Seabass farming brings high economic benefits, so many farmers implement it. However, in order to own the amount of seabass that meet the standards of quality and high yield. These Seabass farming techniques That’s something you can’t miss.
Selection of location and pond design
Requirements when choosing a pond location
Clean and unpolluted water source, far from residential areas, far from industrial wastewater, ensuring stable environmental factors. Near the road, near the power source, near the source of fingerlings, …
Design, construction and preparation of ponds
The pond has an area of 1,000 – 20,000 m2, preferably from 2,000 – 5,000 m2.
The water depth is from 1.2 – 1.5 m, the pond has its own inlet and outlet, the bottom is sandy or sandy and slightly sloped towards the outlet.
The pond is built near the place where there is a supply of fingerlings, not affected by pollution by industrial and agricultural wastewater, and convenient for transportation. As close as possible to an area with a large tidal range, as possible to facilitate water exchange and harvest, inefficient shrimp ponds can also be used to raise fish.
Measures to improve ponds and prepare ponds are carried out as in nursery ponds. If the pond has low pH, the dose of lime must be increased by 30-50 kg/100 m2.
Technique of picking and releasing fish
The fingerlings released into the fishponds must be uniform in size (8-10 cm) without disease, without scratches, active swimming, light gray white color.
Stocking of fingerlings: for the two forms of single culture and polyculture, different stocking forms.
After renovating the pond, taking water in, you can immediately release the fingerlings, stocking with a density of 2-3 fish/m2. For single ponds, in the beginning, feed the fish 2-3 times/day, when the fish is over 200g, feed once/day, the amount of food each feeding depends on the fish’s needs.
When feeding, spread the food slowly at a fixed point in the pond, before feeding make a noise to focus the fish on the feeding point. Daily check the pond environment, fish catching activity, 7-10 days check the growth rate to adjust the amount of food.
In the first time of farming, only run the fan in the evening, when the fish is large, depending on the total weight of the fish in the pond, adjust the running time of the fan accordingly.
The amount of water change for single ponds ranges from 30–50% depending on the level of pollution in the pond. The water level in the pond is always maintained above 1.2 m.
For single ponds, if the bottom is too polluted because waste and leftovers accumulate, it can easily lead to the risk of disease outbreak. Therefore, when the fish reaches the size of 200-300g, it is possible to transfer the fish to a new pond in combination with sorting the fish by size to adjust the density.
Seabass can be reared together with tilapia with the aim of letting tilapia eat less food, limiting environmental pollution, and the number of juveniles of tilapia is a source of food for wild fish, limiting costs. food fees.
For polyculture, after pond improvement, fertilize with organic fertilizer at a rate of 10-15 kg/100 m2). After 5-7 days when the plankton develops, proceed to release adult tilapia at a density of 1-2 fish/m2 (ratio of male/female: 1/3). After two months, when the baby tilapia appeared, the fingerlings were released.
For polyculture ponds, due to the presence of tilapia as food, the amount of feed as well as the number of feeding times are adjusted depending on the number of tilapia in the pond.
For polyculture ponds, water changes should be limited to keep the natural food for tilapia, if changed, only about 30% of the water in the pond should be changed.
Technical care and management
Food and feeding
Feed is currently a big problem that seabass farming is facing, currently trash fish is a common food source for seabass farming.
For single culture, if using trash fish, usually minced fish to feed, feed twice a day in the morning and in the evening. Dosage: The first two months feed 10% of fish body weight; then feed 5% of the body weight
For polyculture ponds, the feeding dose is 1/2 of that of monoculture ponds and adjust the amount of feed according to the amount of tilapia spawning in the pond.
Due to the scarcity of trash fish in some places, especially in the rainy and stormy season, rice bran powder can be used to reduce the amount of trash fish used with the ratio of trash fish: 70%, rice bran: 30%.
At present, some advanced countries use processed feed (multiple ingredients) for the process of raising seabass.
Environmental factors management
During the rearing process, regularly monitor the water color, identify environmental factors, monitor environmental factors and the growth rate of fish to adjust the food accordingly. Monitor health status and diseases to take timely measures.
For single ponds, regularly change water and supply additional water for ponds, the amount of water changes from 30-50%.
For polyculture ponds, due to the need to maintain water color and natural food for tilapia, water changes should be limited, about every 3-5 days. In commercial seabass ponds, the water level must ensure a depth of over 1.2 m.
The pond system, equipment and tools in the hatchery must be regularly cleaned, treated with pathogens and sterilized. Fish breeds before stocking need to treat diseases.
Fish food must be fresh and have an expiration date. Feed the fish at the right dose and ensure enough nutrients for the fish. Periodically change water to improve pond environmental conditions.
Harvest and store products after harvest
Depending on the size of the fish that is popular in the market, the time to harvest is decided. After 6-12 months of rearing, seabass reaching the size of 0.5-1.2 kg/fish can be harvested. When harvesting, pay attention to:
Do not feed fish 1-2 days before harvest.
Harvesting method: Before harvesting, drain the pond water to about 0.5 – 0.6m. Use a trawl net with a mesh size of 2a = 1-2 cm to collect fish, and finally drain the fish with a net to avoid the fish hitting the hand.
Fish after harvesting must be kept alive, or preserved fresh before consumption to ensure product quality and value.
We are happy to share with you information related to seabass farming techniques, which farmers can consider and apply to improve their fish farming models.