Abstract

This work describes the length–weight relationship (LWR) and various reproductive parameters of Sardinella melanura caught by artisanal fishers using gillnets along the coast of Phetchaburi. The LWRs were significant (p < 0.001) in female, male, and combined sexes, with corresponding LWR equations of W = 0.0077L^3.0616 (r² = 0.867), W = 0.0067L^3.1055 (r² = 0.890), and W = 0.0061L^3.1473 (r² = 0.893), respectively. Regression coefficients (b) indicated isometric growth in females and males, while in pooled samples, b showed positive allometric growth. The relative condition factors (K_n) (mean ± SE) were 1.02 ± 0.004 in females and 0.99 ± 0.004 in males, and reached a peak in September. The gonadosomatic index (GSI) reached a peak in September, and the breeding season was between August and October. The relative fecundity estimates (mean ± SE) were 2249.3 ± 80.8 eggs⋅cm^–1 and 1037.7 ± 27.9 eggs⋅g^–1. The relationship equations for fecundity–length and fecundity–weight were F = 2.6943 SL^3.79 (r² = 0.587) and F = 603.5 + 1012.9 W (r² = 0.512), respectively. Examples are presented to show how the results of this study could help fishery managers develop appropriate conservation management strategies for this species in the Inner Gulf of Thailand.

中文翻译：

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泰国内湾碧武里沿海水域捕获的黑色沙丁鱼的长度-重量关系和繁殖生物学方面

摘要

这项工作描述了手工渔民在碧武里海岸沿线使用刺网捕获的黑色沙丁鱼的长度与重量关系 (LWR) 和各种繁殖参数。LWR 在女性、男性和混合性别中均显着 ( p  < 0.001)，相应的 LWR 方程为W  = 0.0077L ^3.0616 ( r ²  = 0.867)、W  = 0.0067L ^3.1055 ( r ²  = 0.890) 和W  =分别为0.0061L ^3.1473 ( r ²  = 0.893)。回归系数 ( b ) 表明雌性和雄性呈等长生长，而在合并样本中，b显示正异速生长。相对条件因子（K _n）（平均值±SE）女性为1.02±0.004，男性为0.99±0.004，并在9月份达到峰值。性腺体指数（GSI）在9月份达到高峰，繁殖季节在8月至10月之间。相对繁殖力估计值（平均值 ± SE）为 2249.3 ± 80.8 个卵·cm ^–1和 1037.7 ± 27.9 个卵·g ^–1。繁殖力-长度和繁殖力-重量的关系方程分别为F  = 2.6943 SL ^3.79 ( r ²  = 0.587)和F  = 603.5 + 1012.9 W ( r ²  = 0.512)。举例说明本研究的结果如何帮助渔业管理者为泰国内湾的该物种制定适当的保护管理策略。