| 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. |
| Genre: | Article |
| ProdID: | 1000094 |
| Citation Author: | Bur, Michael T. |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation End Page: | 58 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Great Lakes Research |
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| Citation Number Of Pages: | 10 |
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| Citation Phsyical Description: | p. 48-58 |
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| Citation Search Results Text: | Growth, reproduction, mortality, distribution, and biomass of freshwater drum in Lake Erie; 1984; Article; Journal; Journal of Great Lakes Research; Bur, Michael T. |
| Citation Start Page: | 48 |
| Citation Volume: | 10 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Growth, reproduction, mortality, distribution, and biomass of freshwater drum in Lake Erie; 1984; Article; Journal; Journal of Great Lakes Research; Bur, Michael T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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