Aurelia - the jelly fish notes -
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Notes-
Aurelia (Jellyfish). Part - 4
Circulation of water in Aurelia (Jellyfish)
Respiration and excretion of Aurelia (Jellyfish)
Circulation of water in Aurelia (Jellyfish)
The circulation of water is due to the beating of cilia of the gastrodermal cell
lining of the gastrovascular canal. It circulates through the gastrovascular
canal system along a fixed route.
The inhaled water current enters the mouth and passes through the narrow
gastrogenital canal into gastric pouches, and finally through the unbranched
adraial canal enters the circular canal.
From the circular canal, exhalent water current returns through perradail and
interradial canals.
The Preradial canal conveys it directly into the stomach from where it
passes into the gullet and finally exists along the basal grooves of oral arms.
Interradial canals convey it to the basal grooves of the oral
arms via exhalent and gastro-oral canals. This
arrangement greatly prevents the mixing of water currents
entering and leaving the gastrovascular canal system.
The contraction of the bell during locomotion and
movements of oral arms helps in circulation.
One complete circulation takes about 20 minutes.
The circulation of water helps in nutrition, respiration,
excretion, and reproduction.
Respiration and excretion of Aurelia (Jellyfish)
Aurelia has no special organs for respiration and excretion. Oxygen
dissolved into water diffuses directly into the epidermis as well s the
gastrodermis, both of which are constantly bathed by water.
Carbondioxide and nitrogenous wastes diffuse out into surrounding water.
Some workers are of the opinion that the subgenital pits facilitate gaseous
exchange. This is based on the observation that, at the time of swimming,
foul water constantly leaves the pits and freshwater with dissolved oxygen)
enters into them.
99% weight of jellyfish is formed by water.
Nothing is known about the nature of excretory products.
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