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Seasonal population characteristics of the opossum shrimp, Mysis relicta, in southeastern Lake Michigan, 1970-71

Proceedings of the 15th Conference on Great Lakes Research

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Abstract

This study of depth distribution, abundance, growth, reproduction and standing crop of the opossum shrimp, Mysis relicta, in southeastern Lake Michigan was based on monthly samples collected from August 1970 through July 1971 (except February and March). Population density was usually low at 10-20 fathoms, moderate at 25-30 fathoms and relatively high at 35 fathoms and deeper. Abundance was highest in midsummer and lowest in December. Free-living mysids were 3-25 mm long. Average growth rate was 1 mm per month. At maximum lengths, females were longer than males. Weight increased as approximately the cube of the length. The population consisted mostly of juveniles during summer and autumn and subadults and adults in winter and spring. Sizable numbers of adults apparently moved to relatively shallow water (10-35 fathoms) in winter, where they bred and released their young. In deeper water (40 fathoms or more), some reproduction occurred throughout the year. Most recruitment was in April and May. Standing crop ranged as high as 50 kg per hectare. Mysis apparently has a one-year life cycle in southeastern Lake Michigan.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seasonal population characteristics of the opossum shrimp, Mysis relicta, in southeastern Lake Michigan, 1970-71
Series title:
Proceedings of the 15th Conference on Great Lakes Research
Volume
15
Year Published:
1972
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 117-131
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the 15th Conference on Great Lakes Research
First page:
117
Last page:
131
Number of Pages:
14