Abstract

The Indian hilsa shad, Tenualosa ilisha (Hamilton, 1822), is a highly valued fish of the Indo Pacific region. This paper represents the length-weight relationships (LWR), condition factor (K), relative condition factor (K_n), and otolith dimension of hilsa, throughout the Hooghly River (West Bengal) from January to December 2020. The value of exponent “b” in the equation W = cL^b was 2.6 for the species. It suggests the growth rate almost follows the cube law. Most of the population under study complied with the ideal b-value. Regression analysis indicated a high positive correlation between length and weight in the species (R² = 0.76). The K_n shows their general well-being to be good in the river. The relationships between total fish weight and otolith biometry parameters such as long arm (L.A) length, short arm (S.A) length, L.A/S.A, and diameter (D) were examined. Linear regressions have represented fish weight-otolith biometry relationships. Regression analysis indicated a strong positive relationship between body weight and otolith length (R² = 0.848), otolith diameter (R² = 0.803), and short arm length of otolith (R² = 0.678), but no relationship was found between L.A/S.A of otolith and fish weight. This strong relationship between fish weight and otolith length and diameter of T. ilisha, reflects that otolith length and diameter could become the best predictor of fish weight.

中文翻译：

---

了解胡格利河（印度）Tenualosa ilisha 的长度和重量与耳石尺寸之间的关系

摘要

印度鲥鱼Tenualosa ilisha（汉密尔顿，1822 年）是印度太平洋地区的一种高价值鱼类。本文表示长度-重量关系（LWR）、条件因子（K）、相对条件因子（K） _n），以及 2020 年 1 月至 12 月整个胡格利河（西孟加拉邦）的 hilsa 耳石尺寸。方程 W = cL^b该物种的值为 2.6。这表明增长率几乎遵循立方定律。大多数所研究的人群都符合理想的 b 值。回归分析表明该物种的身长和体重之间存在高度正相关关系（R² = 0.76）。 K_n 显示了他们在河流中的总体健康状况良好。鱼总重与长臂（L.A）长度、短臂（S.A）等耳石生物测量参数之间的关系) 长度，L.A/S.A 和直径 (D) 进行了检查。线性回归代表了鱼的重量与耳石生物特征的关系。回归分析表明，体重与耳石长度（R² = 0.848）、耳石直径（ R² = 0.803)，以及耳石短臂长度 (R ² = 0.678)，但未发现 L.A/< 之间存在关系/span>，反映出耳石长度和直径可能成为鱼体重的最佳预测指标。T之间有很强的关系。 ilisha 耳石和鱼重。鱼的重量与耳石长度和直径S.A