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A Comparison of Four Methods of Estimating Populations of Hatchery‐Reared Brook Trout at Tomah Lake, Maine
Author(s) -
Havey Keith A.,
Locke David O.,
Smith C. Leslie
Publication year - 1981
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1981)1<186:acofmo>2.0.co;2
Subject(s) - salvelinus , census , trout , fishery , fontinalis , fishing , hatchery , population , geography , statistics , point estimation , commercial fishing , population size , fish <actinopterygii> , biology , mathematics , demography , sociology
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.