REN R205 Study Guide - Quiz Guide: Gnathostomata, Goldeye, Acipenseriformes
6 Apr 2016
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Lab 6: north american freshwater fishes: class cephalaspidomorpha, jawless fishes, class actinopterygii, jawed fishes, with real bones a. i. Contains 90% of all the living fishes a. ii. Order only no families in this lab. Annuli on hard (boney) structures and circuli on scales. Summer growth of bone= dense wide bands (opaque zone); Winter growth is narrow and less dense (hyaline zone) General anatomy of a fish (showing a salmonid) Most predators have nice notched, symmetrical tails fishes. Eel-shaped, rounded mouth to sucker onto fish to feed off blood. Class actinopterygii ray-finned bony fishes real bones in their skeletons fines are made from fin rays, without a fleshly lobe at the base. Bony plates (scutes) along sides and top of body. Swim with mouth open, feed on plankton (filter feeders) Paddle-like structure off front of upper jaw (sensory organs) Skeleton mostly cartilage, but skull strong and bony. Ferocious predators of other fish, lots of teeth.
