Fairy Godfather

"Good morning, LuLu! Come here, let me show you one thing, I think something weird happened last night."

Prancer woke up early this morning, even before the sun showed up, so he had time to go to the creek and check the traps we put back last night. When I got up, he took one of the traps back to our yard and handed it to me.

"Good morning, Prancer. You were up so early today! What is the problem?"

Taking over the basket, I observed it carefully: the trap looks good from the outside, but it was very heavy and seemed like it carries a big amount of fish. Looking inside the basket, wow — more than ten fish were overcrowdedly squeezed together in this small space. 

That was unusual: if the fish swim into the trap naturally, this trap can only contain about six fish to its greatest extent. This situation was more likely to be a case in which someone forcibly pushed those fish into the trap.

But, who would do this thing?