Tilapia farming in tanks is being popular because of its several advantages.
You do not need a big space to do tilapia farming in tanks and it is not labor intensive.
You will have better management control resulting on good quality fish production.
Also you will not have a risk of losing fish due to flood or typhoons.
In order to venture in this business you must have proper information about tilapia farming in tanks.
The design of tank system and life support system plays a vital role in success of your business.
You should keep in mind the following tips while farming tilapia in tanks.
1. Tank Design For Your Tilapia Farming In Tanks
You can use two types of tank for tilapia farming in tanks.
One is circular and other is rectangular or square tank.
The ideal size of the tank should be 10 to 200 metric cubes.
You can go for rectangular or square shape tanks as they can share wall and save a lot of space and cost.
The bottom of the tank should be tapered by 5 degree towards the drain.
This will collect the waste and disposal becomes easy by removing drain stand pipe.
You should plaster the tank with waterproof additive to prevent seepage.
If you are farming tilapia in tanks you can use the Roof type Blower (which is most recommended) for aerating your tanks .
The Roof type Blower is a Hi-volume and Hi-pressure aerator suitable for operations in several 100 metric cube tank with a water level of 1 meter.
If you have one or two tank then you can use Vortex or Ring Blower aerator.
This is quite good for aerating tilapia fish especialy when farming them in tanks.
The proper aeration will increase the power consumption and the oxygen level in the water efficiently.
3. Water Supply and Drainage System
You should use good quality water for tilapia farming in tanks.
You can use irrigation water or a tap water to fill the tank.
However you should neutralize the level of chlorine in tap water by aerating the water overnight.
You can also add six gram of sodium thiosulphate per ton of water.
A shallow well which is 10 to 18 feet deep is suitable as it requires less power to drain out the water.
4. Tank Preparation
You can prepare your tank by scrubbing the wall of the tank and filling it with water.
You can immediately stock it with fingerlings however acclimate the fingerlings for 20 to 30 minutes before putting them into the water.
You can have high stock density to make it cost effective.
If you have a tank size of 100 metric cube then you can stock 300/m3 stock density that will have a recovery rate of 80%.
If you assume the harvest size of 250 gram then you will produce 3,000 kg of tilapia fish at harvest.
5. Feeds and Feeding
You can find two types of commercial feed; the sinking feed and the floating feed.
You can broadcast the feed directly to the fish.
Floating feed is more recommended because it allows better monitoring on the amount of feed to tilapia.
You can feed 2-5% of their body weight.
However the amount of feed completely depends on the fish appetite.
If tilapia fish is unable to complete the feed within five minutes then they are over fed and you should reduce the amount in next ration.
You should also monitor the size of the fish to adjust the amount of feed.
6. Water management
The quality of the water tank majorly depends on the composition of feed, quantity of wasted feed and metabolic rate of the fish.
All the feed are either consumed by the fish or left to decompose in the water culture.
Tilapia by-products include ammonia nitrogen, carbon dioxide and fecal solids.
You should remove the metabolic by-products and uneaten feeds to maintain the oxygen content in the tank water.
In order to maintain the good water quality, water exchange is necessary.
You can exchange 20 to 30 percent water every week during the first month of operation.
Water exchange may depend on the volume of fish.
You can also re-circulate or re-use the water through filtration system.
Harvesting is easy in tank system.
You need to drain out the water level until enough to submerge the fish or you can completely drain the water and the fish can be picked.