In some river fishes the belly are fat and shoulders narrow

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Generally the shoulder pieces in river fishes are broad and belly pieces are narrow. The common river fishes like rohu katla mrigel are like that. But there are certain fishes like nayan sundari where the belly pieces are broad and shoulder pieces are narrow. They are also tasty. https://www.youtube.com/shorts/pS9Xvlz5Jtk