Why do frozen fishes have incision in the body?

Why do frozen fishes have incision in the body? - Laughing female friends in warm clothes standing near stone wall covered with snow and playing snowballs in winter

I've bought a lot of frozen fishes say a pompano or mackerels. I've noticed that whenever i defrost the fishes, all of them have a small incision in the stomach and these fishes are almost never bled out. Can someone tell me why is there an incision? Because it makes cleaning a lot harder for me.






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Why do frozen fishes have incision in the body? - Unrecognizable kids with mother playing on icy river in park
Why do frozen fishes have incision in the body? - Woods Covered With Snow
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