SEASONAL CHANGES OF PROTEIN AND FAT OF Nevertia didyma (Rding)
ZHENG Huai ping GAO Jian(Department of Marine Engineering , Engineering College of Yancheng, Yancheng, 224003)
Protein and fat contents of different body parts of Nevertia didyma from December, 1999 to November, 2000 were measured and analyzed. Seasonal changes of both protein and fat are relate to the water temperature and reproductive seasons. The seasonal differences are obvious. Howerer, the sexual distinction differences of both protein and fat are not significant. The protein of the foot is the largest, 82.04%. The proteins of both gonad and liver are lower, less that 70%. The fat of the foot is the lowest, only 1.83%. Compared with other body parts, the fats of both gonad and liver are high, especially for the female gonad. The annual average of the fats of the female′s is 12.85 and up to 19.36 in April.