Changes in catch volume over time. A large catch is said to indicate good fishing conditions. Fishing conditions can fluctuate over short periods within the same year, or over time. Causes include changes in resource abundance and changes in migration routes due to changes in ocean conditions. The expression "schools of fish gather at the tides" aptly describes the relationship between fishing conditions and ocean conditions. The waters off Japan, the North Sea, and the waters off Newfoundland in North America are said to be the world's three largest fishing grounds, and all of these are areas where warm and cold currents collide. Changes in ocean conditions affect fishing conditions, and abnormal ocean conditions deal a major blow to fishing conditions. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
漁獲量の時間的な変化の状況。漁獲高が多いと漁況がよいという。漁況は,同一年内の短期間でも,あるいは経年的にも変動する。その原因として,資源量の変動,海況の変動による回遊経路の変化などがあげられる。「魚群は潮目に集る」という言葉は漁況と海況の関係をよく表現したもので,日本近海,北海,北アメリカのニューファンドランド近海は世界の三大漁場といわれるが,いずれも暖流と寒流の衝突する海域である。海況の変動は漁況に影響を与え,海況の異常は漁況に大きな打撃を与える。
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