CN112913759A - Purification, quality improvement and temporary culture equipment and production process for snakeheads - Google Patents
Purification, quality improvement and temporary culture equipment and production process for snakeheads Download PDFInfo
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/003—Aquaria; Terraria
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
- A01K61/13—Prevention or treatment of fish diseases
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
- A01K63/045—Filters for aquaria
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Abstract
The invention discloses purification, quality improvement and temporary culture equipment and a production process of snakeheads. The equipment comprises a fish culture tank, a micro-filter, a biological purification tank, an ultraviolet sterilizer and an oxygen supplementing and salt adjusting tank. The invention adopts the mode that the adding amount is gradually increased, so that the circulating aquaculture system has enough time for the growth of microorganisms to purify and treat the fish excrement and the residual bait in the water body, thereby preventing the water treatment system from running in an overload mode and increasing the ammonia nitrogen; by adopting a feed feeding and temporary culture strategy of stopping feeding, feeding in a small amount and feeding in a stopping manner, the amount of exercise of the snakeheads can be increased so as to match with the new environment due to relocation of fish bodies, promote fat consumption and compact meat quality and improve the mouthfeel of the snakeheads. The culture water is subjected to continuous microbial purification and ultraviolet disinfection strategies, so that the removal of the earthy taste in the snakehead meat is facilitated; by controlling the salinity of the culture water to be 2-3 thousandths, the sterilization effect on fish bodies and water bodies can be achieved, the flesh of the snakeheads is firmer, and the taste of the snakeheads is improved.
Description
Technical Field
The invention relates to the technical field of aquaculture, in particular to a purification, quality improvement and temporary culture process and equipment for snakeheads.
Background
Snakehead fish is commonly called snakehead fish, is a traditional bulk freshwater fish product in China, the meat of the snakehead fish is superior to boiled fish and sauerkraut fish, and dishes made by the snakehead fish not only have delicious taste and good nutrition, but also have the nourishing effect, and are deeply loved by vast consumers. According to data of 'Chinese fishery statistics yearbook', 26 provinces or directly administered cities in China develop artificial snakehead cultivation in 2018, the total cultivation yield reaches 459277t, but as part of snakehead cultivation enterprises reduce production cost and pursue economic benefits, high-density cultivation is developed, unclean animal viscera are purchased from slaughterhouses to serve as feeds for feeding, cultivation water quality is deteriorated, harmful plankton such as blue-green algae and the like are flourished, snakehead diseases are frequent, non-scientific means such as drug application and disease treatment and large drainage are adopted, the water area environment around a cultivation field is influenced, fishy smell of snakehead soil is increased, fat content is too high, body state is coarse and short, meat quality is loose, drug residue and wind risk are increased, body color and taste are poor, the commodity value of snakehead is reduced, and hidden danger and risk of snakehead eating safety are brought. The purification and quality improvement treatment technology of snakehead products before market consumption is necessary and urgent.
Disclosure of Invention
The invention aims to solve the technical problem of providing temporary culture equipment for purifying and upgrading snakeheads and a production process for rapidly improving the commodity value of the snakeheads at low cost before the snakeheads are on the market.
The snakehead purification, quality improvement and temporary culture equipment comprises a fish culture tank, a micro-filter, a biological purification tank, an ultraviolet sterilizer and an oxygen supplementing and salt adjusting tank; the circulating water outlet of the fish culture tank is connected with the water inlet of the micro-filter, the water outlet of the micro-filter is connected with the water inlet of the biological purification tank, the water outlet of the biological purification tank is connected with the water inlet of the ultraviolet sterilizer, the water outlet of the ultraviolet sterilizer is connected with the water inlet of the oxygen supplementing salt adjusting pool, the water outlet of the oxygen supplementing salt adjusting pool is connected with the circulating water inlet of the fish culture tank, and the circulating water outlet is connected into a closed circulating system.
Preferably, the fish culture tank is also provided with a sewage outlet; the biological purification tank is also provided with a water replenishing port;
preferably, the ultraviolet ray wavelength of the ultraviolet ray sterilizer is 254nm, so that the ultraviolet ray sterilizer is used for sterilizing the culture water, killing harmful microorganisms in the water body, particularly microorganisms such as microalgae and bacteria with earthy smell, and keeping the water quality fresh and tasteless;
preferably, a water pump is arranged between the micro-filter and the biological purification tank and used for pushing the culture water in the system to circulate continuously.
