to salvage; to dredge; to fish out (person or object from the sea)

lit. to fish a needle from the sea; to find a needle in a haystack (idiom)

to fish for (aquatic animals and plants); to catch

to dredge up; to scoop up from the water; to fish for; to gain (by improper means)

(slang) gold digger; woman who pursues men for money