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 grunnienspopulation 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
DOI 10.1016/S0380-1330(84)71806-5
Volume 10
Issue 1
Year Published 1984
Language English
Publisher Elsevier
Contributing office(s) Great Lakes Science Center
Description 11 p.
First page 48
Last page 58
Online Only (Y/N) N
Additional Online Files (Y/N) N