After 1950 traditional herring fisheries were revolutionized by a new technique: sonar, power block, larger
nets and bigger boats. As a result all major herring stocks in the North East Atlantic Ocean collapsed. The
most dramatic decline was that of the Atlanto-Scandian stock between Iceland and Norway from millions
of...
Unfortunately, most of the stocks are damaged by natural disasters or human activities and rebuilding the
stock are urgent requirements. Until now, in the stock management, some policies are commonly believed
to valid but have not been confirmed. A simulation model of the population dynamics incorporating
uncertainty has been already...
We develop a methodological approach using splines to analyze the deterministic population dynamics of fish stocks at low stock levels. Considering the aggregate Northern cod stock by way of illustration, we reject the hypothesis of strong compensation estimated by the conventional regression methods used by classic bioeconomic models.
We study the combined effects of periodically varying carrying capacity and survival rates on the fish population in the ocean (sea). We introduce a new delay differential equation model with a control parameter which describes how fish are harvested.
We consider a predation function as the function of the delayed...