Sockeye salmon ocean and live their entire lives in freshwater. Sockeye salmon is the third-most common Pacific salmon species, after pink and chum salmon. "Oncorhynchus" comes from the Greek ὄγκος (onkos) meaning "barb", and ῥύγχος (rhynchos) meaning "snout". "Nerka" is the Russian name for the anadromous form. The name "sockeye" is an anglicization of "suk-kegh" (sθə́qəy̓), its name in Halkomelem, the language of the indigenous people along the lower reaches of the Fraser River (one of British Columbia's many native Coast Salish languages). "Suk-kegh" means "red fish". The sockeye salmon is sometimes called red or blueback salmon, due to its color. Sockeye
Pain in fish that the absence of C-type fibres in cartilagenous sharks and rays indicates that signalling leading to pain perception is likely to be impossible, and the low numbers for bony fish (e.g. 5% for carp and trout) indicate this is also highly unlikely for these fish. Rose concludes there is little evidence that sharks and rays possess the nociceptors required to initiate pain detection in the brain, and that, while bony fish are able to unconsciously learn to avoid injurious stimuli, they are little more likely to experience conscious pain than sharks. A-delta-type fibres, believed to trigger avoidance reactions, are common