somehow no fish is spawning ( even dolphin)

**Formerly, i was playing with my friends in a minecraft 1.13 server ,we caught some fishes to build an aquarium. Later, when i updated it into 1.14 , there seem to be some problem as no fish occur ( except for those we caught earlier ). I thought it was because of the version so i updated 1.14.3 but no help . Somehow when i check it in single-player, fish seems to spawn. I don't know what to do , please help.