LIPID COMPOSITION IN HEPATOPANCREAS OF CHINESE MITTEN CRAB ERIOCHEIR SINENSIS AT DIFFERENT STAGES
CHENG Yong Xu (Department of Oceanography,Xiamen University ,Xiamen 361005,China) DU Nan Shan \ LAI Wei (Department of Biology,East China Normal University,Shanghai\ 200062,China)
Lipid concentration(% organ wet wt.) in hepatopancreas decreased from 34 37% to 28 13% while hepatopancreas index(hepatopancreas wet wt./body wet wt.×100)dropped significantly (6 56～3 77)during fast ovarian development of the Chinese crab Eriocheir sinensis .This suggests that at least a part of the lipid in the hepatopancreas was transported to the ovary. Compared with that of the mature crab in December,the lipid concentration in the hepatopancreas of mature crab in April next year,ovigerous crab and spent crab decreased markedly to 14 02%,8 12% and 9 67% respectively.This indicated that the lipid was used as an energy source. Neutral lipid (NL) made up a major proportion of the total lipid in hepatopancreas (80%),and triacylglycerols comprised nearly all of the NL,except that some cholesterol was found in NL in ovigerous stage. Phospholipid (PL) in hepatopancreas was about the same at different stages.It included mainly phosphatidylcholine (PC) and phosphatidylethanolamine(PE),and PC was more than PE. The fatty acid composition of PL and NL did not show significant difference( P 0 01) except that in the hepatopancreas of immature crab PL contained more arachidonic(C20:4, as high as 17%) and eicosapentaenoic(C20:5 EPA), and less palmitic( C16:0) and palmitoleic (C16:1) as compared wih NL. Both PL and NL contained much less long chain polyunsaturated fatty acids such as C20:5 and C22:6 than their counterparts in the ovary. Oleic(C18:1) was the most important fatty acids either in PL or in NL.Its percentage in the hepatopancreas of immature crab(24%～26%) was much less than that of mature or ovigerous crab(43%～49%). The other major fatty acids were C16:0,C16:1,C18:2,C20:4 and C20:5.
【CateGory Index】： Q958.8,