It is a tool for measuring the sexual maturity of animals in correlation to ovary development and testes development. Prey items were identified to the lowest possible taxonomic level using the reference of needham and needham 17 for algae and macro invertebrates. Gonad somatic index and feeding habit of selected fish species of. Analysis of native vtg by polyacrylamide gel electrophoresis page reveals two closelyspaced protein bands, but vtg appears as a single band apparent. Reproductive aspects in addition to condition factor, gonadosomatic index gsi and hepatosomatic index hsi were analyzed based on weight of the body length, total body weight and organ weights of the fish. Hsi is defined as liver weight and fish weight ratio. Comparing histology and gonadosomatic index for determining. Seasonal changes in the gonadossomatic index, allometric.
Study of gonadosomatic index of fresh water fish cyprinus carpio ashwini g. In the female of the species the reproductive cells are the egg cells, and in the male the reproductive cells are the sperm. Pdf gonadosomatic index and testis morphology of common. On the basis of gonadosomatic index the reproductive cycle of n. Gonadosomatic index and testis morphology of common carp. Liver forms important organ of the body, which has a role in the ovarian development. Abstract the seasonal changes in hepatosomatic index hsi, gonadosomatic index gsi and plasma estradiol. Gonadosomatic and hepatosomatic indices of freshwater fish. Gonadosomatic and hepatosomatic indices of freshwater fish oreochromis mossambicus in response to a plant nutrient.
Shadegan is one of the most important wetland that posses various fauna and flora but suffers inputs from agricultural and. Weight of the gonad g g s i x 1 0 0 weight of the fish g diameter of the eggs at different stages of maturity was measured with the help of an objective micrometer. We showed that male reproductive activity is affected by local abiotic factors that stimulate male sexual activity from the end of winter to the beginning of summer, period in which the temperature and rain. Gonadosomatic index of fish is related to spawning and reproduction of fish. We compared gonadosomatic index gsi and histological analysis of ovaries for identifying reproductive periods of fishes to determine the validity of using gsi in future studies. In the present research, accumulation of cd, co, cr, cu, mn, ni, pb, v, and zn were determined in sediments and fillet, liver, kidney, gonads, and gills of three commonly fish species in the largest wetland ecosystem that is located in southwest of iran. Dendropwophus all records that contain the word lithobates or costa rica. Changes in condition factor and gonadosomatic index in. Using the gonadosomatic index to estimate the maturity ogive. The ovary, testis and liver was chosen to measure the gonadosomatic index gsi, hepatosomatic index hsi, histology, total protein, lipid, and acid and alkaline phosphatase enzymes activity.
Monthly average gsi was then calculated and trends were examined to determine spawning periodicities of c. Information on the reproductive biology of some economically important fish species which include west african ilisha ilisha africana, the. Using the gonadosomatic index to estimate the maturity. This index is frequently used as reporting point in oecd test guideline. Roush department of biology, texas christian university, fort worth, texas, usa. Oogenesis, hepatosomatic and gonadosomatic indexes, and sex. Fecundity and gonadosomatic index of glossogobius giuris.
Gonadosomatic index gsi of the male and female fishes of the collected samples were determined separately by using the following method. Time course sampling showed that final oocyte maturation and subsequent ovulation occurred from afternoon to evening on. Gonadosomatic and hepatosomatic indices of the freshwater. The estimated parameters of the maturity ogive were significant p gonadosomatic index, abbreviated as gsi, is the calculation of the gonad mass as a proportion of the total body mass. Gonadosomatic index was calculated, following fish euthanasia by clove oil overdose 60 mg l. It is used to estimate or measure reproductive capacity. Condition factor, gonadosomatic index, sex ratio and length weight relationship of mormyrus rume. The results obtained indicated adverse effects on the gonads as well as on liver weight. Evaluating gonadosomatic index as an estimator of reproductive condition in the invasive round goby, neogobius melanostomus. The order of toxicity is mercuric chloride mixture cadmium chloride. Reproduction is the most critical stage in the life cycle of a species, which determines its survival and success.
Gonadosomatic index is within the scope of wikiproject animals, an attempt to better organize information in articles related to animals and zoology. These methodologies were refined through three years of sampling at three. Gsi is the persentage of gonad weight and fish weight ratio including gonads that expressed gonadal changes quantitatively 14. The gonadosomatc index gsi is a reliable indicator of changes in nutritional and. Rosy barbs were reared from one batch of eggs in aquaria at 27r1qc, and larvae were stocked at 5 larvael.
