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Quantitative Sampling of Fish Populations with a Mobile Rising Net
Author(s) -
Espegren Gregory D.,
Bergersen Eric P.
Publication year - 1990
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(1990)010<0469:qsofpw>2.3.co;2
Subject(s) - population , population dynamics of fisheries , sampling (signal processing) , statistics , population size , fish <actinopterygii> , fishery , estimator , environmental science , rainbow trout , biology , mathematics , demography , filter (signal processing) , sociology , computer science , computer vision
A modified pop net (i.e., an inflatable lift net), used to estimate fish population size, was evaluated in a small northern Colorado lake having a stocked population of rainbow trout Oncorhynchus mykiss of known initial size. At the conclusion of pop‐net sampling, the lake was treated with rotenone to estimate final fish population size and the instantaneous daily mortality rate. This rate was used to determine the expected fish population size for each day of sampling. A target value for the population estimates based on pop‐net samples was defined as the mean of the expected daily population sizes. Seven estimators were used to predict total fish population size from pop‐net sampling; 95% confidence intervals for all ratio estimators included the target value. A volume‐based stratified ratio estimator best predicted the fish population size in the study lake.