Two cultured catfish species (European catfish Silurus glanis, and African catfish Clarias gariepinus) were evaluated for their weight estimation and colors by image analysis. A total of 60 whole fish from each species were first weighed, and then their pictures taken by a digital camera in a light box. Length, weight and color of all fish were determined by image analysis and results were compared between the two fish. Fish weight ranged from 7.4 to 39.61 g and 25.71 to 93.91 g for European and African catfish, respectively. Weight (W) vs length (L) data were fitted linear (W = A + BL), power (W = A L^B) and second order polynomial equations (W = C₀ + C₁ L + C₂ L²). The R² values ranged from 0.835 to 0.974. For the W vs view area (V) relationship, the same equations were used. The R² values for these equations ranged from 0.927 to 0.972. No significant difference was found between the average color values according to the L*, a* and b* distributions for both fish species (P > .05). Image analysis can easily determine length, view area, and color of fish and help in developing W vs L, and W vs V relationships.

通过图像分析评估了两种养殖的fish鱼品种（欧洲cat鱼Silurus glanis和非洲cat鱼Clarias gariepinus）的重量估计和颜色。首先称重每种物种的60条整条鱼，然后用数码相机在灯箱中拍摄照片。通过图像分析确定所有鱼的长度，体重和颜色，并比较两条鱼的结果。欧洲和非洲cat鱼的鱼重分别为7.4至39.61 g和25.71至93.91 g。权重（W）与长度（L）的数据拟合为线性（W = A + BL），功率（W = AL ^B）和二阶多项式方程（W = C ₀ + C ₁ L + C ₂ L ²）。R ²值在0.835至0.974之间。对于W与视域（V）的关系，使用相同的方程式。这些方程式的R ²值在0.927至0.972的范围内。在两种鱼的L *，a *和b *分布的平均色值之间均未发现显着差异（P> .05）。图像分析可以轻松确定鱼的长度，视域和颜色，并有助于建立W与L以及W与V的关系。