It's a whopper!

Wouldn't it be dangerous for her to go fishing, especially when most fishes would be the size of a whale to her, as well as probably try to eat her if given a chance?

Keo said:

Wouldn't it be dangerous for her to go fishing, especially when most fishes would be the size of a whale to her, as well as probably try to eat her if given a chance?

Hence Nitori's reaction. This fish is as big as she is.

Shinmyoumaru is delightfully often depicted doing something f*kken awesome like here. I approve much! She's my favourite of the more recent characters.

Nitori: "Eh..EHHH?!"