In this book the description of the main methodical procedures for study of commercial fish ecology with determinated fecundity and batch spawning such as Atlantic cod, haddock, northern and southern putassu, walleye pollock, and other species of notal and boreal fishes on the example of walleye pollock from the Western Kamchatka is given. Results of analysis of spawning stock structure and its dynamics, peculiarities of oogenesis and spawning, data on fecundity, and ichthyoplanktonic studies are presented. The estimates of spawning stock biomass by the eggs production method are substantiated and realized in practice. Probable causes of mistakes in such estimates are analyzed. The trends, objects, and tasks, as well as a pro9ram for further study of such fishreproductive ecology are determinated on the basis of analysis.This book is of interest for ichthyologists as well as for students of biological and fishery high schools. |
