The noun CERVIX has 2 senses: 1. the part of an organism that connects the head to the rest of the body. 2. necklike opening to the uterus. Familiarity information: CERVIX used as a noun is rare.
The United States Food and Drug Administration recommends cooking salmon to an internal temperature of 145 degrees Fahrenheit. Push the tip of the meat thermometer gently into the middle of the salmon fillet at its thickest part. Ideally, start checking the internal temperature a few minutes before the salmon fillet should be done cooking -- this prevents you from overcooking the fish. Once your salmon is cooked, clean the meat thermometer with hot water and soap to prevent cross-contamination.
Fish has always had one temperature for being done. The internal temperature for a done fish should be 145 degrees. At this temperature the fish should be opaque throughout and flake easily when tested with a fork. Like you, I prefer my Salmon to be medium, so the internal temperature will not be 145. As far as the internal temperature for other fish. I think you will need to test some fish to find the right internal temperature for the way you like your fish cooked. I know that on Cod and Halibut, I under cook mine a little so it is moister. But I never have checked the temperature, but will next time.