Study of catch composition, by-catch, catch per unit effort (CPUE) and length-weight relationship of the Tigertooth croaker (Otolithes ruber, Bloch and Schneider, 1801) in bottom gillnets in Chabahar region

Document Type : scientific research article

Authors

1 Academic member of Fishing and Exploitation Department, College of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, corresponding author, Gorgan, Iran

2 Fishing and Exploitation Department, College of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources,

3 Gonbad Kavous University

4 Chabahar Maritime University

Abstract

The purpose of the study is to investigate the catch composition, the amount of by- catch, the length frequency and the catch per unit of effort of bottom gillnets for catching the Tigertooth croaker, using mesh size of 73, 85 and 90 mm in the waters of the Oman Sea in the period of winter 2018 to the late spring of 2019. 973 pieces of fish including 15 families were caught, and the highest catch rate was 63.81% for the Tigertooth croaker. The rate of by- catch was 8.76%. The amount of CPUE for the mentioned mesh size was estimated as 552.9, 808.9 and 456.9 grams per net day respectively. By examining the length frequency distribution in all the meshes, it was determined that the highest frequency is in the length of 32-36 cm with 43.67%. Also, an average length of 31.80±6.64 cm was recorded in the whole operation. According to the first maturity length of the Tigertooth croaker, it was determined that the bottom gillnets available in the Chabahar region fishing grounds had a catch below the standard size, and it seems the mesh size of the net should be reviewed and standardized.

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Journal of Utilization and Cultivation of Aquatics
Volume 13, Issue 3
December 2024
Pages 141-154

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