Tilapia and golden oysters have good mixed culture
According to Zhuhai Sanzao and Pingsha's general mode, 8 acres of water surface ponds alone make profits of 18,000 yuan.
Tilapia and golden oysters have good mixed culture
From November to December of each year, it is the season of tilapia and goldfish in Zhuhai. At the end of 2006, many tilapia and goldfish farmers in Zhuhai were caught in a dilemma. The low price of fish made them reluctant to fish out, and local tilapia and goldfish were difficult to overwinter and gradually cooled. They were unable to keep ponds in reserve and many farmers were forced to sell their hard-earned fish at a loss.
However, in the Sanzao and Pingsha areas of Zhuhai, some farmers have adopted a polyculture of tilapia and golden mullet. In the case of low fish prices, good economic benefits have been achieved. The polyculture of tilapia and gold carp reduced the cost of farming and reduced the occurrence of fish diseases. At the same time, the two species of fish could be sold out at the same time when the fish was released, and the income of the farmers was significantly increased.
In the tilapia and golden carp stocking mode, tilapia should be used as the main supplement, and gold carp should be used as a supplement, and suitable carp and carp should be stocked. Tilapia is the preferred choice of Gif Tilapia. When the seedlings are released, tilapia fry should be placed first, golden tilapia seedlings should be released after 8-10 days, and the auxiliary fish species should be placed last. Stocking densities should be controlled to the following levels: tilapia 1800-2000 tails/mu, golden carp 500-800 tails/acre, carp 25-30 tails/acre, carp 100-150 tails/acre. After the water temperature stabilized at 18°C ​​or more in late March of that year, April-May was the best period for laying seedlings. Water tests are to be conducted one week before release.
Tilapia seedlings were first marked with coarse and thick, and during the roughing period, the fry started to feed the next day after the water was released. The feed was selected from the squid powder with a crude protein content of more than 35% and was fed 4-5 times a day. After the crude tilapia is over, the gold carp can feed the tilapia feed normally without feeding. In this process, in addition to the “four prescriptionsâ€, feeds should be checked for fish digestion and absorption at any time.
It should be noted that when the tilapia and golden carp seedlings are in the lower pond, the size of the fry is smaller, and the first work of the fry under the pond is domestication. For example, daily domestication by means of sound (grasping palms, knocking sounds, etc.) before feeding. Domestication takes 5-8 days. When fish fry under the pond, it is necessary to pay attention to the fry cultivation. Before the fish fry, the bottom water should be used for basic bait breeding, so that the fish fry pond has more natural food after the pond. Because the fish fry is small, all kinds of nutrition should be comprehensive and feed requirements. High protein content. Generally when the fry size is 0.5-30 g, the feed is powder and the protein content is 35%.
In terms of management, in addition to routine establishment of diaries, daily patrols, regular sampling and removal of debris, polyculture of tilapia and golden mullet needs good results and water quality is very important. Under normal circumstances, the main method of water quality regulation is to change the water, but also to maintain the relative stability of the water, do not big row irrigation, a small number of times in order to reduce the fish's environmental stress. At the beginning of the fry, the water depth of the pond is maintained at about 0.8-1.2 meters, and then the new water is slowly added to 1.5-2 meters deep. In the early stage of breeding, it is not necessary to change the water or change the water a little. Tilapia need to change the water regularly after it grows up to half a catty, and at least 8-10 days to change the water. In the later period of cultivation, as the amount of feed increases, the water quality changes very quickly. To maintain a certain degree of transparency, increase dissolved oxygen, and promote the growth of tilapia and goldfish, and other fish rearing.
The polyculture of tilapia and gold carp should pay attention to fertilization and water conservation in the early stage. The transparency should be kept within 15-20 cm. The water quality management in the middle and later stages should focus on controlling the ecological balance of the water body. During the cultivation process, some biological agents should be used to adjust the water quality (EM). Bacteria, photosynthetic bacteria, sediment modifier, zeolite powder, etc.). This will greatly help the water ecological balance and water quality stability. In the later period, the transparency of the water quality is preferably 25-35 cm.
Calculated according to the general pattern of Sanzao and Pingsha farmers, the water area of ​​fish ponds is 8 mu, and the rent for ponds is 600 yuan/mu; the volume of tilapia seedlings is 20,000, and the average yield per mu is 2500-3500 kg; According to the survival rate of 90%, there are 3,600, and the output is generally 200 pounds/mu. When a fish is fished, tilapia is 3 yuan/kg, gold carp 9 yuan/kg, plus other auxiliary fish species, a pond with 8 acres of water can earn nearly 80,000 yuan. Subtracting the costs of seed, feed, pond rent, electricity bills, etc., a single pond has a single-year profit of 18,000 yuan. This breeding mode only used tilapia feed, which greatly reduced the cost of breeding golden mullet. At the same time, the higher selling price of golden mullet increased the total output value of the culture. This type of local adjustment made use of the brackish area to increase the income of brackish water resources. The method is worth learning from.
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