Fecundity of wild common carp, Cyprinus carpio, in Anzali Wetland

This study was done on wild common carp and main aims were determination of relationships between fecundity and the fish weight, length and age. One hundred individuals of pre-spawning females with a body weight 285.1-5483 g, total length 27.9-67.1 cm and age 4-12 years old, were sampled in Anzali wetland in 2016 and 2017. A mix subsample was sampled of eggs from front, middle and back parts of ovaries and batch and annual fecundities estimated basis on large eggs and large, medium and small eggs, respectively. The results showed an estimation of 11312-1280460 (170977.6±176651.3) for batch fecundity, 19773-1504448 (228978.1±216295.5) eggs for annual fecundity and 39400-286500 (132400±62400) eggs for relative batch fecundity and 69400-394300 (185400±75200) eggs per one kilogram of body weight for relative annual fecundity. The Pearson correlation coefficient was determined 0.93, 0.84 and 0.71 between batch fecundity and body weight, total length and fish age, respectively and 0.89, 0.81 and 0.72 between annual fecundity and body weight, total length and fish age, respectively and correlation was significant in all of them at ɑ=0.01, too. The averages of batch and annual fecundities increased regularly and significantly (p<0.05) with increasing of the fish size (length and weight) and age. This study stated a more fecundity for wild common carp in Anzali wetland than Golestan shore and it can verify difference in carp populations in southern Caspian Sea as an indicator.