Final answer:
Fin fish have less collagen compared to mammals, with bony fish having ossified skeletons and exceptions like sturgeons and paddlefish having cartilaginous skeletons. Collagen is found in skin, bone, and cartilage. Concerns over fish population sustainability highlight the importance of fish as a primary source of protein.
Step-by-step explanation:
Collagen Content in Fin Fish
Fin fish typically have less collagen in comparison to mammals. Collagen is a major protein found extensively in various tissues including skin, bone, and cartilage. Bony fishes, which constitute a large portion of fin fish, have an ossified skeleton rich in a calcium phosphate matrix, produced and maintained by osteocytes.
These bony structures are different from the collagen-rich structures found in mammals. Exceptions within the fish community, such as sturgeons and paddlefish, have reverted to primarily cartilaginous skeletons.
Moreover, the environmental impact on fisheries leads to concerns over fish population sustainability and the critical role of fish as a main source of animal protein for billions of people.