Fish up is a phrasal verb that could be replaced with a variety of synonyms to lend diversity to your writing. To catch or retrieve fish from water, you could use hook or net. To fish up information or discover something, you could use uncover, unearth, or expose. To fish up something from a hidden place, you can use dig up, excavate, or disinter. Some additional synonyms of fish up related to the context include dredge up, retrieve, recover, and salvage. Whether you're writing an essay, a novel, or a casual email, these alternatives to fish up will add nuances to your prose and make your writing more dynamic.