Earth ponds and Cages
Tilapia Fish Farming & Marketing
By Uri Ben Israel an Aquaqulture expert
By choosing this method your aim is to establish a fish farm capable of growing and marketing any amount of tilapia per year. It will enable you to grow tilapia fish in earth ponds utilizing the unique advantages in that selected area.
Why Tilapia? and why in Africa?
First and foremost, tilapia is amongst the most favourable fish worldwide. The demand for Tilapia is rapidly exceeding supply which is why the price remains high. Another important advantage is the reproduction and production ability of the tilapia species. West Africa has extremely ideal conditions for raising
The increasing demand encourages many growers to enter into tilapia production worldwide. Tilapia belongs to the Cichid family of fishes. It is one of the major groups of food fish around the world, especially in the tropical semi tropical areas. Tilapia has been called “Saint Peter’s fish” in reference to biblical passages about the fish fed to the multitudes. Tilapia due to the quantity and quality of the water and due to optimal weather conditions all year round. Tilapia will die if left in unheated ponds in the winters of most of North America. Because tilapia is a native African fish, it has a relatively strong resistance to diseases and therefor ideal for the earth pond or cages rearing system proposed in this project.
Fry Production Process In Tilalpia Fish Farming
Here is an example for a system of Broodstock and sex reversal: Three groups of broodstock (parents) 1000 females + 400 males which will produce 2.500.000 fry per year.
Breeding stock enter the production cycle of 14 days in the spawning ponds. After 14 days the fry are separated from their parents and transferred to the sex reversal ponds.
Why Sex reversal?
By producing 100% males we prevent the fish from reproduction. It is essential to control the number of fish in each pond.
Tilapia male is faster growing by 30-40% then Tilapia female.
The process of sex reversal is accomplished by providing high quality feed with a male hormone supplement (testosterone) which changes the fry to 98% male. Duration of treatment: 25-30 days.
The “Hormone supplement” – It is come with portions of 10 kg of high quality fish feed (45% protein) mix with 0.6 gram of a male hormone (testosterone). To mix the hormone with the feed, we use 4 liter of alcohol which spread the very little hormone on the feed. Eventually the alcohol is evaporated and disappear.
Nursery: The fry after sex reversal are transferred into nursery ponds in two stages until they reach 50 grams.
Stage A — size of 1 gram – 20 gram in 50 days in a density of 200.000/Hact.
Stage B — size of 20 gram – 50 gram in 25 days in a density of 100.000/Hact.
Stage C — Size of 50 gram – 250 gram in 65 days in density of 30000/Hact.
Stage D — size of 250 gram – 500 gram in 60 days in a density of 20000 – 25000/Hact.