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

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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