Compensatory mechanisms of the Peruvian hake population (Merluccius gayi peruanus) in response to heavy exploitation and changes in species interaction are discussed. Changes in the rate of cannibalism, diet composition, maximization of fecundity and behavioral adaptation are noted.
In 1999, the world's seafood (fish, crustaceans, molluscs) production reached 106.8 miilion mt, with 92.9 million mt derived from capture fisheries and 13.9 million mt from marine/brackish water aquaculture. Out of the total seafood production, molluscs comprised 13.6 million mt, of which 3.4 million mt (25.2%) were from capture fisheries. Seafood is one of the most highly traded commodities in the world market, and has experienced a doubling of trade volume between 1984 and 1994.
The parameters a and b of the length-weight relationship of the form W = a . L super(b) were estimated for 57 fish species sampled in Sao Sebastiao Channel and shelf system in 1997, Sao Paulo, Brazil. The b values ranged from 2.746 to 3.617. The Student's t-test revealed that mot (44) species had b values significantly different from 3. A normal distribution of the calculated LWR exponents (b) was obtained.
In this review, the authors briefly describe the nature and status of the main inshore marine fisheries of Solomon Islands. In virtually all cases, quantitative data on stock sizes are lacking and this article concentrates on outlining the size and extent of the resources, their current and projected uses and the existing controls on their exploitation.
The degree of competition between fisheries and marine mammals in the Pacific Ocean was estimated for 7 statistical areas defined by the Food and Agriculture Organization of the United Nations (FAO). Catch statistics compiled from FAO sources show that the amount of fish caught in the Pacific Ocean rose from 2 million tons in the late-1940s to over 50 million tons in the early-1990s. Recent stagnation and declines occurring in some areas of the Pacific suggest that Pacific fisheries cannot continue to expand as they had previously.
A joint Sierra Leone/1CLARM project funded by the Commission of the European Communities is presented, whose task is to assemble the available survey and fisheries data on the marine fish resources of Sierra Leone, analyze them, and based thereon, propose a management regime for these resources. The computerized databases and other tools developed for this purpose and for monitoring and analyzing the fisheries after the project has ended are presented, and their potential use in neighboring countries is discussed.
The contemporary legal regime for marine capture fisheries is dominated by management based on maximum sustainable yield (MSY). This study examines the law, science, politics and practice of MSY in a selection of developing archipelagic states to assess whether and how MSY is being used in the management of single fish species and as part of a broader ecosystem approach to fisheries management.
Many exploited stocks of aquatic organisms are limited by the supply of juveniles and many also suffer from recruitment overfishing. Consequently, there is much interest in stock-enhancement programs, which are aimed at improving harvests by increasing recruitment to levels approaching the carrying capacity of the habitat. Most stock-enhancement programs involve the release of juveniles reared in hatcheries or the collection, rearing, and transplantation of wild juveniles. Optimized release strategies and increased fitness for life in the wild are required.
The main objective of the Asian Fisheries Social Science Research Network is to build national research capacity to deal with important socio-economic issues in the management of the complex tropical fisheries of the SoutheastAsian region and in the development of the aquaculture industry. Details are given of the Network CommitteeResearch Reports available and workshops and training courses.
Marine reserves are a promising tool for fisheries management and conservation of biodiversity, but they are not a panacea for fisheries management problems. For fisheries that target highly mobile single species with little or no by-catch or habitat impact, marine reserves provide few benefits compared to conventional fishery management tools. For fisheries that are multi-species or on more sedentary stocks, or for which broader ecological impacts of fishing are an issue, marine reserves have some potential advantages.