International Pacific Halibut Commission International Pacific Halibut Commission The International Pacific Halibut Commission (IPHC) is an International Fisheries Organization, having Canada and the United States as its members, responsible for the management of stocks of Pacific halibut or "Hippoglossus stenolepis" within the Pacific waters of its member states. It was founded in 1923 by an international treaty. The original treaty has been revised three times (1953,1976,1979). The 1979 amendment clarified the role of the IPHC in the management of the fishery through the North Pacific Halibut Act of 1982. It has carried out many activities including the use of chartered commercial fishing vessels to
Fish anatomy and various processes which project from the centrum or arches. An arch extending from the top of the centrum is called a neural arch, while the hemal arch or chevron is found underneath the centrum in the caudal (tail) vertebrae of fish. The centrum of a fish is usually concave at each end (amphicoelous), which limits the motion of the fish. This can be contrasted with the centrum of a mammal, which is flat at each end (acoelous), shaped in a manner that can support and distribute compressive forces. The vertebrae of lobe-finned fishes consist of three discrete bony elements.