抄録
The aim of this article is to consider a method for estimating fishing and natural mortality coefficients, denoted by F and M, respectively. It is assumed that the length of the life of atagged fish is distributed as an exponential distribution with mean (F+M)-1. When the sample is grouped and is censored at a certain time, and the group intervals are unequal in length, the problems of estimation of the parameters from tag recoveries are discussed. Using the recovery data of young red sea bream Pagrus major in the Seto Inland Sea, two numerical examples are given. The goodness of fit of the theoretical model to sample data is also demonstrated.
