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Growth, reproduction, mortality, distribution, and biomass of freshwater drum in Lake Erie

Journal of Great Lakes Research

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Abstract

Predominant age-groups in the Lake Erie freshwater drum Aplodinotus grunniens population were 3, 4, and 5 as determined from gill net, trap net, bottom trawl, and midwater trawl samples. Age and growth calculations indicated that females grew faster than males. However, the length-weight relation did not differ between sexes and was described by the equation: log W = -5.4383 + 3.1987 log L. Some males became sexually mature at age 2 and all were mature by age 6. Females matured 1 year later than males. Three sizes of eggs were present in ovaries; the average total number was 127,000 per female for 20 females over a length range of 270 to 478 mm. Seasonal analysis of the ovary-body weight ratio indicated that spawning extended from June to August. A total annual mortality rate of 49% for drum aged 4 through 11 was derived from catch-curve analysis. Freshwater drum were widely distributed throughout Lake Erie in 1977-1979, the greatest concentration being in the western basin. They moved into warm, shallow water (less than 10 m deep) during summer, and returned to deeper water in late fall. Summer biomass estimates for the western basin, based on systematic surveys with bottom trawls, were 9,545 t in 1977 and 2,333 t in 1978.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Growth, reproduction, mortality, distribution, and biomass of freshwater drum in Lake Erie
Series title:
Journal of Great Lakes Research
Volume
10
Issue:
1
Year Published:
1984
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 48-58
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Great Lakes Research
First page:
48
Last page:
58