Seasonal Occurrence of Large-sized Black Porgy, Acanthopagrus schlegelii in an Intertidal Short-neck Clam Fishery Ground in Hiroshima Bay, Japan

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  • 瀬戸内海広島湾のアサリ漁場の干潟における大型クロダイAcanthopagrus schlegelii（タイ科）の出現の季節変化
  • セトナイカイ ヒロシマワン ノ アサリ ギョジョウ ノ ヒガタ ニ オケル オオガタ クロダイ Acanthopagrus schlegelii(タイカ)ノ シュツゲン ノ キセツ ヘンカ

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Abstract

Black porgy, Acanthopagrus schlegelii (Family: Sparidae), is a commercially important fish in Japan. This species is known as a major predator of the short-neck clam Ruditapes philippinarum in tidal flats. Seasonal occurrence of large fishes such as the porgy was investigated from February 2003 to January 2004 at the Maegata tidal flat, which has the largest catch of short-neck clam in Hiroshima Bay, western Seto Inland Sea. As a result, 73 individuals from nine species were collected by monthly gill net sampling. A. schlegelii, 23.6-48.5 cm total length was the dominant species and accounted for 79% of the total individuals. The catch per unit effort (CPUE: number of fish caught/300 m of netting) of the porgy was 0–18.8. The CPUE rapidly increased in late June. In late July, it reached 18.8, the highest annual value, after which the CPUE maintained high values during late August and late September. From late November values were low (0-3.0) again. These results indicate that large-sized A. schlegelii occur seasonally in the tidal flats from late June to late October.

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