Reproductive biology and histological characteristics of female little tunny Euthynnus alletteratus (Rafinesque, 1810) caught on continental shelf of Côte d’Ivoire

Laurent Bahou, M. d’Almeida, T. Koné, Célestin Atsé Boua, Guillaume Dadi Séripka
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引用次数: 3

Abstract

Some females little tunny (n=395) caught in gillnets and measuring in size from 35 to 76 cm FL (centimetre Fork Length) were sampled from January to December 2004 to study some biological features (length-weight relationship, size at first sexual maturity, eggs variation in diameter, gonado-somatic index, hepato-somatic index, somatic condition, and fecundity) along with histological characteristics of the reproduction process in this species. Female E. alletteratus reached maturity at 42.54 cm FL. Maturity stage distribution and gonado-somatic index (GSI) revealed that spawning period extended from May to October, with a peak value of GSI attained in August. There is a direct correlation between GSI and hepato-somatic index (HSI), and an inverse correlation of these factors to the somatic condition (K c ). The absolute fecundity has linear relationship with the weights of specimens and weights of ovaries. Yet, curvilinear relationship was found between the absolute fecundity and sizes of females. Eggs count in ovaries at spawning (IV) and post spawning (V) stages revealed bimodal size classes, while ovaries at maturing stage III showed unique modal-egg-frequency distribution.
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Côte科特迪瓦大陆架捕获的雌性小金枪鱼Euthynnus alletteratus (Rafinesque, 1810)的生殖生物学和组织学特征
本文于2004年1月至12月选取35 ~ 76 cm(厘米叉长)的刺网捕获的395只雌性小金枪鱼,研究了该物种生殖过程的一些生物学特征(长重关系、初性成熟时的大小、卵直径变化、性腺-体指数、肝-体指数、体状态和繁殖力)和组织学特征。卵期分布和性腺-体指数(GSI)显示,产卵期从5月延长至10月,GSI在8月达到峰值。GSI与肝-躯体指数(HSI)之间存在直接相关,而这些因素与躯体状况呈负相关(kc)。绝对繁殖力与标本重量和子房重量呈线性关系。而雌虫的绝对繁殖力与体型呈曲线关系。产卵期(IV)和产卵期(V)卵巢卵数呈双峰型分布,而成熟期(III)卵巢卵数呈独特的模态-卵频分布。
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