Subject: fishery

Stripping the female fish

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FISHERY SS2 WEEK 10 3RD TERM 2019 2020

Fertilization
Incubation

Stripping the female fish:
As soon as you notice the female fish starts releasing eggs, the appropriate time for stripping is ripe: the following procedures is engaged.
• With a net, gently remove the fish from the water and place it inside a big plastic basin, that is damp, but without water, placed on the floor in the middle of two people, sitting opposite each other.
• Keep a medium sized plastic bowl where the eggs will be stripped, ready at hand.
• Using two wet napkins, the two people should grip the fish, one by the head and the other by the tail, with its stomach facing down. Make sure you grip the fish tightly, because it will try to free itself, if you permit the struggle, it may hit the egg bowl and eggs may spill on the floor and waste.
• A third person should place the medium sized bowl inside the big plastic basin with the fish held over it such that the person holding the head of the fish and gently press its tommy with the other hand so that the eggs can drop inside the medium bowl.
• Keep pressing until the protruding tommy becomes flat and all the eggs are released. However, as soon as you notice blood coming out with the eggs, stop extracting the eggs.
Fertilization:

As soon as you stop stripping the eggs, pick up the sperm (milt) sack which is in a plate by the side, with the tissue paper wrapped around, follow the following procedure.
• Gently wrap the tissue, remove the sperm sack, using a new blade, cut the zig-zag end of the sack directly in the bowl of female eggs and the other person simultaneously rinses the milky sperm coming out from the sperm sack to the bowl of eggs. Rinsing solution be with saline solution.
• The solution of eggs, sperm and saline should not be too watery or thick. Just a solution that one can conveniently spread inside the vat with ease.
• Immediately after rinsing the sperm out of the sack, throw away the empty sack and mix the solution with turkey or chicken feather.
• Mixing should be done for exactly two minutes and then gently spread the solution in the vat that has been prepared for it using feather.
Incubation:
After spreading the solution in the vat, the vat is then covered with dark cloth that can allow aeration. The period of incubation last 30hrs from the time you covered vat, then after 30hrs, open the pond to see the result of hatching.
Note:
During rainy season, you may wish to wait for 48hrs before opening the vat, but ensure that the water is changed at the stipulated 30hrs, from experience it seems it takes longer time.

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