Circulating peak shifting marketing method for pearl grouper cultured by factory-like circulating saline-alkaline water

Abstract

The invention provides a circulating peak shifting marketing method for pearl grouper cultured by factory circulating saline-alkali water, and belongs to the technical field of aquatic product culture. According to the circulating peak shifting marketing method for the pearl-gentian groupers, a saline-alkaline water blending process and a culture management scheme suitable for the pearl-gentian groupers are systematically provided for the first time, and saline-alkaline water resources restricting agricultural production are successfully converted into high-value aquaculture resources; the geographical limitation of pearl grouper culture is broken through. According to the method, a brand new production rhythm suitable for a controllable environment is constructed, the turnover rate and the utilization rate of fixed assets are greatly improved, the facility cost of unit output is reduced, the facility utilization rate is improved, and additional high profits are created through quality improvement.

Description

Technical Field

[0001] This invention belongs to the field of aquaculture technology, specifically relating to a method for the cyclical and staggered marketing of pearl grouper in saline-alkali water recirculating aquaculture. Background Technology

[0002] The pearl grouper, also known as the tiger grouper or pearl grouper, is a hybrid grouper bred from male giant grouper and female tiger grouper. It has tender flesh, grows rapidly, and is highly disease-resistant, exhibiting a tiger-striped head and a giant grouper tail. As a high-value marine fish, the pearl grouper is an important high-value marine aquaculture species in my country. However, its market price is significantly affected by seasonal supply. Currently, its aquaculture mainly relies on near-shore cages or coastal factory farming models, which present the following problems: First, the aquaculture areas are mainly concentrated in coastal areas, resulting in high transportation costs to inland areas; second, the aquaculture cycle is fixed due to seasonal changes in natural water temperature. For example, commercial fish from Zhejiang are usually available in October and must be sold before the temperature drops, leading to a concentrated market supply and low prices; third, there is a supply gap from May to July each year, resulting in high prices, but traditional methods cannot provide a stable supply. In addition, my country's major fishing grounds, such as the East China Sea, implement a unified summer fishing moratorium system. For example, the moratorium period in the East China Sea is from 12:00 on May 1st to 12:00 on September 16th each year. During this period, the market is prohibited from selling various types of fresh or live seafood caught in the ocean, leading to a disruption in the supply of wild-caught fresh fish and creating a significant price window for farmed aquatic products.

[0003] To expand aquaculture areas and avoid peak market periods, the industry has made some attempts: (1) Using traditional seawater for factory-style recirculating aquaculture: Although environmental control can be achieved, the initial investment is large and it is only applicable to coastal areas, and cannot utilize the vast inland saline-alkali water resources. (2) Adjusting the stocking time: Limited by fixed aquaculture facilities and cycles, ordinary factory-style recirculating aquaculture can control the environment, but if only single-batch aquaculture is carried out, the facility utilization rate is low, the cost is high, and the market time planning is rough, which cannot achieve flexible and continuous production in multiple batches. In addition, the facility idle period is long and the utilization rate is low. Therefore, there is an urgent need in this field for a comprehensive solution that can effectively utilize inland saline-alkali water resources, accurately control the market time, and greatly improve the facility utilization rate and economic benefits through systematic production management. Summary of the Invention

[0004] This invention provides a method for the industrialized recirculating aquaculture of pearl grouper in saline-alkali water, enabling staggered market supply and realizing the aquaculture utilization of inland saline-alkali water resources, expanding the aquaculture area of ​​pearl grouper, and ensuring a continuous and stable supply of marketable fish during the high-price window periods from May to September each year and holidays.

[0005] This invention provides a method for staggered market launch of pearl giant grouper, in which pearl giant grouper is raised in a factory-style recirculating aquaculture system equipped with a water quality control unit, and the aquaculture water is a prepared saline-alkaline water. From September to January of the following year, a batch of pearl grouper fry is released every 1 to 2 months. Each batch of fry is separated into different ponds when it reaches 80g / fish, 150g / fish and 250g / fish. The fish are then marketed when they reach a size of no less than 450g / fish. When dividing the ponds, all the empty ponds from the previous batch are used for the ponds of the next batch, and the first batch is required to be launched in May of the following year, and the last batch in September of the following year.

[0006] In one specific embodiment of the present invention, the salinity of the aquaculture water is 5-30‰, K + Concentration not less than 200 mg / L, Mg 2+ Concentration not less than 300 mg / L, Ca 2+ The concentration should not be less than 200 mg / L, and the pH value should be 7.8~8.5.

