Vibriosis caused by opportunistic and secondary bacterial pathogens is still a serious disease problem in aquaculture of the black tiger shrimp Penaeus monodon. Attempts were made for controlling shrimp bacterial disease using Marine Secondary Metabolites (MSMs). Findings indicated that the MSMs of seaweed Ulva fasciata and Dendrilla nigra are effective for controlling shrimp bacterial pathogens.
Rational management of fisheries in order to optimize harvests requires a constant input of data on the state of the Fish stocks, and in particular, of their mortality rates. Such data are usually obtained by laborious gathering of catch and effort statistics, accompanied by separate investigations designed to produce estimates of the biological and fishery parameters which govern the productivity of the stocks.
ICLARM, the International Center for Living Aquatic Resources Management, is a relative newcomer to the small group of mission-oriented research organizations concerned with international fisheries. It was organized in 1975 and incorporated in 1977 in the Philippines where it maintains its headquarters. The Rockefeller Foundation developed the concept leading to ICLARM, and remains its principal donor.
There is no published information on population dynamics of Lepturacanthus savala in Bangladesh. In the present study, the population parameters of L. savala were estimated to assess its stock in the north-eastern part of the Bay of Bengal.
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.
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).
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.
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.
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.