When provided four Classes of GAS i

When provided four Classes of GAS in the same
arena of aquarium, the juvenile turtles preferred to eat
young snails (Class I and Class II), and only 3.4 % Class
III snails in total snails were attacked and Class IV was
not consumed. For adult turtles, all classes of GAS can be
consumed when provided with a mixture of four Classes
of snails. The developing turtles had a higher predatory
capacity of Class I and II snails than developed turtles,
while the developed turtles showed a higher predatory
capacity of Class III and IV snails, which occupied 11.8
% in total snails. For Class IV snails, there was no difference
of predatory capacity between developing and developed
turtles. Therefore, it was concluded that the turtle’s
predatory selectivity for in a decreasing order
was juvenile turtles > developing turtles > developed
turtles, which was opposite to the order of predatory capacity.
To balance the predatory capacity and selectivity
of P. sinensis on the developing turtles were recommended
for the field trials