Comparison of Snorkel and Mark–Recapture Estimates for Trout Populations in Large Streams

Autor:	John. Fraley, Raymond J. Zubik
Rok vydání:	1988
Předmět:	Ecology biology business.industry Fishing STREAMS Management Monitoring Policy and Law Aquatic Science Snorkeling biology.organism_classification Fishery Mark and recapture Trout Abundance (ecology) Salmo clarki Environmental science Flathead business Ecology Evolution Behavior and Systematics
Zdroj:	North American Journal of Fisheries Management. 8:58-62
ISSN:	1548-8675 0275-5947
DOI:	10.1577/1548-8675(1988)008<0058:cosamr>2.3.co;2
Popis:	The abundance of westslope cutthroat trout Salmo clarki lewisi was estimated in three sections of the South Fork of the Flathead River. We made two different Petersen mark–recapture estimates (angling only and angling with snorkeling) and compared them to a snorkel-expansion estimate. Anglers caught and snorkelers classified similar size-groups ofcutthroat trout. The snorkel-expansion estimate was similar to the two Petersen estimates. In one section, we estimated total abundance at 452, 527, and 546 cutthroat trout/km by the hook-and-line Petersen, snorkel-Petersen, and snorkel-expansion methods, respectively. In a second section, we estimated 215 and 221 cutthroat trout/km by the snorkel-Petersen and snorkel-expansion methods, respectively. In a third section, we estimated 183 and 201 cutthroat trout/km by the snorkel-Petersen and snorkel-expansion methods, respectively. We concluded that, in large clear streams with little cover, the snorkel-expansion method provides a quick, reliable density ...
Databáze:	OpenAIRE
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