Detailed Explanation of Key Technical Points for Pollution-Free Sea Bass Farming
1. Farming waters
Farming waters generally require a water depth of 2 m—2.5 m. Half a month before releasing the fry, spread quicklime over the surrounding farming waters to disinfect them.
2. Stocking density and disinfection of fry and fingerlings
The stocking size is 0.5 g/fish—0.6 g/fish, and the stocking density is 100 fish/mu—120 fish/sq m. Before stocking, soak them in 0.5%—1% salt for 3—5 minutes; handle the fry and fingerlings carefully during stocking to avoid injury.
3. Feeding management
1. Feed training: After the sea bass fry are placed in the cage for 2—3 days, put in a small amount of small trash fish every day. When most of the fish are feeding at the water surface, begin feeding small trash fish 2—3 times a day.
2. Feeding is mainly based on locally caught small trash fish, fed 2—3 times a day.
3. Feeding method: Follow the “four fixed” principles of fixed quality, fixed quantity, fixed time, and fixed location.
4. Water quality management
Keep the water clear, change the water frequently, add water frequently, and keep the dissolved oxygen in the water no lower than 3 mg/L.
5. Pond patrol
Persist in patrolling and inspecting the pond in the morning, at noon, and in the evening, keep track of the sea bass feeding situation at all times, and adjust the feeding amount. Observe the activity of the sea bass, check the water color, measure the water temperature, promptly scoop out dead fish, and promptly send diseased fish for examination, ascertain the condition, and carry out prevention and treatment as early as possible. Keep a pond patrol log.
6. Prevention and control of sea bass diseases and pests
1. Drug prevention. Persist in regular disinfection of the farming waters, feed disinfection, and tool disinfection, with prevention as the priority and prevention more important than treatment. Take preventive measures early. As a preventive measure, crystal trichlorfon can be hung in bags around the cage. During treatment, it is best not to use the method of seining and splashing, because the diseased fish are relatively large in size, and seining will aggravate the skin abrasions on the diseased fish while also causing abrasions on the body surface of normal fish, thereby further worsening the condition.
2. Isolation of diseased fish. During the farming process, strengthen pond patrol inspections. If diseased fish are found, isolate and raise them promptly, and treat them with drugs.
3. Treat the disease specifically. After discovering the pathogen of sea bass, promptly ask technical personnel to inspect and guide, and prescribe the right medicine according to the condition of the sea bass.