DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF THE FISHES

DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF THE FISHES

TERMS
DEFINITIONS
Ostracoderms bony armor fishes called ostracoderms
Agna bans Thejawless fishes are called agnathans
Aestivation Aestivation is a dormant state that helps an animal withstands hot. dry periods.
Homoccereal tail In this case, the tail fin has equal upper and lower lobes.
Caviar The eggs of sturgeons are caviar.
Ram ventilation Some fishes keep their mouths open during swimming. It maintains Water flow in the pharynx. This method is called ram ventilation.
Gill arches Gill arches support gills.
Gill filament Gill   filaments extend  from  each       gill    arch.     Gill  filament is composed pharyngeal lamellae
Counter current mechanism ‘The opposite flow, of blood and gases is called countercurrent mechanism.
Rete    mirabile Rete mirabile is a vascular network
Electroreception Electroreceptionis the detection of electrical                 fields     that    the


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fish or another organism generates in the environment.

Osmoregulation ‘The maintenance of water and salt balance in the body is called osmoregulation.
Excretion The removal of nitrogenous wastes from the body is called excretion.
Diadromous Diadromous fishes migrate between freshwater and marine environments.
Claspers Male elasmobranchs have modified pelvic fins called claspers.

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