About 25% of the world's fisheries are depleted such that their current biomass is lower than the level that would maximize the sustained yield (MSY). Using methods not previously applied in the fisheries conservation context, we show in four disparate fisheries (including the long-lived and slow-growing orange roughy) that the...
A model for studying how destructive fishing practices may affect commercial fish stocks through their effect on habitat is presented. It may be used both for renewable habitat-types, like eelgrass (Zostra marina) or sponges, and also practically non-renewable habitats like corals. The model demonstrates the trade-offs between using destructive and...
In many situation, fishing activity adversely impacts the state of the marine ecosystem, impacts which feed back to affect fish stocks. Some ecosystems appear to have multiple equilibria and exhibit hysteresis, whereby they can become stuck in low productivity states. We show how adding ecosystem dynamics to a classic fisheries...
Age and size at maturity are key life-history traits in a fish stock. At the individual level, age and size at maturity affect fecundity, growth and survival. At the population level these factors interact to affect the age and size distribution, the population dynamics and the productivity of the stock....
The expansion of fishing capacity is one of the most pressing problems facing many fisheries around the world. Excess capacity arises when a high number of vessels enter the fishery, and these vessels are
employed to exploit the available fish stocks beyond a target level of yield. The lack or...
The Lofoten fishery exploits the spawning migration of the Northeast- Arctic cod and is one of the fisheries in the world with the longest history. Since 1860, data on participation and catches in the Lofoten fishery are available. For about a hundred years, labor productivity in this fishery, measured as...
Age and size at maturity are key life-history traits in a fish stock. At the individual level age and size at maturity affect fecundity, growth and survival. At the population level these factors interact to affect age and size distribution, the population dynamics and the productivity of the stock. A...
Efficient management of small-scale fisheries resources demands adequate human and financial resources. This mainly relates to research and enforcement activities. Despite the resource constraint, the state has assumed the role of managing the fisheries resources. The emerging global trend, however, recommends cost recovery systems for sustainable fisheries management to achieve...
Are Marine Protected Areas positive for adjacent fisheries? This is a study of the technical efficiency of small-scale trawlers in Nha Trang, Vietnam following establishment of Nha Trang Bay Marine Protected Area (NTB-MPA) that imposed a trawl ban to protect marine biodiversity and regenerate fish stocks. Data were collected through...
The majority of monitored fish stocks globally is fully or over exploited, that is, at or below their maximum sustainable yield stock levels. Despite this resource situation international trade in fish products have been increasing for a long time. An export tax on fish and fish products, as an alternative...