The general characteristics of Pisces are as follows :
1.
Habitat : They
are completely aquatic found in marine or freshwater. They are cold blooded
(poikilothermic) animals.
2. Body form : They have streamlined body or boat shaped
and laterally compressed. Body is covered by cycloid or placetoid scales.
3. Locomotion : Locomotion in Pisces is performed by
paired fins (pelvic, pectorial fins) and unpaired fins (anal , dorsal , caudal
fins).
4. Respiration : They respire through gills. Gills may or may not be covered by
operculum.
5. Swim bladder
may or may not be present and they two chambered heart.
6. Reproduction system : Sexes are separate in them (diocoius) and some show sexual
dimorphism like cartilaginous fish and some don't like bony fish. Those who
show sexual dimorphism have clasper for transferring sperm to female genital
tract.
7. Development is
direct and fertilization in Pisces is both internal and external.
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