The method of adjusting the water quality of the eel pond in the net cage

An adjustment method and water quality technology, applied in chemical instruments and methods, botany equipment and methods, fish farming, etc., can solve the problems of easy deterioration of water quality in cages, affecting the growth of ricefield eels, stress response of ricefield eels, etc., and achieve Improve the utilization rate of water body, maintain high activity, and improve the effect of dissolved oxygen

Active Publication Date: 2021-08-24
ZHEJIANG OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cage culture of rice field eel is currently the main breeding method of rice field eel in my country. This farming method has the following disadvantages: (1) The feed for rice field eel is high-protein compound feed and surimi, and rice field eel excrement and residual feed pollute water quality greatly; ( 2) The mesh is small, generally 30 mesh / square centimeter, which is easily blocked by sludge, algae, and eel excrement. The water exchange inside and outside the cage is poor, and the water quality in the cage is easy to deteriorate; High morbidity, slow growth, large feed coefficient, low benefit, and high risk of breeding
The water quality adjustment of traditional cage culture of rice field eels is mainly based on changing water and splashing quicklime water. 1) Changing water pollutes the environment. If more than 1 / 3 of water is changed at one time, it is easy to cause stress reaction of rice field eels, and it is difficult to carry out in places with poor water sources; Acidic environment, quicklime water is alkaline, large amount or frequent use will affect the growth of eel

Method used

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  • The method of adjusting the water quality of the eel pond in the net cage
  • The method of adjusting the water quality of the eel pond in the net cage
  • The method of adjusting the water quality of the eel pond in the net cage

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Effect test

Embodiment 1

[0037] The water quality regulator of immobilized probiotics contains chitosan-modified functional shell materials and probiotics carried on the shell materials. The water quality control agent uses the probiotics in it to degrade harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide in the water body. At the same time, it can also use functional shell materials to perform physical adsorption and ion exchange to remove heavy metal ions in the water body. pollution, improve water quality, and probiotics can also be used as basic bait or feed additive for animals to eat, reduce bait input, and achieve the purpose of waste utilization, ecological balance and healthy breeding.

[0038] The functional shell material is calcined and water reformed before being modified by chitosan; the calcining temperature is 500°C for 2 hours in an oxygen-free environment; the water reforming temperature is 150°C for 24 hours and the reactor used is polytetrafluoroethylene Eth...

Embodiment 2

[0054] The method for adjusting the water quality of eel ponds in cages specifically includes the following steps:

[0055] 1) Periodic use of immobilized probiotic water quality regulator, once every two months, with an amount of 350mg / m 3 Cage;

[0056] 2) Stocking silver carp, bighead carp and pomfret in the water outside the cage, the initial stocking density is 20 fish / m 3 , with an average weight of 60g;

[0057] 3) Periodically transplant and renew galeria and hornwort, and the cycle of transplanting and renewing is 60 days.

[0058] The preparation steps of the immobilized probiotic water quality control agent used in the above-mentioned regulating method are as follows:

[0059] 1) Clean the shells, soak them in 0.5% hydrochloric acid solution for 10 hours, then place them in a tube furnace at 600°C for anaerobic calcination for 1 hour, take them out and cool them, crush them through a 110-mesh sieve, and pour them into Add 10 times the amount of potassium carbona...

Embodiment 3

[0065] The method for adjusting the water quality of eel ponds in cages specifically includes the following steps:

[0066] 1) Periodic use of immobilized probiotic water quality regulator, once every 1.5 months, with a dosage of 450mg / m 3 Cage;

[0067] 2) Stocking silver carp, bighead carp and pomfret in the water outside the cage, the initial stocking density is 15 fish / m 3 , with an average weight of 110g;

[0068] 3) Periodically transplant and renew galeria and hornwort, and the cycle of transplanting and renewing is 50 days.

[0069] The preparation steps of the immobilized probiotic water quality control agent used in the above-mentioned regulating method are as follows:

[0070] 1) After cleaning the shells, soak them in 0.2% hydrochloric acid solution for 11 hours, then place them in a tube furnace with a temperature of 550°C for anaerobic calcination for 1.5 hours, then take them out and cool them, crush them through a 120-mesh sieve, and then Add 7 times the am...

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Abstract

The invention provides a method for adjusting the water quality of eel ponds raised in net cages, comprising: periodically using immobilized probiotic water quality regulators; stocking filter-feeding fish and / or scraping-feeding fish in the water body outside the net cage; periodically transplanting and renewing the sediment water plants. The above-mentioned immobilized probiotic water quality control agent includes a functional shell material modified by chitosan, and the probiotic bacteria carried on the shell material; the specific surface area of ​​the above-mentioned functional shell material before being modified by chitosan is 1.0~2.0m 2 / g, the average pore diameter is 0.5~45nm. The adjustment method provided by the invention comprehensively utilizes probiotic water quality control agents, stocking ecologically functional fish, and biological treatment, improves the water quality of eel ponds in cages, improves the utilization rate of water bodies, harvests fish and plants for water transfer, and improves economic benefits; water quality The regulator has good dispersion, many modification sites, strong adsorption capacity and water retention performance, high degree of immobilization of probiotics, can maintain high activity of probiotics, and prolong storage time.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a method for adjusting the water quality of eel ponds in net cages. Background technique [0002] Field eel, commonly known as eel, belongs to Teleost, Synbranchia, Synbranchidae, and Field Eel. It is mainly distributed in China, Vietnam, North Korea, Thailand, and Japan. It is the main freshwater aquatic product in my country. Eel is one of the famous and high-quality fish that has developed very rapidly in recent years in my country. Its main breeding areas are located in Hubei, Hunan, Anhui, Jiangxi, Zhejiang and other provinces in the middle and lower reaches of the Yangtze River. Eel farming has become one of the leading industries in aquaculture in these regions. [0003] For a long time, there are three main methods of artificial breeding of rice field eels: pond culture, paddy field culture and net cage culture; Setting cages in ponds to culture rice fie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34A01K61/10A01G22/00C02F101/20C02F103/20
CPCA01K61/10A01G22/00C02F3/34C02F3/347C02F3/348C02F2101/20C02F2103/20Y02A40/81
Inventor 鲁敏陈晋杨潇景斐张建设
Owner ZHEJIANG OCEAN UNIV
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