The live blue crabs were transferred to the laboratory to measure the following variables. Pdf gonadosomatic index value in males during september march were 4. Study of gonadosomatic index of cyprinid fish, salmostoma. Shell condition was classified upon arrival in juneau using the nmfs shell condition index jadamec et al. Sep 29, 2019 gonadosomatic not comparable specifying the ratio of the masses of the gonads and the body 2015 september 24, the olfactory transcriptome and progression of sexual maturation in homing chum salmon oncorhynchus keta, in plos one.
Considering that only maturingmaturespent individuals. Variations in hepatosomatic index hsi and gonadosomatic. The gonadosomatic index is an important indicator of the general health of an organism. Effect of body size on fecundity, the gonadosomatic index. Gonadosomatic index how is gonadosomatic index abbreviated. The weight of each fish was recorded, gonads were removed, weighed and the gonadosomatic index gsi calculated. Studies on the gonadosomatic index and fecundity of chapila. Bioaccumulation of trace elements in different tissues of. Condition factor, gonadosomatic index and sex ratio of the. Previous studies have successfully applied various methods based on the gonadosomatic index gsi to improve accuracy in determining maturity stage mcquinn, 1989. Lawal department of zoology, university of ilorin, ilorin, nigeria abstract.
Changes in condition factor cf and gonadosomatic index gsi in maturing and non. Stub this article has been rated as stubclass on the projects quality scale. The list of acronyms and abbreviations related to gsi gonadosomatic index. Dynamics of gonadosomatic index of fish with indeterminate. Journal of entomology and zoology studies during the study period. All experimental cages contained salmon stocked as smolts in april 2001.
Gonadosomatic index which is an index of gonad size relative to fish size is a good indicator of gonadal development in fish 2 the percentage of body weight of fish that is used for production of eggs is determined by the gonadosomatic index. A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes sex cells and sex hormones of an organism. Pdf the sex ratio, gonadosomatic index, stages of gonadal development and fecundity of saddle grunt fish, pomadasys maculatum block, 1793 of the. Materials and methods this study was performed in recirculating systems, each consisting of four 20 l plastic tanks. The gonadosomatic index gsi, defined as the percentage of the fishs total weight represented by the gonads vazzoler, 1996, was analyzed for each individual through the formula gsiwgwt100. Gonad and body mass were measured to the nearest 0. Four smallbodied riverine species were examined in our comparison of the two methods. The gonadosomatic index gsi is widely used as a simple measure of reproductive capacity, but its validity has often been questioned. Condition factor, gonadosomatic index and sex ratio of the family mormyridae from a small lake in ilorin, nigeria c.
Because this estimate was approximate relative to all of the others in the dataset, we also conducted the analyses using values that ranged from 0. We retained shell2, shell3, and shell4 crab and divided them into two groups for comparison. Gonadosomatic index as a confounding variable in fish. Olele abstract a population of clarotes laticeps family claroteidae was investigated in the lower reaches of the river niger, between illushin in edo state and niger bridgehead in asaba, delta state, nigeria. The minimum gsi values in both male and female fishes were observed in winter i year 0. Relationship of molting, gonadosomatic index, and methyl. Cycle of gonad maturation, condition index and spawning of clarotes laticeps claroteidae in the lower p.
Gonadosomatic index and some hematological parameters in. The testes are relatively large weir, 1974, and the gonadosomatic index testes massbody weight in the adult chinchilla is relatively high compared to most mammals, but is similar to rats and mice leal and franca, 2008. To determine the gonadosomatic index each fish was sacrificed to collect the ovaries and the ovaries were dried with the help of blotting paper and weighed individually by an electric balance and kept in 5% formalin for the preservation of the ovaries as well as to make it much easier to separate the eggs. The effect of body size on fecundity, the gonadosomatic index gsi, egg size, and timing of spawning of gizzard shad dorosoma cepedianum was examined in two large missouri reservoirs during 19871991. Gonadosomatic index an overview sciencedirect topics. These studies allowed immature fish to be separated from spent or recovering fish and identified the degree of maturity for females when. The gonadosomatic index, abbreviated as gsi, is the calculation of the gonad mass as a proportion of the total body mass. To study the effect of estrogenic chemicals on fish, the gonadosomatic index gsi testis weightbody weight. The chinchilla testis has a high seminiferous tubule volume and density leal and franca, 2008. Seasonal changes in hepatosomatic index, gonadosomatic index.
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