DR. Rakesh Kumar

Assistant Prof.

DEPARTMENT .OF ZOOLOGY

JCDAV College Dasuya,

Distt Hoshiarpur, Pb-144205

Sorting out of desirable fish seed from mixed collection made from field at early fry stage is a cumbersome job.

Fish seed collection centres are located at faraway places, so there are problems for transportation as well as there is high mortality.

Dearth of fish seed for stocking ponds is a persistent problem

Major carps do not breed in confined waters as they are essentially riverine fishes.

“The process of producing quality fish seed by inducing major carps to breed in ponds by use of pituitary

hormone injections is called as INDUCED BREEDING”

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1. Collection of eggs is a cumbersome process.

1. During collection, unwanted fish spawns arealso collected.

1. Survival of hatchlings up to fry stage is poor.

1. Pituitary gland secretes the FSH and the LH which play animportant role in the development and maturity of gonadsleading to spawning in fishes.

1. External environmental factors like Temperature, rain waterand light induce these hormones to be released, thusregulating the reproductive cycle of the fish.

1. POTENCY OF PITUITARY GLAND – greatest in the ripe fishand almost nil when the fish has spawned, therefore thecollection of pituitary starts at the begining of the maturityseason.

1. Preferably from a fresh fish.

2. Donor should be of same species again preferably

3. Damage to the pituitary should beminimum.

4. Preservation in absolute alcohol – Changes for longerpreservation.

5. To make injections, glands put on a filter paper, dried,weighed and then homogenized. Distilled water is used tomake the solution. Weight of gland and volume is recorded.

TOTAL DOSAGE (per kg bodyweight)

5-10mg for females

2-6mg formales

DOSAGE – Single or double

Females - 2-3 mg – preparatory dose/5-6 hrs./5-6mg

Males – Single dose only generally, 2-3 mg

Exotics – 3-5mg for males, 3-5mg & 5-10mg forfemales

TEMPERATURE – 24-310C

Human Chorionic Gonadotropin (HCG)

HCG + Pituitary extracts

Ovaprim –a synthetic chemical substance

Ovatide – another synthetic chemical

Dosage of Ovaprim for Catla - 0.40-0.50

Rohu - 0.30-0.40

Mrigal - 0.25-0.30

Silver carp - 0.40-0.70Grass carp - 0.40-0.80

RELEASE OF THE INJECTED BROODERS INTO BREEDING HAPAS

STRIPPING LEADING TO FERTILIZED EGGS

SPAWN - Up to 15mm (Family/Genera)

FRY - 16-50mm (Species)

FINGERLING - 50-100mm (All adult characters)

ADV. FINGERLING - 101-300mm (Ideal for stocking)

ADULT FISH - >>>>>>>>>>

PRE-SOCKING MANAGEMENT – removal of aquatic weeds andunwanted fish, manuring of the pond with organics

POST STOCKING MANAGEMENT – Supplementary feeding, DOlevels and continuous analysis of the pond forwater quality.