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The culture of tilapia in seawater (mariculture) is often difficult because the fish tend to be more sensitive to handling stress than those cultured in freshwater. Late in 1977, KISR imported tilapia, a group of freshwater African fishes, for test culture in Kuwait. Certain species are known to survive in seawater (Lotan, 1960; Canar-garatnam, 1966); these fish are very hardy and spawn readily (Balarin and Hatton, 1970; Pullin and Lowe-McConnell, 1981).

A procedure is proposed by which recruit numbers and parental biomass of shrimps stocks can be derived, given a series of catch-per-effort data and estimates of a few ancillary variables. In the Gulf of Thailand, shrimp recruitment decreased with decreasing egg production, but increased with decreasing total (mainly fish) standing stock. The net result of these counteracting effects was an overall increase in shrimp recruitment, attributable to a greatly reduced prerecruit mortality.