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The biological effect of fishing bans in tropical waters is considered. In the Philippines, the Samar Sea was closed to trawlers in November 1976; a fishery survey was carried out to monitor possible changes in the fish stocks. In spite of the ongoing activities of a few small trawlers, the biomass of fish in the Samar Sea increased constantly during the survey period.
The catch-effort relationship of the River Nile is Complicated by such factors as changes in water level and hydrology as well as spawning movements of the fish, which result in uneven distribution of the fish and fishing. The effects ofdam construction on the ecology of the fish fauna are considered, with particular reference to the effects of the Faraskour dam on the river fishery.
Shellfish production in Thailand has ranged between 50,000 and 300,000 mt over the past twenty years, with recent production around 120,000 mt/yr. Major species are green (Perna viridis ) and horse mussels (Modiolus senhausenii ) making some 60% of total production. The other main types, in order, are short-necked clams (Paphia undulata ) ark shells (Andara granosa ) and oysters (Crassostrea sp.). Culture practices account for 80% of green mussel, cockle and oyster production.