[0007] In one specific embodiment of the present invention, the release includes releasing a batch of pearl grouper fry every 1.5 to 2 months from September of each year to January of the following year, forming at least three consecutive breeding batches including the first batch, the second batch, and the third batch.

[0008] In one specific embodiment of the present invention, the number of fish fry released in each batch is the same, or increases as the number of batches increases.

[0009] In one specific embodiment of the present invention, the stocking density of fish fry in each batch is no less than 300 fish / m³. 3 The average size of the fish fry is 30±2g / fish.

[0010] In one specific embodiment of the present invention, the water temperature during the aquaculture period is 25~30℃.

[0011] In one specific embodiment of the present invention, the first batch was released in September and went on sale in May of the following year; the second batch was released in November and went on sale in July of the following year; and the third batch was released in January of the following year and went on sale in September of the following year.

[0012] In one specific embodiment of the present invention, after each batch of fish is put on the market, the empty breeding pond is used for the next batch of fish to be divided into separate ponds or temporarily held.

[0013] In one specific embodiment of the present invention, the temporary holding includes a 7-15 day period of fresh water holding using a circulating water system.

[0014] Beneficial Effects: This invention provides a method for staggered market launch of pearl grouper, and for the first time systematically proposes a saline-alkali water preparation process and aquaculture management scheme suitable for pearl grouper. It successfully transforms saline-alkali water resources, which previously constrained agricultural production, into high-value aquaculture resources, breaking the geographical limitations of pearl grouper farming. The method creatively combines precise saline-alkali water preparation, multiple batches of rolling stocking, and dynamic pond management, constructing a new production rhythm adapted to a controllable environment. By innovatively determining the timing and stocking density of pond division based on three different pond sizes (80g, 150g, 250g) and the same stocking time (2 months), and precisely coupling pond division operations with the market launch rhythm, a "relay-style" utilization of the aquaculture ponds is achieved, greatly improving the turnover and utilization rate of fixed assets and reducing the facility cost per unit output. The method also introduces a purified temporary holding mode, cleverly utilizing production gaps, further improving facility utilization and creating additional high profits through quality improvement.

[0015] The method described in this invention has clear steps and well-defined parameters, and can be directly promoted and applied in factories with circulating water facilities in inland saline-alkali areas. By achieving staggered market entry, targeting high-price windows, and improving facility turnover, it significantly reduces investment and operating costs, greatly enhancing the economic feasibility of high-end marine fish farming in inland areas. Ultimately, it achieves the core commercial objective of continuously supplying fish during the high-price period from May to September, and produces "saline-alkali water ecological grouper" with regional characteristics, high brand added value, and extremely significant economic benefits. Detailed Implementation

[0016] This invention provides a method for staggered market launch of pearl giant grouper, in which pearl giant grouper is raised in a factory-style recirculating aquaculture system equipped with a water quality control unit, and the aquaculture water is a prepared saline-alkaline water. From September to November of the following year, a batch of pearl grouper fry is released every 1 to 2 months. Each batch of fry is separated into different ponds when it reaches 80g / fish, 150g / fish and 250g / fish. They are then marketed when they reach 450g / fish. When dividing the ponds, all the empty ponds from the previous batch are used for the ponds of the next batch, and the first batch is required to be launched in May of the following year, and the last batch in September of the following year.

[0017] The pearl giant grouper described in this invention is cultured in a factory-style recirculating aquaculture system equipped with a water quality control unit. The recirculating aquaculture system is equipped with physical filtration, biological filtration, sterilization, temperature control (heating / cooling), oxygenation and other units, which can be set up with reference to the literature (Chen Qing, Guo Qi, Ding Ke, Ding Yunmin, Dou Yaqi, Zhang Qi. Experiment on inland factory-style recirculating aquaculture of pearl giant grouper. Scientific Fish Farming. 2025 (08): 41-42).

[0018] The aquaculture system described in this invention uses formulated saline-alkaline water. This saline-alkaline water originates from local saline groundwater or surface water. After aeration, sedimentation, and filtration to remove suspended solids, it enters a water conditioning tank. Based on the seawater ion composition suitable for the growth of pearl grouper, potassium, magnesium, calcium, and trace elements are specifically added, and the key ion (K) is adjusted. + Mg 2+ Ca 2+ Concentration and potassium-to-sodium ratio (K) + / Na + This ensures that the salinity of the adjusted water remains between 5 and 30‰. + Concentration not less than 200 mg / L, Mg 2+ Concentration not less than 300 mg / L, Ca 2+ The concentration is not less than 200 mg / L, and the pH is stable between 7.8 and 8.5. This invention uses the prepared saline-alkali water as the initial water source and subsequent replenishment water source for the system.

