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Assessment of Fecundity and Its Relation with Body Parameters of Common Carp, [Cyprinus carpio (var.) communis] in Dal Lake, Kashmir
Methods: The present study aims to estimate the fecundity of Common carp, [Cyprinus carpio var. communis] existing in Dal Lake, Kashmir. The 30 fish samples were collected once every month from the month of January 2018 to December 2018. Fishes were brought to Fisheries Resource Management (FRM), Faculty of Fisheries, SKUAST-K Laboratory for the estimation of total length, weight of fishes and weight of ovaries. Gravimetric and actual counting method was used for the estimation of fecundity.
Fish species exhibit wide variations in fecundity, even among individuals of the same species, size and range (Bagenal, 1957), which may be due to differential feeding success within the members of population prior to spawning (Bagenal, 1978) and probably due to release of the eggs in batches. Variation in fecundity may also be due to the existence of different age classes (Saliu et al., 2007). Fecundity of fishes also varies across species, and within the same species because of differences in age, body length and gonadal weight (Lagler, 1956). The ovaries of two fish with same body weight contain different number of eggs. This variable fecundity may also be associated with genetic diversity indicating that different strains mature and spawn at various body weight and size in its geographical range and is influenced by ecological factors. Lone and Hussain (2009) reported water temperature, photoperiod and rainfall appear to affect growth and development of ovary. Studies related to reproduction of many species have indicated that the reproductive cycle of fishes is closely associated to the environmental changes, particularly temperature, day length and food supply influencing gonadal development initiation and fecundity. Determination of the reproductive pattern is an essential component in managing and improving fishery biology of any species (Iram et al., 2018; Bhat et al., 2010). Conservation and survival of any fish species depends more importantly on its reproductive potential. Reproduction has key components of fecundity and gonadosomatic index, which are very vital demographic characteristics essential for understanding the life history of a species (Shafat et al., 2016).
Linear relationship between fecundity and fish length; fish weight, ovary length and ovary weight have been reported in different freshwater fish species by various workers (Singh and Srivastava, 1982; Sharaf et al., 1997; Somdutt and Kumar, 2004; Joshi, 2008; Bhat et al., 2003 and Bahuguna and Khatri 2009).
MATERIALS AND METHODS
For the estimation of fecundity, fishes were sacrificed and both the ovaries were taken out carefully. The moisture was thoroughly wiped out from the ovaries with a blotting paper. The length and weight of ovaries was noted down with complete care. The collected ovaries were placed in 10% formaldehyde for at least 24 hours to bring hardness of eggs, so as to make easy and accurate calculation of sticky eggs. This was followed by drying of eggs on blotting paper for 1-2 hours, three subsamples of one gram each from anterior, middle and posterior region were weighed and then eggs were counted carefully by gravimetric method. The mean numbers of eggs were multiplied by gonad parts of ovary weighed on a sensitive mono-pan weighing balance and the total number of eggs per gonad was obtained, i.e fecundity of fish.
The absolute fecundity and relative fecundity was calculated as per the formula given by (Bagenal, 1978):
RESULTS AND DISCUSSION
Relationship among body weight, body length, ovary weight, absolute fecundity and relative fecundity (Table 2). A direct proportional increase in the fecundity with the increase in fish weight has been reported by Dobriyal (1988) and Lehman (1953). During the present study an increase in the number of ova was found with the increase in body weight. Absolute fecundity of [Cyprinus carpio (var.) communis] had a strong correlation with ovary weight than body weight and Total length. These results are in conformity with the results obtained by Khan et al., (1992) for Mystus tengra and Nabi et al., (2007) for Glossogobius giuris.
According to Smith (1947), the fecundity has been more related to the fish weight than to the length in Salvelinus fontinalis. Same has been reported for Liza parsia by Rheman et al., (2002). However, the ‘r’ value in the correlation between fecundity and total weight was higher than that of fecundity and total length, suggesting that total weight is a better predictor of fecundity in the present study than total length. Similar finding have been reported by Ikomi and Odum (1998) in Chrysichthys auratus. Varghese (1961) has found a reduction in the rate of egg production with the increase in ovary weight in Coilia ramcarati. But in present study a corresponding increase in the number of eggs with the increase in the weight of ovary has been found, as in Tilapia nilotica (Soliman et al. 1986), Labeo gonius (Joshi and Khanna, 1980).
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