Lake Huron Fish Community Structure Based on Gill-Net Catches Corrected for Selectivity and Encounter Probability
- 1 August 1992
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 12 (3) , 585-597
- https://doi.org/10.1577/1548-8675(1992)012<0585:lhfcsb>2.3.co;2
Abstract
This paper describes the depth distributions and numeric abundance of fishes in the Canadian waters of Lake Huron based upon size-corrected results of experimental netting from 1958 through 1968. Gill-net catches were corrected for encounter probabilities based on the positive correlation between fish size and swimming speed and for retention probability offish of different sizes once they encounter the net. A 3-parameter gamma function was used to fit net-selectivity curves for 13 Great Lakes species. Comparison of raw with corrected catches for Georgian Bay showed that the former exaggerated the relative abundance of deep-water coregonines Coregonus spp. in the deepest strata and overrepresented the abundance of yellow perch Perca flavescens and lake chub Couesius plumbeus in the shallowest waters. Corrections resulted in status changes for several species that are major segments of the fish community. Nearly two decades after the collapse of the top-level native piscivores, Georgian Bay retain...Keywords
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