There are new ways to raise efficiency

Chengchi Lake nesting stingray Changjiang Fisheries Research Laboratory was originally a large-scale soft-shelled turtle farm. In the case of a drop in the market price of turtles and a decline in breeding efficiency, monoculture turtles could not maintain normal operation. How to further tap the potential of production and increase economic efficiency under the existing conditions of fish ponds is the most important issue that the author discusses. In recent years, the local stingray culture has become popular and the market is flourishing. Taking into account the stingray’s requirement for breeding water quality is the same as that of the soft-shelled turtle and its non-conflict feature of feeding quality and soft-shelled turtle, the experiment was conducted to establish the stingray pond to raise stingrays. Has achieved better results. The main technical measures are summarized as follows:
First, the pond conditions to choose turtles adult fish breeding pool 8, according to the serial number for the No. 1-8, a total of 8 acres, the pool size is basically the same, the average pool area of ​​1 mu, depth of 1.5 meters, sediment sediment It is long and wide, with wide north-south, abundant sunshine, good ventilation, convenient drainage and irrigation, and a quiet environment.
Second, the source of fingerlings is soft-shelled turtle, grass carp, white pelicans, and flower pods. This is a self-produced species of fish on the test field. Stingray is a wild species of large lakes in the suburbs of Jingzhou City.
Third, the stocking stocking turtles stocking density of 800 / acre, specifications 150-200 g / only, grass carp 10 / acre, specifications 250 g / tail, calyx 40 / acre, specifications 150-200 g / tail, White sturgeon, 100 tails/mu, specification 250 g/tail, 12.5 g/tail stingray, were released at four stocking densities of 4 kg, 8 kg, 10 kg, and 15 kg per acre. In order to ensure the smooth progress of the trial, the seedlings of A. japonica that died within one month after the stocking were replenished at any time. In case of human-induced or half-breeding deaths in the short-term, all experimental data in the pool were invalidated.
IV. Pond Management 1. Clear Pond Disinfection and Water Quality Regulation Fish species Each pond shall be sterilized with limed dry ponds prior to stocking, clearing wild fish and frogs, and regulating water quality. Half a month later, fish shall be kept. The transparency shall be kept within 30-40 cm during cultivation. , Change the water every month 30-50 cm, every 10-15 days with 40-50 mg / liter of quicklime or 1-1.5 mg / liter of bleach Quanchiposa.
2, feeding because the main breeding species is soft-shelled turtle, feeding only for the soft-shelled turtle feeding, strictly according to the "four definite" feeding method, and observe the growth and health of turtles and other fish at any time, increase or decrease the amount of feeding and increase Suitable medicine baits. Stingrays do not feed.
V. Prevention of fish diseases In the test pool, lime is splashed regularly according to the above method to adjust the water quality so that the pH is slightly alkaline. According to the incidence of pests and diseases of conventional fish in water bodies, it is treated with insecticides and other methods, and monthly. Sterilize once with bleach.
6. Analysis of results From May 2000 to stocking in the dry pool at the end of October, after about 150 days of feeding and management, a total of 347.5 tons of sturgeon was harvested without affecting the production of turtle, grass carp, calyx, and whitefish. Kilograms, an average of 46.8 kilograms per mu of stingray.
1. The relationship between the stingray and other fish The total area of ​​the turtle farm in the test area was 30 mu. After comparison, the production and individual size of the turtle in the 8 mu test pond had no significant difference with the non-stocked stingray and another 22 mu of pond. There was also no significant difference in the yield of grass carp, flower buds and whitefish raised.
2. The relationship between the amount of seeds to be put and the specifications and yields showed that although the amount of yellow sturgeons was different, the fish yields did not differ significantly, but the specifications showed a significant difference. That is, 4 kg of fish species were stocked per acre. The 8 kilograms are 1.8 times larger, nearly 2 times larger than 10 kilograms and 3.2 times larger than 15 kilograms. This shows that the greater the seeding density of the stingray, the smaller the size of its exit pond.

3. Comparison of Economic Benefits Despite the fact that the production of stingrays in the four experimental pools is not relevant, due to the different specifications of the outlet ponds, individuals (80 grams or more) that meet the listing requirements have higher prices and are popular with consumers. Better efficiency. 4-8 kilograms per acre, the economic benefits of 370-395 yuan; and 15 kg per acre seed is only 113-130 yuan.
VII. Suggestions 1. It is a viable method of production to raise a stingray into a pond, and the effect is significant.
2. This type of production has no effect on the production of other fishes, and does not increase investment. It effectively uses the productive potential of the pond and makes full use of feed.
3. The density of stingrays is directly related to their growth rate and profit. According to the current market sales situation, it is determined through this test that the density of 12.5g/tail codfish of Taichi Pond is 4-8kg/mu.

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