相模湾西湘地区定置網漁場における漁獲物組成からみた年次区分 The Yearly Similarities in Species Composition of Set-net Fishing Grounds in Seisyou Region of Sagami Bay
It is important to understand the characteristics of fishing conditions for each fishing ground in the Seisyou region of Sagami Bay in order to explain the mechanism of catch fluctuation. Species compositions of fish caught by six large-sized set-nets were analyzed by cluster analysis.<br>Yearly similarities in species composition by cluster analysis showed a tendency of dominant species catches. The trend varies a little, influenced by species composition for each fishing ground. Furthermore, the trend of the Seisyou region is generally influenced by the Komekami and Koyawata fishing grounds. The change of the set-net construction for the Iwae fishing ground, from trap net (1970-1983) to trap net with bottom-layer bag (1987-1993) had a great effect.
日本水産学会誌 63(6), 956-963, 1997-11-15