Preferably, a microfiltration machine of 120-150-mesh bolting silk is selected in the system and used for removing the particulate matters in the culture water;
the surface of the porous biological filler in the biological purification tank forms a microbial film, so that the culture water body is further purified. The microbial film is mainly microorganisms (mainly nitrate nitrogen and nitrite nitrogen bacteria) attached to the surface of the porous biological filler, can adsorb inorganic substances such as ammonia nitrogen, nitrite and the like, and along with the continuous growth and reproduction of the microorganisms, the ammonia nitrogen and the nitrite in the water body are also continuously absorbed and decomposed into nitrate harmless to aquatic animals.
Preferably, an aeration device is also arranged to supply oxygen to the fish culture tank, the biological purification tank and the oxygen supplementing salt adjusting pond, so that the dissolved oxygen of the culture water is controlled to be more than 5 mg/L.
Preferably, the aeration device adopts a Roots blower.
Preferably, the salinity of the culture water is controlled to be 2-3 thousandth by the oxygen supplementing and salt adjusting pond.
Preferably, the culture water in the fish culture tank circularly flows back to the fish culture tank from the micro-filter, the biological purification tank, the oxygen supplementing and salt adjusting tank and the ultraviolet sterilizer in sequence as a cycle period, and the cycle period is 8 to 16 cycles every day.
The invention also aims to provide a purification, quality improvement and temporary culture process of the snakeheads based on the equipment, which comprises the following steps:
and (1) placing the snakeheads to be listed in a fish culture tank.
A) Stocking density
The stocking density of snakeheads is 20kg/m according to the stocking on day 13(since the biofilm in the system needs a certain time to be established, enough fish can not be put in one time, and the biofilm is increased after being partially constructed), the biofilm is increased to 40-50kg/m in the 2 nd day3；
B) Feeding strategy
Feeding is not carried out for the first two days, the mixed feed is fed on the 3 rd day, the feeding amount is 30-50% of that of normal culture (before temporary culture), and the feeding amount is gradually reduced from the 6 th day until the feeding amount is reduced to zero on the 10 th day;
C) water quality control technology
The micro-filter, the ultraviolet sterilizer and the water pump are arranged normally;
regulating the salinity of the culture water to 2-3 thousandths;
the artificial water flow is mainly generated by fixing the water outlet of the fish culture tank in one direction to enable the water outlet to impact the water body in the fish culture tank, so that the water body forms a flow velocity which continuously rotates in one direction for a long time, and further the continuous swimming of the snakeheads is promoted, and the muscles of the snakeheads are developed;
D) intensity of illumination
Adopting natural light in the first 5 days, reducing the illumination intensity to be below 500lx in the 6 th day, and starting to adjust the body color of the snakeheads until the temporary culture is finished. Thus, the body color of the temporarily cultured snakeheads is blacker, and the stripes are clearer;
E) monitoring of water quality and fish body indicators
Measuring indexes such as water temperature, pH, ammonia nitrogen, dissolved oxygen and the like in the system culture water every day; during stocking and before catching, the body shape indexes of the snakeheads, such as the full length, the body height, the breast diameter and the like, and the contents of volatile phenol and fat in muscles and visceral masses are respectively measured;
and (2) marketing 4-5 days after stopping feeding, and controlling the whole temporary rearing time to be about 2 weeks.
The invention has the beneficial effects that:
1) the invention adopts the gradual increase of the throwing quantity: firstly, the occurrence of sudden conditions of large stress response, death and the like of the fish body caused by excessive one-time input can be reduced; and secondly, the sample size is gradually increased, so that the circulating water culture system has enough time for microorganisms to grow, and fish excrement and residual bait in the water body are purified and treated, so that the water treatment system is prevented from running in an overload mode, and ammonia nitrogen is prevented from rising.
2) The invention adopts a feed feeding strategy of stopping feeding, feeding a little and stopping feeding, can improve the motion amount of snakeheads, so as to match the food reduction caused by the relocation of fish bodies, adapt to new environment, promote the fat consumption and the meat quality to be more compact and improve the mouthfeel of snakeheads.
3) The culture water is subjected to continuous microbial purification and ultraviolet disinfection strategies, so that the removal of the earthy taste in the snakehead meat is facilitated; the earthy smell of fish mainly comes from various algae, actinomycetes and the like in water. Actinomycetes, algae and the like brought by water and fish bodies can be removed through ultraviolet and biological membrane purification treatment, and the purpose of removing the fishy smell of the snakehead is achieved.
4) By controlling the salinity of the culture water to be 2-3 thousandths, the method not only can sterilize the fish body and the water body, but also is beneficial to making the meat quality of the snakehead more compact and improving the mouthfeel of the snakehead.
