Download Bony Fish

Lab. -13-
Bony fishes
Practical Biology
*Respiratory system
The fish use gills for gas exchange, the gills consists of gill-arches, gill- filaments
and gill-rakers.
*Circulatory system
The circulatory system consists of a heart, blood vessels, and blood. The heart of a
bony fish has two chambers (one atrium one ventricle) with sinus venosus and conus
arteriosus.
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*Nervous system
The nervous system of a bony fish includes the brain, spinal cord, nerves, and
various sensory organs.
*Excretory system
The excretory system of fish consists of two elongated kidney, two short
mesonephric duct (the two ducts unite after leaving the kidney to form a common
mesonephric duct), small urinary bladder and urogenital papilla.
*Reproduction system
The Reproductive behavior in bony fishes is called spawning and the Fertilization
in most fish takes place outside the body (external fertilization), the male
reproductive system in bony fish consists of two testes, vas deference and open on
urogenital papilla, either the female reproductive system consists of two ovaries,
oviduct and open on genital papilla.
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