Length-weight relationships of the ichthyofauna associated with the Brazilian sardine, Sardinella brasiliensis, on the Southeastern Brazilian Bight (22°S-29°S) between 2008 and 2010

In this study, estimates of length-weight relationships are presented for twenty-four species caught in association with the Brazilian sardine, Sardinella brasiliensis, during four acoustics surveys carried out under the Program ECOSAR (Prospecting and evaluation of biomass of the stock of Brazilian sardine on the southeast coast by acoustic methods), which was to evaluate the biomass of species that were caught. The model parameters were estimated with the nonlinear iterative method of least squares. The value of the coefficient of determination (r2) and residual analysis were employed to verify the appropriateness of fit. The coefficient b values were tested with respect to isometry (β=3) using a tα1,0.05 test. The values of coefficient b ranged from 2.377 to 3.538. There is a tendency for positive allometry (b) in the sampled ichythyocenose.

本研究报道了四项依托ECOSAR项目（采用声学方法对东南沿海巴西沙丁鱼种群生物量进行勘探与评估）开展的声学调查中，与巴西沙丁鱼（Sardinella brasiliensis）伴生的24种鱼类的体长-体重关系估算结果，该项目旨在评估捕获物种的生物量。模型参数通过非线性迭代最小二乘法进行估算。采用决定系数（r²）与残差分析验证模型拟合优度。借助tα1,0.05检验，针对等距生长假设（β=3）对系数b的取值开展显著性检验。系数b的取值范围为2.377至3.538。本次采样的鱼类群落呈现出正异速生长（系数b）的趋势。