水がきれいになり過ぎて、魚が住めない？――。 瀬戸内海で魚介類の漁獲量が減り続け、漁師らから、こんな声が上がっている。水質改善が進んだことで、植物プランクトンを育てる窒素やリンなどの「栄養塩」が減り過ぎたことが一因と分析する研究者もおり、国も実態解明に乗り出した。 ◆「もうけがない」 関西空港に近い泉佐野漁港（大阪府泉佐野市）。瀬戸内海での８時間の底引き漁から戻ってきた男性（３８）は、浮かない表情を見せた。この日はカレイやヒラメ、エビなどが取れたが、数はどれも少ない。 「１０年前は１日に７～８万円分の水揚げがあったのに、今は２万円程度。船の燃料代も高いし、ほとんどもうけはない」 農林水産統計などによると、瀬戸内海の漁獲量は１９８２年の４６万トンをピークに減少し、２０１０年は１７万５０００トンまで落ち込んだ。８０年代に比べ、カレイ類が２分の１、イカナゴは６分の１に。アサリ類は約１９０分の１に
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