Maturity and Length Frequency Distribution of the Indian Squid Loligo duvauceli Caught in the Gulf of Thailand

Abstract

Samples of the Indian squid Loligo duvauceli, 5,303 males and 6,149 females, were collected by otter boad trawlers and light-luring fishing boats off the west coast of the Gulf of Thailand from 1986-1989. The speciments were classified into five stages of maturity for both sexes. The group maturity curves showed that sizes at 50% maturation approximated 17cm ML for males and 10 cm ML for females. Two substantial recruitments of catchable stock were found in December-March and July-October, based on the appearance of larger sized squids rather than the 50% mature sizes. Assuming that the successive shift observed in the length frequency distributions are expressed by the von Bertalanffy growth equation and the time from birth to recruitment was 4 months, the growth parameters K were estimated at 0.083 month-1 for male squid and 0.095 month-1 for female squid. © 1993, The Japanese Society of Fisheries Science. All rights reserved.