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Catfish Production: Fertilization and Incubation of fertilized eggs

Fertilization and Incubation of fertilized eggs of Catfish

Catfish Production: Fertilization and Incubation of fertilized eggs
Catfish Production: Fertilization and Incubation of fertilized eggs

Catfish Production

Today we will be discussing catfish production. I will only share with you artificial reproduction in this post and practice is very effective in the production of catfish. Before the production of catfish, the following are to be ready:

· Female brood-stock
· Male brood-stock
· Ovaprim
· Saline
· Mesh net

Female brood-stock

Matured female fish are selected according to the following criteria:
A well-distended, swollen abdomen, sometimes reddish or rose-coloured genital papilla from which ripe eggs can be obtained by slightly pressing the abdomen towards the genital papilla.

Also Read: Cannibalism in Catfish and How to Reduce

Male brood-stock

Mostly males that above 1k can be used in fish production, ideally male fish should be larger than 500 grams and not less than 71/2 months.

Ovaprim

Is the hormone used on the farm and is administered at 0.5m per 1 kilogram of fish body weight. This is the most common hormone used by fish farmers in the Southern region.

Saline
Preparation of saline
Preparation of saline (with salt and water)

This is prepared by mixing 9 grams of NaCl with 1 liter of boiled water or prepared. It is also sold in the market

Mesh net
Mesh net
Mesh net

This is made up of plastic pipe and a net (size 1mm).

Administration of Hormone

The most common method of administering the hormone is by intra-muscular injection into the dorsal muscle. The females are injected in the evening and are kept (separated from the males) in the holding facility.

Administration of hormone in catfish dorsally
Administration of hormone in catfish dorsally

Note: Cover the head of the breeder with a towel in order to keep it quiet during the injection. In general most fish keep still if their eyes are covered and the holding facility in which they are separated can be a simple plastic bucket, vat, or a half oil drum e.t.c for easy cash in the morning so as to avoid spoilage of eggs.

The time between injection and stripping depends on the water temperature.

The time it takes an egg to ovulate in accordance with temperature is presented below:

WATER TEMPERATURE
TIME BETWEEN INJECTIONS AND STRIPPING (HOURS)
20
21
21
18
22
15.5
23
13.5
24
12
25
11
26
10
27
9
28
8
29
7.5

Extraction of Sperm

Milt extraction process
Milt extraction process

The milt is taken from a male spawner and diluted with a physiological salt solution (9g of kitchen salt (NaCl) dissolved in 1 liter of boiled water) about half an hour before the females are stripped.

Stripping
stripping
stripping the female catfish

Stripping of the female spawners is carried out by gently pressing their abdomen with a thumb from the pectoral fin towards the genital papilla.

Fertilization process of stripped Eggs

The sperm is added to the stripped eggs, is mixed with the eggs by gently shaking the bowl they become fertilized and an equal volume of water is added to the eggs to enable the damaged eggs to flow on the water then we decant.

Note: Eggs must be stirred continuously until they are placed in the hatching tanks reason is that the eggs become sticky and without stirring it will stick together into one clump. About 60 seconds after fertilization has taken place the sperm lost its activities; the fertilized eggs are then ready for incubation.

Incubation of fertilized eggs

The eggs are spread out on a screen (mesh size 1mm) which is placed in the hatchery and this process is called Casting.

Incubating of eggs by casting it on a mesh net
Incubating of eggs by casting it on a mesh net

This method works well as the hatched fish will pass through the screen living the dead eggs and shells on the screen, the screen is removed from the basin separating the hatched fish and dead eggs

Time interval of incubation in relation to water temperature:


WATER TEMPERATURE IN CELSIUS
TIME INTERVAL OF INCUBATION (HOURS)
20
57
21
46
22
38
23
33
24
29
25
27
26
25
27
23
28
22
29
21
30
20

Ozochima

I am an enthusiastic, self-motivated, reliable, hard working and well organised professional person. I am a good listener and flexible individual who can learn new skills easily and execute them swiftly. I obtain my degrees at the University of Nigeria, Nsukka and Madanta Institute, India.

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