cartilaginous fish,chondrichthian- fishes in which the skeleton may be calcified but not ossified Holocephali,subclass Holocephali- chimaeras and extinct forms Elasmobranchii,Selachii,subclass Elasmobranchii,subclass Selachii- sharks; rays; dogfishes; skates ...
particularly to the understanding of food chains and predator-prey relationships. Marine biological information on the distribution offishand crustacean populations is of great importance to fisheries. Marine biology is also concerned with the effects of certain forms ofpollutionon the fish and plant life...