Feeding dynamics and reproductive biology of the obtuse barracuda Sphyraena obtusata (Cuvier, 1829) from Ratnagiri, central west coast of India

IF 0.4 4区农林科学 Q4 FISHERIES Indian Journal of Fisheries Pub Date : 2023-09-30 DOI:10.21077/ijf.2023.70.3.131669-04

Shraddha D. Ranaware, V. H. Nirmale, B. P. Bhosale, S. Metar, Prakash E. Shingare

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Abstract

The obtuse barracuda Sphyraena obtusata (Cuvier, 1829) is a commercially important foodfish belonging to the family Sphyraenidae and landed mostly as trawl bycatch along Ratnagiri.Investigations were carried out on the species with respect to the length-weight relationship,condition factor, morphometrics, feeding and reproductive biology. The length-weightrelationship showed positive allometric growth in males, females and pooled individuals. Allmorphometric measurements showed a high degree of correlation with total length. The gutcontent analysis revealed S. obtusata to be a carnivore fish feeding mainly on fish juveniles,fish scales, crustaceans and cephalopod appendages. The male:female sex ratio was foundto be 1:0.90. Gonado-somatic index (GSI), maturity and ova diameter studies indicated thatS. obtusata has a prolonged spawning season with individuals spawning twice in a season.Absolute fecundity ranged from 68355 to 310615 eggs with an average of 137783 eggs. Themean length at sexual maturity for females was found to be 22.92 cm. Keywords:Carnivorous fish, Fish biology, Life history,Trophodynamics, Tropical fisheries

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印度中西部海岸 Ratnagiri 的钝吻梭鱼 Sphyraena obtusata (Cuvier, 1829) 的摄食动态和繁殖生物学特征

钝口梭鱼（Sphyraena obtusata，Cuvier，1829 年）是一种具有重要商业价值的食用鱼，属于梭鱼科，主要作为 Ratnagiri 沿岸的拖网副渔获物上岸。雄性、雌性和集合个体的体长-体重关系显示出正的异速增长。所有形态测量结果均显示与总长度高度相关。肠道成分分析表明，S. obtusata 是一种肉食性鱼类，主要以鱼类幼体、鱼鳞、甲壳类和头足类附属物为食。雌雄性别比为 1:0.90。性腺指数（Gonado-somatic index，GSI）、成熟度和卵子直径研究表明，S. obtusata 的产卵期较长，个体在一个季节中产卵两次，绝对受精率在 68355 到 310615 个卵之间，平均为 137783 个卵。雌鱼性成熟时的平均体长为 22.92 厘米。关键词：食肉鱼类鱼类生物学生活史营养动力学热带渔业

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来源期刊

Indian Journal of Fisheries FISHERIES-

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Indian Journal of Fisheries is published quarterly by the Indian Council of Agricultural Research (ICAR), New Delhi. Original contributions in the field of Fish and fisheries science are considered for publication in the Journal. The material submitted must be unpublished and not under consideration for publication elsewhere. Papers based on research which kills or damages any species, regarded as thratened/ endangered by IUCN crieteria or is as such listed in the Red Data Book appropriate to the geographic area concerned, will not be accepted by the Journal, unless the work has clear conservation objectives.