Abstract
The production of Sphaerium. lacustre in Lake Houhu was estimated by two methods. The results were: 1.048 g/(m2a) of fresh weight with shell or 0.0599g/(m2a) of dry weight shell-free by size-frequency method; 1.178 g/(m2a ) of fresh weight with shell or 0.0673 g/(m2a) of dry weight shell-free by instantaneous growth method. The corresponding P/B ratio were 3.23.4, respectively. Thus, the results by the two methods are coincided each other.
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