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Catch Curves and Mortality Rates
Author(s) -
Robson D. S.,
Chapman D. G.
Publication year - 1961
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1961)90[181:ccamr]2.0.co;2
Subject(s) - geography , statistics , biology , demography , fishery , econometrics , environmental science , mathematics , sociology
The assumptions necessary to obtain a valid estimate of survival rate from a single catch curve are discussed. An example of the best estimate of survival rate and its variance is worked out for the case that age is known exactly for the entire sample. A test for validity of the model is illustrated. Methods of estimating the survival rate are also given when some age groups are combined, when an age‐length key is used, and when only a segment of the catch curve is usable. A table is provided to facilitate the estimation in this last case.