Reproductive Biology of Johnius carouna (Cuvier, 1830)off the Coast of Songkhla Province

Abstract

A study on reproductive biology of Johnius carouna (Cuvier, 1830) in the coast of Songkhla Province was undertaken from February 2012 to April 2013. samples of 3,386 fish were collected by using 4 artisanal fishing gears (croaker gillnet, Rastrelliger gillnet, Metapenaeus affinis trammel net and Penaeus merguiensis trammel net). It was found that the relationship between total length and weight for female and both sex (male and female) were allometric growth. However, it indicated isometric growth for male. Moreover, the length-weight relationship was not significantly different (P=0.121) between male and female Johnius carouna. The spawning season is during September and January. Fecundity ranged from 4,750-111,917 (27,693 ± 18,114). Sex ratio was 1: 3.3.