Ankara Üniversitesi Açık Ders Malzemeleri

FISH BIOLOGY

Fishes are aquatic organisms, respire with gills and move with the help of

fins. The golden age of fishes is Devonian period. Fishes are cold blooded

animals. The body is covered with scales. Fishes consist of paired pectoral

and pelvic fins) and unpaired (dorsal, anal and caudal fins) fin; the tail is

useful for changing directions, gaseous exchange takes place in gill lamella

and accessory respiratory organs are found in few fishes. Two chambered

venous heart is found in fishes. Mesonephric kidney is responsible for excreting

ammonia. Sexes are separate and direct development.