Estimates of Mortality Rates from Tag Recoveries

Abstract

Maximum likelihood and weighted regression estimators for determining the rate of survival and the rate of exploitation from tag recoveries are presented. Single release models for a continuous fishery with exact-time or interval-accuracy recovery data and the use of pre-season releases to estimate type (1) losses are treated in detail. Discontinuities in the application of fishing effort, recruitment of tagged fish, and incomplete reporting of tags are also considered.