Its easily possible. Specially if he was at a catfish farm, and they let him free fish until night time.(prob paid them to do so) Also possible in the wild, if he was with like 2 other people and they added their catches together(also a possibility here), 'cause me and my cousins be catching a shyt ton of fish before we'd leave to go home, but we start early in the morning, like 9-am and leave around 7pm
Edit:
Also nikkas that really fish know you fish with more than one fishing pole, that ups your chances even quicker.