ESTIMATION OF SURVIVAL RATE IN THE EARLY- STAGE OF RELEASED ARTIFICIAL YOUNG ABALONE BY THE CAPTURE-RECAPTURE DATA

The artificially cultured young abalone Haliotis discus hannai of indi viduals were released in the survey area of Iwate prefecture for estim ating the mortality rate. The population size and mortality rate were estimated from the data of the recoveries from the multiple experiment s using the Petersen method, Bayes estimation method and revised Jolly model. Validity of these estimations was examined by the same method in the test tank. The Bayes method gave the stablest estimation under the condition that there is no immigration and the initial population size is known. The value of the mortality rate estimated by the Bayes method was 0.0162 day(-1) during the first 23 days after the release. was divided into death and emigration using the Skellam model. decreas e of abalone was caused mainly by death.