鱼类骨骼的主要功能在于支持身体、保护软骨器官以及配合肌肉产生各种形式的动作。鱼类的骨骼，按照功能和着生部位可分为外骨骼和内骨骼；外骨骼指鳞片和鳍条，内骨骼指头骨、脊椎和附肢骨骼。鱼类的骨骼按其性质来分，有软骨和硬骨两大类。但绝大多数鱼类的骨骼是硬骨。圆口? The main function of fish skeletons is to support the body, protect the cartilage organs and with the muscles to produce various forms of action. Fish bones, according to the function and the site of birth can be divided into exoskeleton and endoskeleton; exoskeleton refers to the scales and rays, endoskeleton refers to the skull, spine and appendage skeleton. Fish bones according to their nature to points, there are two major categories of cartilage and hard bone. But the skeleton of most fish is hard bones. Round mouth?