A PRACTICAL METHOD FOR HATCHERY OF LOCAL CATFISH


WHAT IS THE MAIN AIM OF THE PRACTICAL
The major objective of the practical is to
(1) Impact the knowledge of artificial induced breeding to learners and beginners.
(2) For first time learners to know that is better and more reliable because
(i) better rate of fertilization and hatching will be achieved.
(ii) protection against enemies and unfavorable environmental condition.

(iii) better condition for growth and survival.

PROCEDURE INVOLVED IN FISH BREEDING
(1) Selection of brood stock from fish pond.
(2) Inducing final maturation and ovulation with hormone treatment.
(3) Procurement of ripe eggs by stripping.
(4) Procurement of milt by dissection of male donor.
(5) Artificial fertilization.
(6) Rearing of larvae or fry.

SELECTION OF BROODSTOCK FROM FISH POND
The brood stock was selected and kept in plastic tank filled with water. The female breeder showed the maturity by bringing out a brighter colour and the abdomen, was swollen, lighter brownish in colour, when applied pressure on the abdomen, some eggs quickly come out with light green and a dot in the middle. In the male breeder, the genital papillae was elongated dark and slightly swollen.

INDUCED FINAL MATURATION AND OVULATION WITH HORMONE
On the next day, the breeder was brought out of tank and placed on top of the table by 8:05am to weigh by the use of weighing scale.

·      The male brood stock weighed 2.0kg
·      The female brood stock weighed 3.0kg.
·      The temperature of the environment is 28 degree cen.
·      The temperature of water 27 degree cen.
·      The female breeder was injected with ovaprim (1.5mm) dose by 8:12am intra muscularly at angle 45 degree above the lateral line and above the dorsal fin.
·      The latency period was 8 hours (time of injection and ovulation).

PROCUREMENT OF MILT BY DISSECTION OF A MALE DONOR
The male was dissected and to obtain the tastes which are located at the dorsal part of abdominal cavity of the male. The milt was obtained from the tastes by cutting little incisions in the external part of the lobules. The milt was preserved temporally in glass cup and covered.

PROCUREMENT OF THE RIP EGG BY STRIPPING
The ovulated eggs in the female breeder was obtained when the eggs ripped.
The ovulation period reached by 5:15pm. The belly was thick and soft.
Two person held the fish with wet towel to avoid injury to the fish.
The ventral side of the fish was dried up with toilet tissue and gently pressed towards the genital papillae to extrude the eggs.

ARTIFICIAL FERTILIZATION
We used dry method of fertilization by adding the milt on the stripped eggs and few drops saline solution to ensure proper mixing of the sexual product through gentle shaking of the bowel and stirred
.
INCUBATION AND HATCHING OF FRY
We washed the plastic bowel and filled close to the brim with clean water. The fertilized eggs were spread homogenously in a single layer on a kakaban (mosquito netting material placed on top of the water in bowel.

LARVAL REARING
We separated the larvae from egg shell and un-hatched eggs. The kakaban was removed which helped in separating the larvae from the shell. The remaining un-hatched eggs were removed by siphoning.

NURSING (FEEDING) FRY
Feeding started after the third day of hatching, we introduced Artemia naupilli. We fed with Artemia for seven days before changing to 0.3mm artificial feed after four weeks we got fingerlings for stocking. FOR MORE INFORMATION OR POND CONSTRUTION YOU CAN BUY OUR E-BOOKS OR CALL US ON 08032861326. ORDER NOW!.




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