There's been excessive use of chemicals, there's been virus and disease transfered to wild populations, ecosystem destruction and pollution, escaped fish breeding with wild populations, altering the overall genetic pool, and then of course, as just mentioned, the unsustainable feed ingredients.
它们过量使用化学剂量， 已经有病毒和疾病传染给野生的物种， 生态被破坏和污染， 逃离的鱼类和野生物种繁殖后代， 改变了原本的基因库， 然后，如刚刚所说的， 不稳定的喂养因素。