Comparison on nutritional quality of adult female Chinese mitten crab (Eriocheir sinensis) with different colored hepatopancreases.

Abstract

White hepatopancreas syndrome has recently emerged in Chinese mitten crab (Eriocheir sinensis) aquaculture, causing considerable economic loss. The hepatopancreas color of diseased crabs becomes gradually lighter, turning from yellow to yellow-white to white. Therefore, this study was conducted to investigate the changes in nutrient composition in three edible parts (hepatopancreas, ovaries, and muscle) of adult females with different colored hepatopancreases. Three groups were assessed in this study, including a yellow hepatopancreas group (control, L *=63.92, a *=22.14, b *=60.95), a yellow-white hepatopancreas group (YWHG, L *=65.06, a *=22.35, b *=57.80), and a white hepatopancreas group (WHG, L *=65.72, a *=10.70, b *=30.52). No statistically significant differences in average weight, tissue indices, and total edible yield were observed among the three crab groups (P>0.05). The moisture content of the hepatopancreases and ovaries in WHG was 56.12% and 9.23% higher than the control values (P<0.05), whereas hepatopancreas crude fat and ovary crude protein levels were 62.23% and 11.45% lower than the control values (P<0.05). The total carbohydrate levels of the three edible tissues were significantly higher and the crude protein content of ovaries was significantly lower in YWHG (P<0.05). Most amino acid levels in the WHG muscle and ovaries were significantly lower than the control (P<0.05). Moreover, the hepatopancreas levels of total polyunsaturated fatty acids (PUFA) and n-6PUFA in WHG were 24.88% and 31.83% lower than in control group, whereas the hepatopancreas levels of total PUFA and n-6PUFA in YWHG were also 21.88% and 23.20% lower compared to the controls (P<0.05). Overall, the growth and the edible parts were not affected in YWHG and WHG. Moreover, YWHG crabs exhibited few effects on nutritional value; however, the fatty acid composition of crabs was significantly changed. In contrast, WHG crabs exhibited poor nutritional quality. Nonetheless, the consumption of crabs with yellow-white or white hepatopancreases is not recommended since the animal also referred to as diseased crabs.