In recent years, as the scale of large yellow croaker farming has increased year by year and the number of farmed animals has increased year by year, the price of large yellow croaker has also declined year by year. In the past, the era of cost-free and how to raise money has disappeared. Farmers should reduce aquaculture costs from many factors such as reducing mortality and improving feed utilization. Otherwise, they will be high-input, low-output, and even loss-making. Feed costs account for 60% to 70% of aquaculture costs. Therefore, it is particularly important to reduce costs in terms of improving feed utilization. After understanding, the author summarizes the following points to improve feed utilization methods:
First, choose a favorable breeding area
Large yellow croaker is a warm-skinned inshore fish with a suitable salinity range of 17 ‰ to 28 ,. The dissolved oxygen requirement for water is more than 5.0 mg/l, and the pH value is 8.0; this does not meet these requirements. The appetite of large yellow croakers is greatly reduced, and the feed to be eaten will be wasted. Therefore, new farmers should choose to breed large yellow croakers in the sea where they can flow straight and stable. The flow rate should be about 1m/s, the water depth should be more than 5m, and the bottom of the cage should be more than 1.5m above the sea floor at the lowest tide level. Between 8°C and 29°C, the salinity is between 13 ‰ and 32 ,, and the transparency is about 1 metre. In addition, the large yellow croaker is very sensitive to the sound response. The vibrating sound, the percussive sound, and the moving sound all make it frightened and stop feeding. Therefore, the culture area should be far away from the fairway.
Second, choose high quality and low price feed
In the sea area, there are not only many varieties of chilled fish, but also a large number of brand-name feeds. The quality and grades are different. There are a variety of promotion methods. Some farmers are guilty of being low-priced and buy some metamorphic fish foods or do not consider different feeding stages. The blind purchase of feed nutrients and particle size requirements, and even the use of livestock feed or herbivorous fish to feed large yellow croakers, such as feeding large yellow croaker with sweet potatoes, causing large yellow croaker malnutrition, slow growth, morbidity, mortality High rate, high cost and low efficiency. Therefore, farmers must carefully purchase high-quality, flat-rate feed. High-quality feed can not only fully guarantee the nutritional needs of large yellow croaker, but also increase the disease resistance of large yellow croaker. When purchasing compound feed, it is required that the manufacturer who produces the product feed should emphasize quality, and the feed nutrient index and particle size must meet the requirements of the fish to be fed. The feed bait coefficient is low and reasonable. Before purchasing a certain amount of feed in bulk, you should purchase a small amount of feed first, and test the effect of the feed in half a month. If the effect is good, you can continue to purchase, and if it is not timely, you can replace the brand. The purchase of compound feed should be limited to within one month. The choice of chilled fish bait should be chilled fresh fish that is not deteriorating, and the effect of feeding large yellow croaker with bonito is good. At reasonable prices, try to buy fresh fish and feed the croaker.
Third, the feeding method should be properly
There is a close relationship between the level of feed efficiency and the amount of feed, and whether the method is appropriate. Some farmers do not attach importance to feeding techniques, and the amount of feeding and the number of feedings are inaccurate, often resulting in a large amount of feed waste. In order to increase feed efficiency, the following points must be mastered: 1. Before hand-feeding, the water in the cage should be stroked by hand to form a conditional reflex so that the fish can feed on the ground; 2. After the fish is clustered, it is quickly fed to the fish. Saturate, spread or sink; 3. In order to take care of fragile large yellow croaker can also eat food, sprinkle the material area as much as possible, and finally make a small amount of feed around the cage; 4. According to the weather, tide, color, The timing of fish school activities was quantitatively fed.
Fourth, do a good job of daily management
Three points of raising seven points, management is directly related to the level of feed efficiency. Therefore, we must pay enough attention, especially in the peak season of large yellow croakers from May to October to strengthen management: 1. Use a variety of specifications of the net cages, regular screening of individuals of uneven size, promote uniform growth; 2 Enhance patrols and inspections to prevent fish escape accidents. Fish diseased fish and dead fish in time to prevent the spread of fish diseases; 3. Replace and clean cages in time to keep cages clean and free of water exchange; 4. Large cages are more conducive to feeding and growth than small cages. Net cages should be as large as possible.
Fifth, do a good job of preventing and curing diseases
Fish disease is also an important factor affecting feed efficiency. Due to the high stocking density of cage culture, once the fish body becomes ill, cross-infection spreads quickly and the disease condition is difficult to control, which can easily cause batch death. Prevention is more important than prevention. Prevention is particularly important. Therefore, we must do a good job of disinfection at ordinary times and find the diseased fish timely treatment.
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