失水的鱼
[shī shuĭ de yú]
A fish cannot live long out of water. By taking such a moniker, this person may express that they're struggling in some circumstances without necessary supports, feeling desperate as if it were suffocating, hoping one day to be able to jump into a 'suitable river'. Alternatively, 'the Fish out of Water' also means feeling uncomfortable due to unfamiliarity with new conditions.