Question

Induced breeding is effective in which of them?
A. Pisciculture
B. Sericulture
C. Apiculture
D. Lac culture

Answer 1

Hint: The induced breeding is performed due to several environmental conditions like temperature, pH, rain, photoperiod, insufficient hormone release, and insufficient nutrient supply.

Complete answer:
Induced breeding is one of the dependable sources of quality seed supply is by inducing major carps to breed in ponds by the use of pituitary hormone injections. In many countries, pituitary extract for inducing fish to breed is used commonly.
The economically important fish which do not breed in some conditions can breed through artificial conditions in induced breeding. The cost of seed production by induced breeding is very low as compared to the natural resources.
So, the induced breeding is quite effective in pisciculture as it is an artificial process in which the pituitary gland is collected from the mature fish or donor fish and introduced into the body of the male and female fishes, as a result, fishes lay eggs in the pond water and fertilization takes place.
The most commonly used donor fish is common carp, Cyprinus carpio. The Indian major carps like Catla catla, Labeo calbasu, Labeo gonius, Labeo rohita, and Cirrhinus mrigala do not breed in confined water, so induced breeding is necessary.
Advantages of Induced breeding are as follows-
> The availability of seed spawn is always there, whereas it is uncertain from natural resources.
> The pure spawn is always available whereas spawn obtained from the river is mixed with other species.
> The required quantity is always available.

So, the correct answer is option A.

Additional information: Precautions should be taken to induce breeding such as-
> The breeders should be properly washed with potassium permanganate for a few minutes to avoid diseases and any parasitic infections.
> The breeder should be protected from any mechanical injuries during handling.
> The favorable conditions for the temperature of the water should be $24$ to ${310^ \circ }C$ and turbidity about 100-1000 ppm.
> The pituitary glands taken from the same or related species as the recipient species are said to be more effective.

Note: The synthetic hormones of fish spawning as the pituitary hormone substitute used in induced breeding are ovaprim and ovatide.
The spawning of fish can be influenced by climate, flowing water, turbidity (100ppm-1000ppm), and light. The light drizzling followed by heavy rain is the ideal condition.