Bull Trout (Salvelinus confluentus) are a long lived, apex predator native to the Pacific Northwest, migrating from tiny tributaries to main stem sections throughout the changing seasons. Known for their aggressive nature by fly fishermen, underwater they are calm and confident.
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Vancouver Aquarium head veterinarian Dr. Martin Haulena, with help from Dr. Lesanna Lahner of Seattle Aquarium, affixes a prosthetic eye on a yellowtail rockfish (Sebastes flavidus) that had its eye removed due to cataracts. They performed the same surgery on a second rockfish, a copper rockfish (Sebastes caurinus), seen at the end of this video. The purpose of this procedure is partly cosmetic and partly for the fish’s welfare. Without an eye, the other fishes would act aggressively towards it for seeming sick and weak.
(via: Scientific American)