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Method for culturing little yellow croakers by artificially desalting seawater salinity
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A technology of artificial seawater and small yellow croaker, applied in fish farming, climate change adaptation, application, etc., can solve the problems of low survival rate, high cost, low efficiency, etc., and achieve the effect of increasing survival rate, reducing desalination cost and shortening time
Active Publication Date: 2020-01-17
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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But this method artificially raises the grouper, its survival rate is low, only 70%;
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Embodiment 1
[0029] (1) Prepare aquaculture ponds and desalination buckets, for two aquaculture ponds and four 2 m 3 The desalinated water tanks are disinfected, and sand-filtered seawater is injected into one aquaculturepool to adjust the salinity of seawater between 26-32‰; fresh water after the storm is injected into another aquaculture pool to adjust the salinity to 6‰; Inject the fresh water after the storm into the desalination bucket, and adjust the salinity to 22‰, 18‰, 14‰ and 10‰;
[0030] Among them, the breeding pool is a semi-buried smooth surfacecement pool, with a depth of 1.8-2m, a water depth of 1m, and a water capacity of 20m. 3 , printed with scale marks, easy to calculate the water injection volume, there is a lighting lamp on the top of the breeding pond, the power of the lighting lamp is 12W, and the layout density is 1 / 10m 2 The surface of the desalination bucket is tempered glass, the color is light blue to dark blue, the bottom is conical, with scale marks print...
[0036] Small yellow croakers raised in seawater with a salinity of 28‰ to 32‰ are acutely transferred to water bodies with a salinity of 0, 2, 4, 6, 12, 18, 24, 29, 30, 36, 42, 46 and 63‰ , the 96-hour survival rates were 0, 0, 65, 87, 95, 98, 98, 100, 98, 95, 57, 5 and 0%, respectively, such as figure 1 .
[0037] It can be seen that the small yellow croaker is a kind of eurysalline adaptable fish, and its suitable salt range is as low as 4‰, and 65% of the individuals can survive and adapt, and the maximum can reach 42‰.
Embodiment 3
[0038] Embodiment 3: 96-hour semi-lethal experiment of small yellow croaker
[0039] Using the GlobalLogitmodel method to calculate the 96-hour semi-lethal rate of small yellow croakers, the minimum salinity of the 96-hour semi-lethal of small yellow croakers is 2.45‰, and the maximum salinity is 41.68‰, such as figure 2 .
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Abstract
The invention discloses a method for culturing little yellow croakers by artificially desalting seawatersalinity. The method particularly includes the steps: (1) disinfecting two culture water tanksand four desalting water barrels, preparing the seawatersalinity of one culture water tank to reach 2.6-3.2%, preparing the seawatersalinity of the other culture water tank to reach 0.6%, and preparing the seawater salinity of four desalting water barrels to reach 2.2%, 1.8%, 1.4% and 1.0%; (2) selecting well-fed adult little yellow croakers without wound surfaces, placing the selected little yellow croakers into the culture water tank with the seawater salinity of 2.6-3.2% to temporarily culture the little yellow croakers; (3) sequentially transferring the little yellow croakers into the desalting water barrels with the salinity of 2.2%, 1.8%, 1.4% and 1.0%, and keeping the little yellow croakers into the desalting water barrels for 4 hours to hunger the little yellow croakers; (4) transferring the little yellow croakers into the culture water tank with the salinity of 0.6% from the desalting water barrels. According to the method, desalting can be completed within one day, and theculture survival rate reaches up to 95% or more. Compared with the prior art, time is greatly shortened, desalting cost is reduced, and the survival rate is remarkably increased.
Description
technical field [0001] The invention belongs to the technical field of seawater fish, and in particular relates to a method for artificially desalinating small yellow croakers with artificial seawater salinity. Background technique [0002] Small yellow croaker, large yellow croaker, hairtail and cuttlefish are also known as my country's "Four Seafoods" and are important economic fish along the coast of my country. The small yellow croaker is a euryhaline fish, overwinters in the deep sea in winter, migrates to the coast in spring, and after spawning in March to June, disperses in the offshore for bait, and returns to the deep sea at the end of autumn. Small yellow croaker is rich in protein, sugar, fat, calcium, phosphorus, iron, potassium, sodium, magnesium and vitamin A and other nutrients needed by the human body. Delicious, deeply loved by coastal and even inland people. [0003] With the continuous development of society, people's requirements for the freshness of fo...
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