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Showing 1 to 20 of 37 for “"Gonadosomatic Index"”.
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Avaliação testicular e seminal de caprinos alimentados com feno de Cenostigma pyramidale (tul.) E. Gagnon & g. P. Lewis
… for histological processing, to determine the gonadosomatic index, the diameter of the seminiferous tubules, the height of the germinal epithelium, volumetric proportion and volume of the testicular parenchyma components; total length of the seminiferous tubules, seminiferous tubule length per …
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Sublethal effects of cadmium and diazinon on reproduction and larval behavior in zebrafish (Brachydanio rerio)
… (DHP) concentrations (diazinon only), gonadosomatic index (GSI), median hatching time, hatch success, and larval swimming behavior were monitored. Additionally, larvae were exposed to Cd during embryonic, hatching, and yolk sac stages and exposed to diazinon during a yolk sac stage to …
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Age, Growth, Reproduction and Population Structure of the Striped Shiner (Luxilus Chrysocephalus) and Duskystripe Shiner (Luxilus Pilsbryi) in the James River, Missouri
… species the oldest individuals were females. Gonadosomatic Index (GSI) data suggested that both species spawn during May and June. Otoliths are a more reliable estimator of yearly age than scales for both species, suggesting that ages may be underestimated for shiners in other studies.
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Benzo[a]pyrene effects on Fundulus heteroclitus reproductive endpoints
… decreased by 10 μg/L BaP. In males, both gonadosomatic index (GSI) and plasma testosterone concentrations were significantly reduced compared to controls by 10 μg/L BaP. An increase in empty follicles and interstitial fibrosis was observed by histopathological examination of testes. Other …
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Effects of Diet on Ovarian Development in Largemouth Bass, Micropterus Salmoides
… fed fish were greater than the pellet fed bass. Gonadosomatic index (GSI) was higher in the pellet fed fish indicating that these fish produced more eggs. Testosterone and estradiol levels of the pellet fed bass were higher at almost all times during the annual cycle except in March when the …
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Reproductive Life History of <i>Fundulus jenkensi</i> and Comparative Development of Five Sympatric Fundulid Species
… rare species in need of conservation. Monthly gonadosomatic index (GSI) of male and female <em>F</em>. <em>jenkinsi</em> were documented, and spawning phases and oocyte stages were examined using reproductive histology. In addition, various stages of coastal <em>Fundulus</em> spp. and …
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Growth and Reproduction of Southern Flounder (<i>Paralichthys lethostigma</i>) in the North-Central Gulf of Mexico
… year for females. Histological indicators and gonadosomatic index (GSI) data were used to estimate that the spawning season lasts from November to January, and to classify Southern Flounder as batch spawners. These results will inform future stock assessments and management decisions for the …
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Age, Growth, and Reproduction of Vermilion Snapper (<i>Rhomboplites aurorubens</i>) in the North-Central Gulf of Mexico
… TL). Both histologically-determined phases and gonadosomatic index (GSI) patterns defined the spawning season ranged was from April to September. The spawning interval for Vermilion Snapper was estimated using the hydrated oocyte and post-ovulatory follicle methods, was 1.8 and 2.2 days …
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Life History of the Non-Native Invasive Red Lionfish (<i>Pterois volitans</i>) in the Northern Gulf of Mexico
… corresponding phase identified microscopically. Gonadosomatic index values were elevated for both males and females from May-October, coinciding with elevated water temperatures. On average, a female Red Lionfish in the nGOM is capable of spawning every 2.49 days, 11 months out of the year. Mean …
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Observations on the Life History of the Bayou Killifish, <i>Fundulus pulvereus</i> (Everman 1899) in Mississippi Tidal Marshes
… herons and raccoons. Analysis using the Gonadosomatic Index indicated a spawning season that began in February and extended through August. The information provided here should give a greater understanding of the function of fundulids within the northern Gulf of Mexico tidal marsh systems …
