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Relations of fluctuations in standing crop of kuruma prawn among the fisheries along the buzen district.

1981; Springer Science+Business Media; Volume: 47; Issue: 5 Linguagem: Inglês

10.2331/suisan.47.585

1349-998X

Takeru Kitahara,

Marine and fisheries research

This paper treated relations of fluctuations in the standing crop of kuruma prawn Penaeus Japoncus among the set net, gillnet and small boat seine fisheries in the fishing area around Minosima, Fukuoka, to clarify their qualitative characters for the purpose of deriving a method for analysing quantitatively such relations in future. A log transformed standing crop index of the prawn was expressed by the moving average of log transformed catch per unit effort of 9 2-days. Among the three fisheries, a relation of long-term changes in their index was not alway constant in the season and hence was non-stationary. An analysis of short-term changes in the index gave the following results. The index for the gillnet fishery changed nearly synchronously with that for the set net fishery in a short term but the short-term change in the former seemed to occur somewhat later than one in the other. The index for the small boat seine fishery changed behind that for the set net and gillnet fisheries by 6-9 and 4-6 2-days, respectively, in a short-term. The respective time lage between two of the three fisheries seemed to correspond roughly to the distances between their fishing areas.