Biology of the cleftbelly trevally Atropus atropos (Bloch and Schneider, 1801) from Ratnagiri coast of India

Pub Date : 2023-06-30 DOI:10.21077/ijf.2023.70.2.131346-4

None Akanksha V. Rakhunde, None Vivek H. Nirmale, None Ravindra A. Pawar, None Santosh Y. Metar, None Bhaskar P. Bhosale

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Abstract

The cleftbelly trevally Atropus atropos (Bloch and Schneider, 1801) is one of the important carangid species landed mostly as trawl bycatch along Ratnagiri coast. Investigations were carried out on A. atropos with respect to length-weight relationship, condition factor, morphometrics, feeding and reproductive biology. The length-weight relationship indicated negative allometric growth in A. atropos. Morphometric measurements showed significant correlation with total length. The gut content analysis revealed A. atropos to be a carnivore fish feeding mainly on Acetes spp., small teleostean fishes, cephalopods, and squilla. Sex ratio showed dominance of males. Gonadosomatic index and maturity studies indicated that A. atropos has a protracted spawning season extending from May to December. Length at sexual maturity for females was estimated to be 171 mm. Fecundity ranged from 16458 to 138688 eggs with an average of 70097 eggs. Ova diameter studies showed that A. atropos spawns twice in a protracted spawning season. Keywords: By-catch, Carangidae, Carnivore, Reproductive biology, Spawning season

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印度拉特纳吉里海岸裂腹龟Atropus atropos的生物学研究(Bloch and Schneider, 1801)

狭腹鲹(cleftbelly trevally Atropus atropos, Bloch and Schneider, 1801)是主要作为拖网副渔获物登陆Ratnagiri海岸的重要虾科鱼类之一。从体长-体重关系、条件因子、形态计量学、摄食生物学和生殖生物学等方面对阿特罗普沙鼠进行了研究。长-权关系表明香椿象的异速生长呈负相关。形态测量与总长度有显著的相关性。肠道成分分析表明，阿特罗普鱼是一种食肉性鱼类，主要以亚纲类、小型硬骨鱼类、头足类和鱿鱼为食。性别比表现为雄性优势。性腺指数和成熟度研究表明，沙蚕的产卵期从5月延长至12月。雌性性成熟时的体长估计为171毫米。产卵量为16458 ~ 138688个，平均为70097个。卵径研究表明，在一个漫长的产卵季节，阿特罗普沙蚕产卵两次。关键词:副渔获物，肉食性动物，繁殖生物学，产卵季节

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