5) As consumers think that the snakeheads with darker body colors are closer to the wild and the snakeheads with darker colors are favored by the market, the invention makes the snakeheads with darker body colors by reducing the illumination intensity, meets the favor of the market and improves the market selling of the snakeheads.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention.
Detailed Description
The present invention is further analyzed with reference to the following specific examples.
As shown in figure 1, the purification, quality improvement and temporary rearing device for snakeheads comprises a fish rearing tank, a micro-filter, a water pump, a biological purification tank, an ultraviolet sterilizer and an oxygen supplementing and salt adjusting tank; the circulating water outlet of the fish culture tank is connected with the water inlet of the micro-filter, the water outlet of the micro-filter is connected with the water inlet of the circulating water pump, the water outlet of the circulating water pump is connected with the water inlet of the biological purification tank, the water outlet of the biological purification tank is connected with the water inlet of the ultraviolet sterilizer, the water outlet of the ultraviolet sterilizer is connected with the water inlet of the oxygen supplementing salt adjusting pool, the water outlet of the oxygen supplementing salt adjusting pool is connected with the circulating water inlet of the fish culture tank, and the circulating water outlet is connected into a.
Preferably, the fish culture tank is also provided with a sewage outlet; the biological purification tank is also provided with a water replenishing port;
preferably, the ultraviolet ray wavelength of the ultraviolet ray sterilizer is 254nm, so that the water for cultivation is sterilized, micro-algae, bacteria and other microorganisms with earthy smell in water are killed, and the water quality is kept fresh and tasteless;
preferably, a water pump is arranged between the micro-filter and the biological purification tank and used for pushing the culture water in the system to circulate continuously.
Preferably, the microfiltration machine is a 120-150-mesh bolting silk microfiltration machine used for removing the particulate matters in the culture water;
the surface of the porous biological filler in the biological purification tank forms a microbial film, so that the culture water body is further purified. The microbial film is mainly microorganisms (mainly nitrate nitrogen and nitrite nitrogen bacteria) attached to the surface of the porous filler, can adsorb inorganic substances such as ammonia nitrogen, nitrite and the like, and along with the continuous growth and reproduction of the microorganisms, the ammonia nitrogen and the nitrite in the water body are also continuously absorbed and reduced and are decomposed into nitrate harmless to aquatic animals.
Preferably, the fish culture tank, the biological purification tank and the oxygen supplementing and salt adjusting pond are also provided with aeration devices, so that the dissolved oxygen of the culture water is controlled to be more than 5 mg/L.
Preferably, the aeration device adopts a Roots blower.
Preferably, the salinity of the culture water is controlled to be 2-3 thousandth by the oxygen supplementing and salt adjusting pond.
Preferably, the culture water in the fish culture tank circularly flows back to the fish culture tank from the micro-filter, the biological purification tank, the oxygen supplementing and salt adjusting tank and the ultraviolet sterilizer in sequence as a cycle period, and the cycle period is 8 to 16 cycles every day.
Example 1: the purification, quality improvement and temporary culture process of the snakeheads based on the equipment comprises the following specific steps:
and (1) placing the snakeheads to be listed in a fish culture tank.
C) Stocking density
The stocking density of snakeheads is 20kg/m according to the stocking on day 13(since the biofilm in the system needs a certain time to be established, enough fish can not be put in one time, and the biofilm is increased after being partially constructed), the biofilm is increased to 40-50kg/m in the 2 nd day3；
D) Feeding strategy
Feeding is not carried out for the first two days, the mixed feed is fed on the 3 rd day, the feed feeding amount is 30-50% of that of normal culture (before temporary culture), and the feed feeding amount is gradually reduced from the 6 th day until the feed feeding amount is reduced to zero on the 10 th day;
C) water quality control technology
The micro-filter, the ultraviolet sterilizer and the water pump are arranged normally;
regulating the salinity of the culture water to 2-3 thousandths;
the artificial water flow is mainly generated by fixing the water outlet of the fish culture tank in one direction to make the water flow impact the water body in the fish culture tank, so that the water body forms a flow velocity which continuously rotates in one direction for a long time, and further the continuous swimming of the snakeheads is promoted, and the muscles of the snakeheads are developed;
D) intensity of illumination
Adopting natural light in the first 5 days, reducing the illumination intensity to be below 500lx in the 6 th day, and starting to adjust the body color of the snakeheads until the temporary culture is finished. Thus, the body color of the temporarily cultured snakeheads is blacker, and the stripes are clearer;
F) monitoring of water quality and fish body indicators
Measuring indexes such as water temperature, pH, ammonia nitrogen, dissolved oxygen and the like in the system culture water every day; during stocking and before catching, the body shape indexes of the snakeheads, such as the full length, the body height, the breast diameter and the like, and the contents of volatile phenol and fat in muscles and visceral masses are respectively measured;
and (2) marketing 4-5 days after stopping feeding, and controlling the whole temporary rearing time to be about 2 weeks.
