A Comparison of Four Methods of Estimating Populations of Hatchery-Reared Brook Trout at Tomah Lake, Maine

Autor:	David O. Locke, Keith A. Havey, C. Leslie Smith
Rok vydání:	1981
Předmět:	education.field_of_study Ecology Population Management Monitoring Policy and Law Aquatic Science Biology biology.organism_classification Confidence interval Hatchery Fishery Trout Population estimate Fontinalis Point estimation education Ecology Evolution Behavior and Systematics Salvelinus
Zdroj:	North American Journal of Fisheries Management. 1:186-192
ISSN:	1548-8675 0275-5947
Popis:	Population estimates were computed for seven groups of brook trout (Salvelinus fontinalis) using the single-census Petersen method, two multiple-census methods (Schnabel, Schumacher) and a fishing-success method (Leslie). Based on the relationships between known minimum population sizes of the different groups and point estimates of their magnitudes, indications are strong that the single-point Petersen estimate produced the largest and most reliable estimates. On the same basis, the Leslie method produced the lowest estimates, while those from both multiple-census methods were intermediate in size and virtually identical in magnitude. Confidence intervals (P > 0.01) for each method usually included the point estimates from the other types of methods. Possible reasons for differences in the estimates are discussed.
Databáze:	OpenAIRE
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