Fecundity of three species of Penaeid shrimps, Penaeus monodon (Fabricius, 1798), Penaeus indicus (H. Milne-Edwards, 1837) and Penaeus japonicus (Bate, 1888) of Karachi coast, Pakistan
2009
Yousuf, Farzana | Chazaro-Olvera, Sergio | Noor-Ul-Ain, N.
In order to define the period of maturity of penaeid shrimps at least three indices (fecundity, size structure and density of mature females) are required. During thepresent study the relationships between fecundity and total length, carapace length, ovary length, body weight and ovary weight of three species of Penaeid shrimps, Penaeus (Fenneropenaeus) indicus, Penaeus (Marsupenaeus) japonicus and Penaeus (Penaeus) monodon were found out. Samples of shrimps were collected from fish market, identified to the species level, morphometric measurements of each individual were recorded andthe fecundity of each developed shrimp was estimated.The relationship between body weight and fecundity and between body length and fecundity were linear in all three species. The result indicated positive strong correlation between total length (size) and fecundity in all three species. Positive strong correlationswere observed between carapace length and the fecundity, ovary length and fecundity,body weight and fecundity and ovary weight and fecundity in P. indicus and P. monodonwhile Penaeus japonicus showed moderate positive correlations between all mentioned morphometric parameters and fecundity.There was a strong correlation between fecundity and body length in Penaeus japonicus (r =0.880), fecundity and ovary weight in Penaeus indicus (r = 0.943) andfecundity and carapace length in Penaeus monodon (r = 0.970). The estimated fecundity of Penaeus indicus varied between 989073.36 to 1380581.565 eggs for body length range 14.4 to 20.1 cm while that of Penaeus japonicus varied between 249602.2609 to 320026.71 eggs for length range 15.4 to 19.4 cm and fecundity of Penaeus monodon,with body length range 14.4 to 21.1 cm, varied between 221271.6 to 400296.288 eggs.
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