I found one answer last year, at a fish farm called Veta la Palma.

我去年在一个叫Veta la Palma鱼养殖场找到了一个答案。

youdao

In the warm enclosed waters of farm ponds, conditions are very likely to be lethal for fish when insecticides are applied in the vicinity.

当杀虫剂在农场附近池塘的温暖封闭水域使用时，环境很可能对鱼是致命的。

youdao

Trying to farm a fish just because there is an established market for it is a waste of time and money, argues Mr Greenberg.

Greenberg认为，仅凭市场对某种鱼类有需求就尝试去人工养殖，无非是在浪费时间和金钱。

youdao

Earlier this year, the firm won permission for a similarly large-scale fish farm on Loch Torridon in the north-west Highlands.

BBC: Scottish Salmon Company boosts capacity with Mull licence

At its 42-acre fish farm the company offers visitors a range of tours with different prices and perks.

FORBES: Companies, People, Ideas

Getting the required permits and licenses to operate a deep-water fish farm in the U.S. would require running the gantlet of dozens of federal and state regulatory agencies, some with overlapping jurisdictions and none with a mandate to lead the process.

FORBES: Regulatory Uncertainty Drives A Fish Farmer To Foreign Waters