I mean, when did you last have a fish hold your hand.

我是说，你上次把鱼放手里是什么时候。

They're also fish holding pens with different-height walls for storage, designed to change the way the water moves and to be able to store big fish and little fish and to keep those fish in cool, clear running water.

它们也是具有不同高度壁的鱼圈，用于储存，旨在改变水流的方式， 能够储存大鱼和小鱼， 并将这些鱼保持在凉爽、清澈的自来水中。