Abundance, Life History, and Growth of Introduced Populations of the opossum shrimp (Mysis relicta) in Subalpine California Lakes

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Abstract
The opossum shrimp, Mysis relicta, was introduced into Donner Lake and Fallen Leaf Lake, California, in 1965. Samples from both lakes in August 1978 and June 1979 and from Donner Lake in November 1980, reveal that the mysids are established throughout each lake. In Donner Lake, the estimated overall lakewide density was 238/m2 in August 1978, 123/m2 in June 1979, and 108/m2 in November 1980. In Fallen Leaf Lake, the overall lakewide density was 114/m2 in August 1978 and 103/m2 in June 1979. Mysids in both populations lived for 2 yr and reproduced each spring at 1 and 2 yr of age. Growth was fastest in the spring and summer and slowest in the fall and winter. Previously published data suggest that mysid life history traits can be predicted based on the productivity of the lake. This study supports this view. When productivity is relatively high, the life cycle lasts from 1 to 2 yr, but when productivity is low, it may take up to 4 yr.Key words: Mysis relicta, life history, species introduction, fisheries management, Fallen Leaf Lake, Donner Lake, Lake Tahoe
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