他们漂泊湖上，以打鱼捕虾为生。
They drifted on the lake , fishing and catching shrimp to get by .
虾青素让生虾肉或生蟹肉呈蓝灰色或绿色。
This pigment creates the characteristic bluish-gray or green color of raw shrimp and crabs .
虾生