Results of the experiment
Influence of ecological net culture on nutrient indexes of snakehead muscle
TABLE 1 comparison of the Murasbora obscura muscle nutrient index whether the ecological net culture is achieved (n ═ 5)
Note: the data in the same row are marked with a significant difference (p <0.05), the data in the same row are marked with a significant difference (p <0.01), and the data in the same row are not marked with a significant difference (p >0.05)
Table 1 shows that the fertilizer fullness of the snakeheads after ecological net culture is obviously higher than that of the snakeheads which are not completely cultured, and the shell rate and the liver-body ratio of the snakeheads after ecological net culture are both lower than those of the snakeheads which are not completely cultured. Therefore, the snakehead body is more body-building after the ecological net culture is adopted.
Second, the influence of ecological net culture on the amino acid composition of snakehead muscle
TABLE 2 differentiation of amino acid composition of snakehead muscle whether or not the ecological net culture is performed
Table 2 shows that the water content of the snakeheads after ecological net culture is higher than that of the snakeheads which are not subjected to ecological net culture, and the difference is very obvious; the content of crude protein is higher than that of the snakeheads which are not ecologically and cleanly raised, and the difference is obvious; the content of crude fat is lower than that of the snakeheads which are not ecologically and cleanly cultured, which shows that the fat content of the snakeheads is reduced after the ecological and neat culture, the water content is sufficient, and the protein is high. From the analysis of amino acid composition, the total amount of the amino acids of the two types of the black snakeheads is 17, the content of the essential amino acid and the umami amino acid in the muscles of the black snakeheads after the ecological net culture is totally higher than that of the black snakeheads which are not ecological net culture, and the black snakeheads are more delicious.
Influence of ecological net culture on nutritive value of snakehead muscle
TABLE 3 difference in nutritive value of snakehead whether the ecological culture is clean or not (mg/g N)
As can be seen from Table 3, the first and second limiting amino acids were obtained as valine and sulfur-containing amino acids, respectively, based on the northern snakehead muscle AAS score (amino acid score) for the ecological net-cultured group and the non-ecological net-cultured group. The first and second limiting amino acids of CS (chemical score) in the muscles of the ecological net-cultured group and the non-ecological net-cultured group of snakeheads are sulfur-containing amino acid and valine respectively. The EAAI value (essential amino acid index) of the ecological net-cultured group and the non-ecological net-cultured snakehead are respectively 89.23 percent and 87.69 percent. The amino acid score and the essential amino acid index of amino acid in the muscles of the snakeheads are higher in the total body of the ecological net-cultured group than that of the non-ecological net-cultured group, which indicates that the muscle protein of the ecological net-cultured group has higher nutritional value.
Fourth, the influence of whether ecological net culture is carried out or not on the meat structure of snakehead muscles
TABLE 4 texture test results of snakehead muscle by testing whether ecological net culture is performed or not by puncture test
The puncture test result (table 4) shows that the hardness, elasticity and rupture strength of the ecological net-cultured snakeheads are higher than those of the ecological net-cultured snakeheads, and the difference is very obvious (p is less than 0.01); the toughness of the ecological net culture group is slightly higher than that of the ecological net culture group.
Fifthly, influence of ecological net culture on flavor substances in snakehead muscle
TABLE 5 differences in flavor substances in the muscle of snakehead fish whether or not the group is ecologically and purely raised
59 volatile odor substances including 19 aldehydes, 17 alcohols, 8 ketones, 8 olefin alkanes and 7 other substances are detected from the muscle of the ecological net-cultured snakehead fish; 57 volatile odor substances, 27 aldehydes, 11 alcohols, 6 ketones, 8 olefin alkanes and 6 other substances are detected in the muscles of the snakehead without ecological net culture.
Fish fishy smell is heavier than shrimp, and fish with a high fat content may have more fishy smell, and visceral fishy smell may be heavier than muscle smell. The amount of the hexanal detected in the snakeheads after ecological net culture is lower than that of the snakeheads without ecological net culture, which indicates that the fishy smell of the snakeheads can be reduced by the ecological net culture. According to the content of the 1-octene-3-alcohol related to the earthy taste, the earthy taste and the fish smell of the ecological net-cultured snakeheads are both low, and the taste of the ecological net-cultured snakeheads is better.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.