[0019] This invention involves multiple batches of seedlings. Starting from September each year and ending in January of the following year, a batch of pearl grouper fry is released every 1 to 2 months. The time interval can be adjusted to 1.5 to 2 months. In the example, the release is carried out at a time interval of 2 months, forming three consecutive breeding batches, including the first batch (released in September), the second batch (released in November), and the third batch (released in January of the following year).

[0020] In this invention, the fish fry released each time are of the same size, which can be 30±2g / fish. The stocking density can increase with the increase of batch size, or the same number of fish fry can be released in each batch. In one embodiment of this invention, the scheme of releasing the same amount of fish fry is used for illustration, but it should not be regarded as the entire scope of protection of this invention. In one embodiment of this invention, the stocking amount each time is 300 fish / m³. 3 .

[0021] This invention, after stocking, utilizes a system with temperature control facilities to maintain the culture water temperature within the optimal growth range for pearl grouper (25-30℃) and conducts conventional culture. Each batch of fish is divided into three separate ponds at least three times: for example, the first division occurs when the average size reaches 80g / fish, the second when the average size reaches 150g / fish, and the third when the average size reaches 250g / fish. This invention employs a multi-batch stocking and dynamic pond division strategy, so after each batch of fry is raised and marketed, the culture ponds become empty and can be directly used for the next batch of fish, further reducing stocking density and promoting fish growth.

[0022] This invention follows the principle of "first-in, first-out," ensuring that the first batch of fish fry reaches marketable size and is sold by May of the following year, emptying the rearing ponds. After the first batch of fish is released in May, the vacated ponds are immediately used for the second or third batch of fish (released in November), significantly reducing stocking density and promoting rapid growth, aiming for market availability one and a half months later, from late June to early July of the following year. After the second batch of fish is released, the vacated ponds are used together with those from the first batch for the third batch (released in January of the following year). This process continues, with subsequent batches of fish utilizing the vacated ponds from previous batches until the last batch reaches marketable size by September of the following year. The marketable size referred to in this invention is at least 450g per fish.

[0023] In the scheme described in this invention, the concentrated stocking period is from September to January of the following year. Therefore, during the non-concentrated stocking period each year, some vacant breeding ponds that have completed their breeding tasks can be used to temporarily hold pearl grouper or other high-end marine fish that have reached or are close to market size. A circulating water system is used for 7-15 days of clear water temporary holding (with feeding stopped or at a very low feeding rate) to promote the metabolism of potential earthy-smelling substances, improve meat firmness and flavor, and achieve the goal of high-priced market entry. During this stage, the system load is low, operating costs are controllable, and a significant premium can be created.

[0024] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, of a method for the cyclical and staggered marketing of pearl grouper in saline-alkali water recirculating aquaculture system, but these descriptions should not be construed as limiting the scope of protection of the present invention.

[0025] Example 1 This invention was implemented at an aquaculture demonstration base in the 14th Regiment of the First Division of the Xinjiang Production and Construction Corps in Xinjiang Uygur Autonomous Region. The aquaculture workshop has an area of ​​1200m². 2 It contains 20 square cement-bottomed aquaculture ponds with sides of 7m and a water depth of 1.2m, and is equipped with a complete circulating water treatment system and an independent water quality adjustment pond.

[0026] Pretreatment of saline-alkali water: Local saline-alkali groundwater with a mineralization of approximately 8 g / L is extracted, filtered through a sand filter tank, and then introduced into a 100m³ system. 3 Water conditioning tank. After analyzing its basic ion content, potassium chloride (KCl), magnesium chloride hexahydrate (MgCl2·6H2O), and trace amounts of copper sulfate and zinc sulfate were added to the water. After thorough aeration and stirring, the salinity of the water was measured to be 8.7‰, K... + Concentration 210 mg / L, Mg 2+ Concentration 310 mg / L, Ca 2+ Concentration 410 mg / L, pH 8.2. This water will be used as the initial water source and subsequent replenishment water source for the system.

[0027] Table 1. Circular staggered market farming process for pearl grouper according to an embodiment of the present invention.

