Linked from
The 18 pages that link to Fish gill, each with the reason it gives.
TeleostRelated: Teleost gills also help regulate ions and remove nitrogenous waste.
Ram feedingRelated: In many fishes, water taken in during feeding also passes toward the gills.
European perchRelated: Gill structure underlies the perch's ability to breathe while submerged.
Ocean sunfishRelated: Gills supply oxygen during the sunfish’s long dives and surface activity.
ArapaimaRelated: Arapaima retain gills, but rely on them less than most fishes as they grow.
ArgulidaeRelated: Some argulids attach near gills, where feeding can injure delicate tissue.
TarponRelated: Gills provide tarpon with their ordinary aquatic respiration alongside air gulping.