Freshwater perch culture techniques Water temperature conditions of sea bass culture

Freshwater bass, as its name implies, is a kind of bass that lives in fresh water. It has a certain edible value and is very popular in the market in recent years, so it attracts a lot of people to raise it. However, in the process of breeding, in addition to mastering the skills of breeding, the control of water temperature is also a very important step. Let's take a look at it together.

Culture techniques of freshwater perch

1. Pond construction. The pond covers an area of 5 to 8 mu, which is rectangular and runs better from north to south. It is required that the bottom of the pool is flat, the sediment is sandy, the bank of the pool is firm, and the depth of the pool is 2 meters. The bottom of the pool is equipped with an inlet and drainage pipe and an aerator. Desilt and disinfect the pond before stocking. Fertilize and cultivate the basic bait to make the pool water oil green or tea brown.

2. Seedling cultivation. The sea bass seedlings caught from the sea area (1.5 cm in length) were desalinated to a salinity of 4 ‰ ~ 7 ‰ and put into a temporary culture pond (salinity 1 ‰). The stocking density of the temporary culture pond is controlled at 10 ~ 20 thousand per mu, and the flushing water of the pond is often flushed to increase oxygen. The next day, the pond began to feed fresh baits such as zooplankton and red worms, and then gradually mixed fish paste, floating particles and fresh feed, domesticated to the point where surimi and floating pellets could be fed. The daily feeding amount is 15% of the body weight of the fish in the pond, which is fed in three times. Three days before the start of feeding, every 50 kilograms of fish with 3 grams of earthy toxin and vitamin C1 grams, mixed with feed once a day, 3 times in a row. After more than 20 days, the fry were raised in a large pond when the fry grew to 4cm.

3. Feeding and management. The perch was sifted and raised in ponds according to its size. The stocking density was 2500 to 3500 per mu, the water depth was more than 1.5 meters, the water fertility was suitable, and the fitness was 30 cm, showing oil green. Twice a day, the main feed is surimi and floating pellet feed, with vitamin B and C added to the feed, and the daily feeding amount is 60% of the body weight of the fish in the pond. Feed with oxytetracycline, vitamins and other mixed bait twice a month for 3 days. Patrol the pond every day, turn on the machine to increase oxygen at night or when the weather is muggy and the air pressure is low, change the water in time and keep the water fresh.

Water temperature conditions of sea bass culture

Sea bass can feed and grow normally when the water temperature is above 14 degrees. Bass is benthic fish, like to live in clean, high dissolved oxygen content (4mg / L, transparency in 30cm / 40cm). New water should be injected flexibly and timely according to water color and transparency. In the early stage, due to the small temperature and low temperature of the fish, the water quality is easy to control, and the cycle of adding and changing water can be longer. With the growth of fish and the increase of fish pond biomass, the pond should be patrolled frequently, new water should be injected frequently, and aerator should be used reasonably to increase oxygen.

What does the bass eat?

The main results are as follows: 1. The prey of sea bass varies according to the growth period. Young fish absorb yolk for about 2 weeks, then absorb plankton, grow to 2cm and then prey on insects or shrimps in water; when they grow to 8cm, they become carnivorous fish that prey on small fish. By the time 20cm grows, it preys on everything it can control. Such as earthworms, shrimp, frogs, birds and so on. The perch's curiosity and desire are so strong that it can prey on 10% of its body volume and 70% of its prey.

2. Generally speaking, the main prey is 30% of its own body volume, 40% of its own body volume, while the prey of fish preys on slender small fish. The more mature the bass are, the more they like to hunt with a small range of movements. most of the bass want to get a lot of nutrition at one time, so they like to prey on larger or easier prey. On the other hand, bass have the instinct to adjust the number of populations, which is a characteristic of animals at the top of the food chain. If there are too many individuals in the habitat area, they may also prey on their own young fish. Studies have shown that 45% of the young bass are eaten by other bass before they reach 3cm.

Common diseases of sea bass and their control

1. Enteritis. Furazolidone bait was prepared with 0.1% addition and fed continuously for 5 days.

2. Fish lice disease. The whole pool of trichlorfon was sprinkled with crystal trichlorfon to make the water content up to 0.25 × 10 ~ (- 6) × 10 ~ (- 6) and 0.3 × 10 ~ (- 6). Once every 3 days, it can be cured twice.

3. Blackbody disease. There is no effective control method, so seedling quarantine should be strengthened, and diseased fish should be isolated and destroyed in time.

4. Water mildew. Replace new water and keep good water quality, dissolve malachite green with 6 × 10-6 malachite green for 5 minutes.

The water temperature of freshwater bass should not be lower than 14 degrees, so it should be controlled well. When breeding, it is necessary to disinfect the breeding ground, and then know what it likes to eat and feed it reasonably. Freshwater bass can also be affected by diseases, so it is also important to prevent diseases.