M. Dixon. "Wounding as an index of aggressive interactions in larval Zygoptera (Odonata)." Canadian Journal of Zoology 64, no. 4 (1986): 893–97. http://dx.doi.org/10.1139/z86-134.

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We investigated the use of the frequency of wounds to legs and lamellae of larval Zygoptera as an index of aggressive interactions. Criteria for recognizing recent wounds were based on laboratory studies of Ischnura verticalis and Enallagma ebrium larvae with autotomized legs and lamellae; legs and lamellae showing less than 75 and 66% regeneration, respectively, were likely wounded in the preceding instar. Laboratory studies indicated that the frequency of wounds was strongly related to the number of aggressive interactions and that, when smaller larvae were paired with larger larvae, the sma

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Martin, Ian D., and David R. Barton. "The formation of diapause aggregations by larvae of Neophylax fuscus Banks (Trichoptera: Limnephilidae) and their influence on mortality and development." Canadian Journal of Zoology 65, no. 11 (1987): 2612–18. http://dx.doi.org/10.1139/z87-396.

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Fifth-instar larvae of the caddisfly Neophylax fuscus Banks (Trichoptera: Limnephilidae) enter a 4-month diapause in April after aggregating on the undersides of stream rocks in gravel cases. Aggregations have up to several hundred members, and densities within aggregations range from 1000 to 17 263 cases/m2. Field experiments conducted between 1984 and 1986 showed that larvae preferred to settle where initial larvae had already attached, but that there was no evidence for a chemical cue for aggregation. Mortality during the diapause but before pupation averaged 37.9%. Both exposure to low wat

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Wilson, Kenneth, and Robert I. Graham. "Transgenerational effects modulate density-dependent prophylactic resistance to viral infection in a lepidopteran pest." Biology Letters 11, no. 3 (2015): 20150012. http://dx.doi.org/10.1098/rsbl.2015.0012.

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There is an increasing appreciation of the importance of transgenerational effects on offspring fitness, including in relation to immune function and disease resistance. Here, we assess the impact of parental rearing density on offspring resistance to viral challenge in an insect species expressing density-dependent prophylaxis (DDP); i.e. the adaptive increase in resistance or tolerance to pathogen infection in response to crowding. We quantified survival rates in larvae of the cotton leafworm ( Spodoptera littoralis ) from either gregarious- or solitary-reared parents following challenge wit

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Okuyama, T. "Density-dependent distribution of parasitism risk among underground hosts." Bulletin of Entomological Research 109, no. 4 (2018): 528–33. http://dx.doi.org/10.1017/s0007485318000871.

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AbstractVariation in parasitism risk among hosts can arise from between-patch and within-patch factors, but considerably less information is known about the latter. This study investigated how distributions of the oriental fruit fly Bactrocera dorsalis influenced its parasitism by the pupal parasitoid Dirhinus giffardii in the laboratory. Because B. dorsalis larvae pupate underground, pupation depth was considered as an important factor that affects the risk of parasitism. When the density of B. dorsalis larvae was varied (1, 10, and 100 larvae per arena), average pupation depth increased with

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Abdurrakhman, Abdurrakhman. "GAMBARAN INDEKS LARVA AEDES AEGYPTI DI BUFFER WILAYAH KERJA BANDARA SEPINGGAN BALIKPAPAN." Medical and Health Science Journal 3, no. 1 (2019): 33–40. http://dx.doi.org/10.33086/mhsj.v3i1.924.

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   The House index and Container Index in the buffer area of the working area of Balikpapan Sepinggan Airport is still above 1%, so the potential for the spread of dengue disease. Mobilization of people, goods and transportation equipment will increasingly affect the transmission of disease in ports and airports, especially for vector-borne diseases. This study aims to analyze the risk factors associated with larvae density of Aedes aegypti and describe the larvae index in the buffer zone of the Sepinggan Balikpapan Airport This study was a descriptive study with a cross sect

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