Resource characteristics and environmental conditions of short necked clam, Ruditapes philippinarum in the seacoast of Hiroshima prefecture [Japan]
2007
Saito, H.(Hiroshima Univ., Higashihiroshima (Japan)) | Tomarino, Y. | Yamaji, M. | Kawai, K. | Imabayashi, H.
Resource characteristics and environmental conditions of Ruditapes philippinarum were investigated in stations of the seacoast of Hiroshima Bay and Bingo-Nada. In Hiroshima Bay, naturally recruited clams (shell length: 20 mm) were abundant (= 40 ind./0.1 square m) at the inner part, and were scarce (20 ind./0.1 square m) at the central part. However, distributional pattern of the clam did not clear in Bingo-Nada. Sharpness index (shell width/shell length) of the clams was negatively correlated with the condition factor (soft body weight/(shell length x shell height x shell width x 100)). The condition factors were higher (=15) in all stations of Hiroshima Bay, while the higher values were showed only in the eastern part of Bingo-Nada. Condition score of the clam derived from mean score of density, condition factor and relative number of clam, increased with increasing in condition score of environment evaluated as mean score of bottom mud and very coarse sand content, ignition loss, seawater chlorophyll-a and number of Asian mussel in Bingo-Nada, but not in Hiroshima Bay.
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