Customary marine tenure in Solomon Islands: a shifting paradigm for management of sea cucumbers in artisanal fisheries

With limited success of western models to manage fisheries resources, Customary Marine Tenure (CMT) could be a more effective vehicle for forming and imposing sustainable management of sea cucumber resources in Solomon Islands. Analysis of national export data from 1991 to 2001 shows a decreased landing of sea cucumbers from a record level of 622 tonnes (dried) in 1991 to 240 tonnes (dried) in 2001, with > 75 % of the 2001 landings derived from species of medium- and low-commercial value.

Coastal aquaculture development and the environment: the role of coastal area management

The rapid expansion of coastal aquaculture has serious environmental and socioeconomic consequences, which include large-scale removal of valuable coastal wetlands, land subsidence, acidification, salinization of groundwater and agricultural land, and subsequent loss of goods and services generated by natural resource systems. Practices that are environmentally non-degrading, technically appropriate, economically viable and socially acceptable should therefore be promoted through integrated planning and management within the framework of coastal area management (CAM).

Monoclonal antibodies in fish and shellfish health management in India.

The paper describes the superiority of monoclonal antibodies (MAb) over conventional polyclonal antisera. Studies undertaken indicate that Aeromonas hydrophila isolates are highly heterogenous and variation exists even between isolates from a farm, requiring a large number of MAbs for classification and use of information in vaccine development. However, some of the MAbs could be used for detection of homologous isolates in fish kidney by immunodot assay and evaluation and standardization of biofilm of A. hydrophila for oral vaccination in carps.

Ex-ante impact assessment for research on natural resources management: methods and application to aquatic resource systems

Under a particular representation of the impact path way of natural resource management (NRM) research, economic surplus techniques can also be used for ex ante impact assessment. The method is applied to the case of the WorldFish Center, an international organization specializing in research on aquatic resources in developing countries. A survey of expert opinion is used to estimate productivity improvements and adoption rates for NRM research and its application. A supply-demand model for aquatic commodities is constructed to calculate the resulting change in economic surplus.

Capacity for developing and managing genetically improved strains of tilapia in Africa including broodstock management and quarantine

Human and institutional capacities for developing and managing genetically improved tilapia in Africa are discussed. Discussions are related particularly to the status of hatcheries, rearing facilities, research and extension services, training in genetic enhancement, and fish transfer in major aquaculture countries in Africa. The leading aquaculture producing countries are Egypt and Nigeria along with nine other countries with some intermediate levels of fi sh production. The availability of quality fry and fingerlings constitutes a major constraint.

Socioeconomic and ecological considerations in the management of Lower Guinea rainforest rivers

Low order rainforest streams in Central Africa represent the largest single riverine ecosystem on the continent. Of the 8 million people who live in the Lower Guinea Rainforest, nearly 20% are more or less fulltime fishers and 90% fish at least seasonally. Estimates from Cameroon put the productivity of capture fisheries in forest rivers basins at 0.5 tons/km2/yr or 260 000 tons with a cash value of over $500 million per year.

Assessment and management of coral reef fisheries: biological, environmental and socio-economic aspects

The authors opened discussion by briefly summarising the main points in their paper. Coral reefs occurred predominantly in developing countries and coral reef fisheries were predominantly artesanal. Fishery yields varied greatly from one region to another with an average of about 15 tonnes per kilometre squared per year. However, coral reefs were so remote from potential markets, that the yield possible if all reefs were efficiently exploited would rot be reached. Coral reef fisheries were multi-species fisheries with all the problems for management that term implies.

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