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Experimental cultivation of the South African scallop Pecten sulcicostatus
… reproductive cycle was assessed by means of both gonadosomatic index (GSI) and qualitative and quantitative histological investigation. Environmental parameters were also monitored to determine any linkage to the reproductive cycle. The reproductive cycle was seasonal, with a peak spawning period …
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Cheating and Selfishness in Reproductive Interactions among Nest Associative Cyprinids
… to elucidate potential cheaters. I utilized gonadosomatic index (GSI) to compare reproductive condition among the bluehead chub Nocomis leptocephalus and its putative nest associates in Catawba Creek, Virginia. GSI of potentially obligate associates tracked host GSI more closely than weak …
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The occurrence of a testicular coccidian Eimeria sardinae (Thélohan, 1820) (Reichenow, 1921) in southern Africa sardine Sardinops sagax (Jenyns, 1842)
… of Variance-NOVA, p<0.05) negative effect on the gonadosomatic index values of infected fish from both the west and south coasts. There was a declining trend in condition factor values with increasing intensity of infection category, however no significant effect was observed. The marked negative …
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The effects of Hydroxypropyl-β-Cyclodextrin on the American Flagfish (Jordanella floridae) over one complete life-cycle
… growth, condition factor (K) and hepatosomatic index (HSI) when chronically exposed to HPβCD (P ≤ 0.05). A significant increase in female gonadosomatic index (GSI) occurred in those exposed to HPβCD (P ≤ 0.05). A reduction in the time to reach steady-state spawning occurred at 1600 μg/L of …
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Aspects Of Reproduction And Diet In A Coastal South Carolina Population Of Longnose Gar, Lepisosteus Osseus
… F) were calculated for prey items along with an index of relative importance (IRI). Of the 308 gar stomachs sampled; in winter months 76% of stomachs examined were empty. In spring the percent empty decreased to 54%, and in summer the percent empty decreased further to 33%. Overall, fish were an …
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Reproductive Manipulation and Larval Rearing Techniques of Yellow Perch (Perca flavescens)
… LHRHa and pimozide to induce spawning. The mean gonadosomatic index for manipulated females was 24.2% and the mean fertility of eggs from manipulated females was 26.5%. The fertilization rate was significantly greater among strip-spawned females than tank spawned females (p < 0.05). The time to …
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The Effect of Gonadotropin Releasing Hormone on Opsin Gene Expression and Spectral Sensitivity in Zebra Cichlid Fish (Metriaclima zebra).
… on a functional level, there were changes in the gonadosomatic index in the intubation group. Quantitative real-time RT-PCR (qRT-PCR) and in situ hybridization demonstrated that treatment with a synthetic GnRH3 analogue using the oral intubation delivery system resulted in statistically …
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Age Validation and Reproductive Biology of Bluefish, <i>Pomatomus saltatrix,</i> Along the East Coast of United States
… ± 0.03, t0 = -.301 ± 0.18. Histology, trends in gonadosomatic index, and oocyte diameter frequencies were used to determine bluefish spawning locations and patterns. Bluefish are multiple spawners with indeterminate fecundity. The presence of all stages of development in fully mature ovaries …
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Age, Reproduction, Growth, Condition and Diet of the Introduced Yellow Bass, Morone Mississippiensis, in Barren River Lake, Kentucky
… condition was assessed using the mean gonadosomatic index (GSI) of all sexually mature individuals by month. Yearly growth rates were estimated by computing the mean length at age for each age class and subsequent calculation of the von Bertalanffy growth function (VBGF). To estimate …
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Age, Reproduction, Growth, Condition and Diet of the Introduced Yellow Bass, <i>Morone mississippiensis</i>, in Barren River Lake, Kentucky
… condition was assessed using the mean gonadosomatic index (GSI) of all sexually mature individuals by month. Yearly growth rates were estimated by computing the mean length at age for each age class and subsequent calculation of the von Bertalanffy growth function (VBGF). To estimate …
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