A novel method was used to estimate natural mortality (M) of Kuwaiti Penaeus semisulcatus using tagging data. The new M estimator is based on two tagging experiments with similar products of initial survival after tagging times reporting rate, but with different total mortality (Z) values. The...

A model for describing the seasonally oscillating growth of fish is presented and compared with the commonly used model of D. Pauly and G. Gaschutz (PG). The new model produces results similar to those obtained from teh PG model, except for teh parameter t <subscript>o</subscript) which the new model estimates accurately, such that L <subscript>t</subscrpt>=0 when t = t<subscript>0</subscript>.