The Isostichopus fuscus fishery in Mexico was heavily exploited until 1994, when it was closed due to overfishing. However, no information existed on the status of the populations. The fishery was evaluated through an age structured simulation model, and according to our analysis of the stock, the fishery can be feasible and sustainable as long as fishing mortality and age of first catch are op...

We consider a model of a fishery in which the dynamic of the unharvested fish population is given by the stochastic logistic growth equation dx(t) = [κx(t) (θ − x(t))] dt+ σx(t)dW (t). Similar as in the classical deterministic analogon, we assume that the fishery harvests the fish population following a constant effort strategy. In a first step we derive the effort level that leads to maximum e...

Stock assessment of Otolithes ruber was carried out using Virtual Population Analysis (VPA) method in the coastal waters of Northwest area of the Persian Gulf. Catch and length frequency data during 2002-2012 were converted to age frequency. The maximum of stock number and biomass were observed in age group 1 and 2, respectively. The minimum stock number and biomass were observed for age group ...

quota in the Kattegat region between Sweden and Denmark, the Irish Sea and the west of Scotland. Environmental groups have long called for the industry to adopt new technologies and practices that can substantially reduce 'bycatch'. Larger mesh size is one straightforward measure that can save more juvenile fish. Charles Clover, author of The End Of The Line, said: " It is ridiculous that we ca...

Commercial fishing is one of the most important human impacts on the marine benthic environment. One such impact is through disturbance to benthic habitats as fishing gear (trawls and dredges) are dragged across the seafloor. While the direct effects of such an impact on benthic communities appear obvious, the magnitude of the effects has been very difficult to evaluate. Experimental fishing-di...

Sustainable Development (SD) is a global role model that claims to function as a general orientation for shaping societal processes, i.e., local, regional, national and international development. This is in line with the Brundtland and justice-oriented understanding of the term. It is understood as a role model and sometimes also interpreted as a regulative ideal. However, it does not state how...

This paper develops a sustainable yield harvesting model for the wild Atlantic salmon (Salmo salar), where the population comprises different age classes. It is shown that the weight– fecundity relationship of the spawning population, comprising young and old fish, is crucial for the maximum sustainable yield fishing composition. First, the optimal harvest is found when fecundity is approximate...

The growth and mortality coefficient of Rutilus frisii kutum, were estimated using length frequency data collected in southern waters of the Caspian Sea during October 2008 to April 2009. The following population parameters were evaluated: length-weight relationship, W = 0.004L 3.258, (r= 0.976) Von Bertalanffy growth constants, W∞ (g) = 4192.3, L∞ (cm) = 70.45, K = 0.2, per year t0 = −0.75 tot...