My favorite way of getting these is to go in a narrow river. Then punch or hit a fish with a bat. They will all get scared and swim on to shore. They will die and you can walk around harvesting their boddies.
Guys, i was gettin thousands of fish meat on offical - the center.. i used my spino to kill the abundance of mantas that fallow the basilos.. you black bar so fast it will blow your mind... pro tip: use fish meat to raise babies.. it takes twice the time to spoil!
Begginer prime/normal fish meat requirements 1:raft 2:a few dodos 3:bow now get you and your dodos on the raft throw a dodo in the water swim around with the raft until a meg attacks your dodo then light the meg up