[0028] The first batch: On September 1, 2023, 35,000 pearl grouper fry with an average size of 30g / fish were released into two rearing ponds, with an initial stocking density of 300 fish / m². 3 The water temperature was maintained at 26±1℃, dissolved oxygen ≥6.5mg / L, total ammonia nitrogen <0.3mg / L, nitrite <0.05mg / L, and pH 7.9~8.3 through temperature control. On November 1, 2023, when the average size reached 80g / fish, the fish were divided into three tanks, and the density was reduced to 200 fish / m³. 3 On January 2, 2024, the average size reached 150g / tail, and the fish were divided into two groups for the second time, occupying 6 groups, with the density reduced to 100 tails / m³. 3 On March 2, 2024, the average size reached 250g / tail, and the fish were divided into 12 ponds for the third time, with the density reduced to 50 tails / m³. 3 By May 3, 2024, the average size of the fish had reached 500 grams per fish, and all of them were put on the market for sale, freeing up 12 breeding ponds.

[0029] The second batch: Fish fry with an average size of 31g / fish were stocked on November 1, 2023, with the same initial density as the first batch. The water conditions were the same as before. On January 2, 2024, when the average size reached 80g / fish, the fish were divided into two groups for the first time; on March 2, 2024, when the average size reached 150g / fish, the fish were divided into two groups for the second time; on May 3, 2024, the fish were divided into three groups using the ponds vacated after the first batch was harvested, with the density reduced to 50 fish / m³. 3 By July 5, 2024, the average weight had reached 510 grams per fish, and all of them were put on the market for sale.

[0030] The third batch was stocked on January 2, 2024. The separate pond operation made full use of the ponds that were vacant after the previous batches were sold, effectively reducing the stocking density at each stage and promoting growth. The fish reached a size of 450-550g and were sold on September 1, 2024.

[0031] Comprehensive utilization of facilities: From September to May of the following year, during the period when the number of ponds occupied by batches of fish in their mid-growth stage that do not yet require separation is relatively small, multiple vacant aquaculture ponds are used for the temporary rearing of commercially available fish. The water temperature is controlled at 26±1℃ for 7-15 days of clean water purification and temporary rearing, during which no feeding is performed. After the temporary rearing, the fish meat is firm and free of muddy taste, and they are sold as high-quality commercial fish at a price 25-30% higher than the market price at the same time. The aquaculture ponds are then quickly emptied to prepare for subsequent separation or the next round of stocking.

[0032] Through this example, the aquaculture base successfully achieved staggered and continuous market supply of pearl grouper from May to September 2024, with an average selling price more than 40% higher than the traditional September-October market season (e.g., the price of pearl grouper in Alar City was 80-100 yuan / jin in May 2024, and 50-60 yuan / jin in October 2025). Simultaneously, additional high-premium profits were obtained through the "purified temporary holding" model. The average annual utilization rate of the aquaculture ponds exceeded 85%, effectively utilizing saline-alkali water resources while increasing overall economic benefits by approximately 40% compared to similar traditional coastal models.

[0033] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for the cyclical and staggered marketing of pearl grouper, characterized in that, Pearl grouper are cultured in a factory-style recirculating aquaculture system equipped with a water quality control unit, using prepared saline-alkali water. From September to January of the following year, a batch of pearl grouper fry is released every 1 to 2 months. Each batch of fry is separated into different ponds when it reaches 80g / fish, 150g / fish and 250g / fish. The fish are then marketed when they reach a size of no less than 450g / fish. When dividing the ponds, all the empty ponds from the previous batch are used for the ponds of the next batch, and the first batch is required to be launched in May of the following year, and the last batch in September of the following year.

2. The method according to claim 1, characterized in that, The salinity of the aquaculture water is 5-30‰, K + Concentration not less than 200 mg / L, Mg 2+ Concentration not less than 300 mg / L, Ca 2+ The concentration should not be less than 200 mg / L, and the pH value should be 7.8~8.

5.

3. The method according to claim 1, characterized in that, The release includes releasing a batch of pearl grouper fry every two months from September of each year to January of the following year, forming at least three consecutive breeding batches, including the first, second and third batches.

4. The method according to claim 3, characterized in that, The number of fish fry released in each batch is the same, or increases as the number of batches increases.

5. The method according to claim 4, characterized in that, The stocking density for each batch of fish fry shall not be less than 300 fish / m³. 3 The average size of the fish fry is 30±2g / fish.

6. The method according to claim 1, characterized in that, During the breeding period, the water temperature is 25~30℃.

7. The method according to claim 3, characterized in that, The first batch was released in September and went on sale in May of the following year; the second batch was released in November and went on sale in July of the following year; the third batch was released in January of the following year and went on sale in September of the following year.

8. The method according to claim 1, characterized in that, After each batch of fish is sold, the empty breeding ponds are used for the next batch of fish to be divided into separate ponds or temporarily held.

9. The method according to claim 8, characterized in that, The temporary holding includes a period of 7 to 15 days of fresh water holding using a circulating water system.

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