Self-contamination

Japanese: 自家汚染 - じかおせん

This term is used to describe the environmental pollution of water areas caused by fish and shellfish farming from the perspective of the fishing industry. Aquaculture farms that use shallow coastal waters or rivers and lakes can be damaged by pollution from land, such as industrial and domestic wastewater. On the other hand, as aquaculture becomes more intensive, the accumulation of excrement from farmed organisms and residues of feed can exceed the natural purification capacity, causing deterioration of water quality and bottom sediment, and as a result, reducing aquaculture productivity. In shallow water oyster farms and Akoya pearl farms, repeated use of a certain location can gradually lead to poor growth and meat content of the oysters, and a decline in the quality of the pearls.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

魚介類の養殖に伴う水域の環境汚染を水産業の立場から表現したことばである。沿岸浅海や河川湖沼を利用した養殖場は，産業廃水や生活廃水など陸上からの汚染によって被害を受けることがある。一方，養殖の集約化が進むと養殖生物の排泄物や餌の残滓（ざんし）の堆積量が自然のもつ浄化能力を超えるようになり，水質や底質を悪化させ，その結果，養殖の生産性も低下する。浅海のカキ養殖場やアコヤガイ(真珠)養殖場では，ある場所を繰り返し利用しているとしだいに成長や身入りが悪くなったり，真珠の品質が低下する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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