冬季饥饿再投喂对菲律宾蛤仔生长、存活和生化组成的影响

2007年12月—2008年4月，在冬季低温（水温3.0 ℃～4.2 ℃、盐度25～27、pH 7.90～8.16）条件下，采用饥饿时间不等、恢复投喂时间相同的方式，研究了饥饿再投喂对不同规格菲律宾蛤仔生长、存活及体组分的影响.结果表明：在冬季低温条件下，各试验组菲律宾蛤仔生长性状的差异不明显；其对饥饿的耐受能力随着蛤仔规格的增大而升高；存活率随着饥饿时间的延长而降低，但整个试验过程中未出现不可逆点.从较大规格菲律宾蛤仔（壳长7 mm）的体组分上看：菲律宾蛤仔水分、脂肪含量随着饥饿时间的延长而下降；蛋白质含量在饥饿前期随着脂肪的消耗而上升，后期因脂肪的过度消耗开始被利用而下降；灰分含量在整个试验过程中的变化不显著.

Effects of starvation and refeeding in winter on the growth, survival, and biochemical composition of different size Ruditapes philippinarum

From December 2007 to April 2008, a laboratory experiment was conducted to study the effects of various starvation periods followed by the same refeeding period on the growth, survival,and biochemical composition of different size Ruditapes philippinarum at water temperature 3.0 ℃-4. 2 ℃, salinity 25-27, and pH 7.90-8. 16. No significant differences in the growth characteristics of R. philippinarum at low temperatures were observed among different size groups. The tolerance to starvation increased with increasing size, while the survival rate decreased with increasing starvation period, the point-of-no return ( PNR_(50) ) was not observed during the study period. For the larger size group (7 mm), the body moisture and lipid concentrations generally decreased with increasing starvation period. During starvation, the body protein content increased initially as a result of lipid being utilized for energy, but decreased thereafter when the lipid was depleting. Ash content remained unchanged during the study period, and was not affected by starvation or refeeding.