Maturity length, fecundity and spawning season of Atlantic chub mackerel Scomber colias in the coastal waters of Ghana (west-central Gulf of Guinea)

IF 1.4 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

African Journal of Marine Science Pub Date : 2022-07-03 DOI:10.2989/1814232X.2022.2113140

Jemimah Etornam Kassah, J. Blay, I. Okyere, N. Lazar

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引用次数: 0

Abstract

Aspects of the reproductive biology of Atlantic chub mackerel Scomber colias are reported here based on data from random samples of artisanal fish landings from Ghana. The specimens were between 13.7 cm and 40.7 cm total length (TL), and both sexes matured at a mean length (L m50) of approximately 25 cm TL. An overall sex ratio of 1:1 was estimated for the population. Absolute fecundity of the fish ranged between 10 220 and 155 791 eggs (mean 48 238 [SE 2 324] eggs) in individuals measuring between 22.8 and 36.5 cm TL and weighing 104.3 to 525.3 g. Monthly variations in the gonadosomatic index and the proportion of fish with ripe gonads in the samples indicated the occurrence of spawning activities during two periods, March–April and June–August, the latter period of which coincided with the coastal upwelling season in Ghanaian waters. These findings are compared with those for chub mackerel from the northwestern and southwestern coasts of Africa. The results of this study will help inform the management of this small pelagic species in Ghana.

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加纳（几内亚湾中西部）沿海海域大西洋斑鱼Scomber colias的成熟期、繁殖力和产卵季节

根据加纳手工捕鱼的随机样本数据，本文报道了大西洋斑鱼Scomber colias的繁殖生物学方面。标本的总长度（TL）在13.7厘米到40.7厘米之间，两性的平均长度（Lm50）约为25厘米TL。估计该群体的总体性别比为1:1。该鱼的绝对繁殖力在10 220至155 791个卵（平均48 238[SE 2 324]个卵）之间，个体的TL在22.8至36.5 cm之间，体重在104.3至525.3g之间。性腺指数和样本中性腺成熟的鱼类比例的月度变化表明，在3月至4月和6月至8月这两个时期发生了产卵活动，其后期恰逢加纳水域的沿海上升流季节。这些发现与来自非洲西北和西南海岸的胖乎乎的鲭鱼进行了比较。这项研究的结果将有助于为加纳对这种小型中上层物种的管理提供信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

African Journal of Marine Science 生物-海洋与淡水生物学

CiteScore

2.60

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： The African (formerly South African) Journal of Marine Science provides an international forum for the publication of original scientific contributions or critical reviews, involving oceanic, shelf or estuarine waters, inclusive of oceanography, studies of organisms and their habitats, and aquaculture. Papers on the conservation and management of living resources, relevant social science and governance, or new techniques, are all welcomed, as are those that integrate different disciplines. Priority will be given to rigorous, question-driven research, rather than descriptive research. Contributions from African waters, including the Southern Ocean, are particularly encouraged, although not to the exclusion of those from elsewhere that have relevance to the African context. Submissions may take the form of a paper or a short communication. The journal aims to achieve a balanced representation of subject areas but also publishes proceedings of symposia in dedicated issues, as well as guest-edited suites on thematic topics in regular issues.