It's true for many mainland farms, especially those raising eel.
内地有些养殖场的确是这样，尤其是那些养鳗鱼的地方。
youdao
It is true. Next he is catching eel to prevent him to run with a hand.
是真的。然后他用一只手抓着鳗鱼防止他跑掉。
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