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Estimating Populations of Larval Sea Lamprey with Electrofishing Sampling Methods
Author(s) -
Pajos Tiina A.,
Weise Jerry G.
Publication year - 1994
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 - 10.1577/1548-8675(1994)014<0580:epolsl>2.3.co;2
Subject(s) - petromyzon , lamprey , electrofishing , streams , transect , tributary , population , habitat , sampling (signal processing) , population density , ecology , environmental science , fishery , larva , biology , geography , cartography , computer network , demography , filter (signal processing) , sociology , computer science , computer vision
Habitat classification and depletion sampling provided data for population estimates oflarval sea lamprey Petromyzon marinus in six streams tributary to the Great Lakes. At randomly chosen transects, the substrate was classified as to its suitability as habitat for larval lamprey. Depletion sampling at each transect with electroshockers produced density estimates. Population estimates were calculated from the mean density over all larval habitat within the streams. Box–Cox transformations of densities (adjusted for gear efficiency) were used to approximate normal distributions. Adjusted mean sea lamprey larva densities ranged from 0.0013/m 2 to 22.7 1 /m 2 in the six streams surveyed. Stratified random sampling with quantitative depletion surveys on streams is a low‐cost methodology for comparative population estimates of larval sea lamprey. Few people are required, and a large number of streams can be surveyed in a short period of time.