Claims (10)
1. A purification, quality improvement and temporary culture device for snakeheads is characterized by comprising a fish culture tank, a micro-filter, a biological purification tank, an ultraviolet sterilizer and an oxygen supplementing and salt adjusting tank; the circulating water outlet of the fish culture tank is connected with the water inlet of the micro-filter, the water outlet of the micro-filter is connected with the water inlet of the biological purification tank, the water outlet of the biological purification tank is connected with the water inlet of the ultraviolet sterilizer, the water outlet of the ultraviolet sterilizer is connected with the water inlet of the oxygen supplementing salt adjusting pool, and the water outlet of the oxygen supplementing salt adjusting pool is connected with the circulating water inlet of the fish culture tank.
2. The purification, quality improvement and temporary culture equipment for the snakeheads as claimed in claim 1, wherein the fish culture tank is also provided with a sewage discharge outlet; the biological purification tank is also provided with a water replenishing port.
3. The purification, quality-improvement and temporary culture equipment for snakeheads as claimed in claim 1, wherein the ultraviolet wavelength of the ultraviolet sterilizer is 254 nm.
4. The device for purifying, upgrading and temporarily keeping snakeheads as claimed in claim 1, wherein a water pump is arranged between the micro-filter and the biological purifying tank for pushing the culture water in the system to circulate continuously.
5. The purification, quality-improvement and temporary culture equipment for snakeheads as claimed in claim 1, wherein the micro-filter is 120-150 mesh bolting silk.
6. The purification, quality-improvement and temporary culture equipment for snakeheads as claimed in claim 1, wherein biological fillers are arranged in the biological purification tank, and a microbial film can be formed on the surface of the biological purification tank, so that the culture water body is further purified; the biological purification tank is internally provided with a porous filler, and microorganisms are attached to the surface of the porous filler.
7. The device for purifying, upgrading and temporarily raising snakeheads as claimed in claim 1, wherein an aeration device is further provided to supply oxygen to the fish culture tank, the biological purification tank and the oxygen supplementing and salt adjusting pond, so that the dissolved oxygen of the culture water is controlled to be above 5 mg/L.
8. The purification, quality improvement and temporary culture equipment for snakeheads as claimed in claim 1, wherein the salinity of culture water is controlled to be 2-3 thousandths by an oxygen supplementing and salt adjusting pond.
9. The device for purifying, upgrading and temporarily keeping the snakeheads as claimed in claim 1, wherein the culture water in the fish keeping tank circularly flows back to the fish keeping tank from the micro-filter, the biological purification tank, the oxygen supplementing and salt adjusting tank and the ultraviolet sterilizer in sequence as a cycle period, and the cycle period is performed 8-16 times per day.
10. The snakehead purification, quality improvement and temporary culture process based on the equipment of any one of claims 1 to 9, which comprises the following specific steps:
step (1), putting snakeheads to be listed in a fish culture tank;
A) stocking density
The stocking density of snakeheads is 20kg/m according to the stocking on day 13Increased to 40-50kg/m on day 23；
B) Feeding strategy
Feeding is not carried out for the first two days, the mixed feed is fed on the 3 rd day, the feed feeding weight is 30-50% of that before temporary rearing, the feeding amount is gradually reduced from the 6 th day until the 10 th day is reduced to zero;
C) water quality control technology
The micro-filter, the ultraviolet sterilizer and the water pump are arranged normally;
regulating the salinity of the culture water to 2-3 thousandths;
the artificial water flow stimulation is manufactured by mainly utilizing the water outlet of the water inlet pipeline of the circulating system to fix water which flows out in one direction and impacts the water in the fish culture tank to form a flow velocity which continuously rotates in one direction for a long time, so that the continuous swimming of the snakeheads is promoted, and the muscles of the snakeheads are developed;
D) intensity of illumination
Adopting natural light in the first 5 days, reducing the illumination intensity to be below 500Lx in the 6 th day, and adjusting the body color of the snakeheads until the temporary culture is finished;
E) monitoring of water quality and fish body indicators
And (2) marketing 4-5 days after stopping feeding.
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| CN202110075004.6A CN112913759A (en) | 2021-01-20 | 2021-01-20 | Purification, quality improvement and temporary culture equipment and production process for snakeheads |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110075004.6A CN112913759A (en) | 2021-01-20 | 2021-01-20 | Purification, quality improvement and temporary culture equipment and production process for snakeheads |
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Application publication date: 20210608 |