what does "hatch" mean in the following sentence? Can't feel it right, thanks.
Poached salmon was suddenly swimming down the wrong hatch.
(My understanding, I know it probably means the topic has changed, but I just can't literally perceive each word to make the big picture)

Question

what does "hatch" mean in the following sentence? Can't feel it right, thanks.
Poached salmon was suddenly swimming down the wrong hatch. 
 (My understanding, I know it probably means the topic has changed, but I just can't literally perceive each word to make the big picture)

Answer

It's  like saying it went the wrong way.

https://idioms.thefreedictionary.com/down+the+hatch

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