Structure and dynamics of the demersal resources of the Java Sea, 1975-1979
1996
Martosubroto, P. (FAO of the United Nations, Viale delle Terme di Caracalla 00100 Rome (Italy). Fishery Resources Div. Marine Resources Section)
The demersal fisheries of the Java Sea and their resource base were studied using commercial catch and effort data and the results of scientific surveys. Surplus production models were applied to the catch and effort data. Model results indicate that effort levels were near optimal in the late 1970s, except for the southeastern coast of Sumatra and northern coast of Java where, due to nearshore shrimp trawling, fishing effort was well above that required to generate maximum sustainable yield. A principal component analysis demonstrated that 76 percent and 65 percent of the changes among years of demersal resource abundance was explained by the first two principal components for the lightly exploited areas and the highly exploited areas, respectively. Among areas representing different levels of fishing pressure, no difference was detected in the number of taxonomic groups at each tropic level significantly contributing to the first two principal components. Overall, throughout the 1970s, no major changes occurred in the tropic structure of the demersal resources in the various areas of the Java Sea
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