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Showing 1 to 20 of 24 for “"Gonadosomatic Index (GSI)"”.
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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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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 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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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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Bioenergetic and ecological consequences of diet variability in Atlantic croaker Micropogonias undulatus
… weight (Wr), energy density, hepatosomatic index (HSI), and gonadosomatic index (GSI). Of these condition measures, several morphometric measures were significantly positively correlated with each other and with the percentage (by weight) of anchovy in croaker diets, suggesting that the type …
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Growth, Distribution, and Movement of Northern Pike in a South Dakota Natural Lake, With Sampling Considerations
… peak growth at approximately 10-14 ° C. Mean gonadosomatic index (GSI) values of male northern pike were highest during autumn; most testicular growth occurred during August and September. Mean GSI values for female northern pike were highest during March and April. Ovarian growth occurred …
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Sexual maturation in sea- and freshwater phases of Pacific salmonids and investigations of reproductive hormone involvement in osmoregulatory adaptation
… Nitinat River, and at the post-spawning stage. Gonadosomatic index (GSI), hepatosomatic index (HSI), and oocyte germinal vesicle stage and hydration level were measured in sacrificed chinook and steelhead. Stamp River steelhead were serially sampled for blood during the month preceding and the …
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Selected elements in Lake Michigan round goby (Neogobius melanostomus) reproductive physiology: spawning effort and determination of reproductive status of females and sperm competition in two reproductively distinct male morphs
… 14-17°C. Peak spawning effort as determined by Gonadosomatic Index (GSI) score correlates with the highest proportions of mature oocytes and is indicative of oocyte turnover. This confirms the usefulness of GSI as a good indicator of spawning activity. Monthly egg counts were largely unchanged …
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Bighead and silver carp hybridization in the Mississippi River Basin: prevalence, distribution, and post-zygotic selection
… stage gonads containing mature oocytes) and mean gonadosomatic index (GSI) of spawning stage females did not differ between parentals and hybrids throughout the MRB. Bimodal hybrid distribution indicated high densities of parentals and late generation hybrids and low densities of early generation …
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Modelling the effects of spatio-temporal spawning variability on the transport and retention success of sardine (Sardinops sagax) eggs and larvae around South Africa
… matching observations, incorporating gonadosomatic index (GSI) values, diurnal vertical migration and buoyancy.
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Responses of wild freshwater fish to anthropogenic stressors in the Waikato River of New Zealand
… rates, condition factor, age structure, and gonadosomatic index (GSI) suggest that discharges with significant heat or nutrients benefit brown bullhead despite physiological impairment at the BKME site. Shortfin eel individuals also benefited from heated water discharges. No consistent …
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