In recent years, as the scale of large yellow croaker farming has expanded year by year and the number of cultures has increased year by year, the price of large yellow croaker has also decreased year by year. In the past, the era of cost-free, how to raise money can no longer exist. Farmers should reduce the cost of breeding from reducing factors such as reducing mortality and improving feed utilization. Otherwise, it will be high-input, low-output, or even loss-making. Feed costs account for 60% to 70% of the cost of farming. Therefore, it is particularly important to reduce costs in terms of improving feed utilization. After understanding, I have summarized the following ways to improve feed utilization:
First, choose a favorable breeding sea area
Large yellow croaker is warm and warm nearshore fish. The suitable salinity range is between 17‰28‰, the dissolved oxygen content of water is above 5.0mg/L, and the pH value is 8.0; these requirements are not met. The appetite of the large yellow croaker is greatly reduced, and the feed is wasted. Therefore, new farmers should choose to breed large yellow croaker in a straight and stable sea area with a flow rate of about 1 m / s and a water depth of more than 5 m. The bottom of the cage is still more than 1.5 m from the bottom of the sea at the lowest tide level. Between 8 °C and 29 °C, the salinity is between 13‰32‰ and the transparency is about 1m. In addition, the large yellow croaker is very sensitive to the sound response. The vibration sound, the impact sound, and the walking sound can make it startle and stop eating. Therefore, the breeding area should be far from the channel.
Second, choose high quality and low price feed
In the sea area, there are not only many types of chilled fish bait, but also a variety of brands. The quality and grades are different. The promotion methods are varied. Some farmers are fascinated by low prices. They purchase some metamorphic small fish bait or do not consider different feeding stages. Blindly purchase different requirements for feed nutrition and particle size, and even feed large yellow croaker with livestock feed or herbivorous fish feed, such as feeding large yellow croaker with sweet potatoes, causing malnourished malnutrition, slow growth, morbidity, and death. High rate, high cost and low efficiency. Therefore, farmers must carefully purchase high-quality and high-quality feed, high-quality feed can not only fully guarantee the nutritional needs of large yellow croaker, but also improve the disease resistance of large yellow croaker. When purchasing compound feed, the manufacturer who wants to produce the feed should stress the quality of the credit, the feed nutrition index and the particle size should meet the requirements of the fish to be fed, and the feed coefficient of the feed is low and reasonable. Before purchasing a large amount of feed, buy a small amount of feed and test the feed effect within half a month. If the effect is good, continue to buy it. If it is not good, change the brand in time. The purchase of compound feed should be limited to one month. The purchase of chilled fish bait should be fresh and unrefined chilled fish. It is good to feed large yellow croaker with squid, etc. Under the reasonable price, try to buy fresh squid to feed large yellow croaker.
Third, the feeding method should be appropriate to
Whether the level of feed efficiency is appropriate or not, and whether the method is appropriate is closely related. Some farmers do not pay attention to feeding technology, and the amount of feeding and feeding times are not accurate, and often a large amount of feed is wasted. In order to improve feed efficiency, the following points must be mastered: 1. Before the bait, the water surface is swung in the cage to form a conditional reflection, so that the fish population can be fed upwards; 2. The fish are quickly fed after being clustered, and the fish are eaten. Full, scattered or sinking; 3. To eat the weak yellow croaker can also eat the food, the area of ​​the material should be as large as possible, and finally put a small amount of feed around the cage; 4. According to the weather, tides, water, The fish stocks are scheduled to be dosed at regular intervals.
Fourth, do a good job in daily management
Three-point management and seven-point management, the management of good or bad is directly related to the level of feed efficiency. Therefore, it is necessary to pay sufficient attention, especially in the peak season of large yellow croaker growth from May to October: 1. Use a variety of mesh cages to regularly screen and divide individuals to promote uniform growth; Strengthen patrols and inspections to prevent fish accidents. Timely remove sick fish, dead fish, prevent fish disease infection; 3. Replace and clean cages in time, keep cages clean, water body exchange freely; 4. Large cages are more conducive to food growth than small cages, can use large The cage should use large cages as much as possible.
Five, do a good job in disease prevention and treatment work
Fish disease is also an important factor affecting feed efficiency. Due to the high stocking density of cage culture, once the fish body is sick, the cross-infection spreads quickly, the condition is difficult to control, and it is easy to cause batch death. Prevention is more important than prevention. Prevention is especially important. Therefore, it is necessary to do a good job of disinfection and find that sick fish are treated in time.
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