A method for culturing broodstock of konju (Hucho taranus)

Abstract

The application discloses a breeding method of round-mouthed crucian carp broodfish, which comprises the following steps: 1. In July of the current year, select female round-mouthed crucian carp and male round-mouthed crucian carp which are healthy, have no injury on the body surface and are 5 years old or above for breeding; 2. Disinfect the round-mouthed crucian carp broodfish, and then put the round-mouthed crucian carp broodfish into a breeding barrel of an indoor circulating water aquaculture system with a temperature control function for breeding, wherein the initial breeding density is less than or equal to 15 kg / m 3 3. In the breeding process of the round-mouthed crucian carp broodfish, water temperature regulation, light and feeding management are carried out. According to the temperature requirement of the gonad development and feeding of the round-mouthed crucian carp, the water temperature in the breeding process of the round-mouthed crucian carp broodfish is regulated, especially when the water temperature begins to drop with the air temperature in October-December, the water temperature is regulated to be kept at 20-22 DEG C through the temperature control function of the aquaculture system, the annual feeding time of the round-mouthed crucian carp broodfish is prolonged, the gonad development of the round-mouthed crucian carp broodfish is ensured, and the breeding effect of the round-mouthed crucian carp broodfish in the indoor circulating water aquaculture system is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of Coreius guichenoti breeding, and particularly relates to a Coreius guichenoti broodfish breeding method. BACKGROUND

[0002] Coreius guichenoti belongs to the Cypriniformes, Cyprinidae, Acheilognathinae and Coreius, is a species endemic to the upper reaches of the Yangtze River, and was once the main economic fish in the upper reaches of the Yangtze River. At present, the natural population resource of Coreius guichenoti is seriously attenuated, and the extinction risk is increasing. Realizing the large-scale artificial breeding of Coreius guichenoti to carry out artificial propagation and release becomes one of the inevitable choices for protecting and restoring the population resource of Coreius guichenoti.

[0003] The broodfish breeding work is related to the growth and annual gonadal development of broodfish, and is one of the key factors affecting artificial breeding. At present, there are few reports on the broodfish breeding of Coreius guichenoti. Only the report of breeding Coreius guichenoti broodfish in a Yangtze River ship body net cage is found, but this breeding method is easily limited by the breeding site. SUMMARY

[0004] Based on the above prior art, the application provides a Coreius guichenoti broodfish breeding method, which is simple, convenient to operate, and can effectively improve the survival rate and maturation rate of Coreius guichenoti.

[0005] The technical scheme adopted to achieve the above-mentioned purpose of the application is as follows:

[0006] A Coreius guichenoti broodfish breeding method comprises the following steps:

[0007] 1. In July of the year, select female Coreius guichenoti and male Coreius guichenoti which are 5 years old or above, are healthy, have no injuries on the body surface, and are used for breeding;

[0008] 2. The Coreius guichenoti broodfish is disinfected, and then is put into a breeding barrel of an indoor breeding system with a temperature control function for breeding, and the initial breeding density is ≤15 kg / m 3 ;

[0009] 3. In the breeding process of the Coreius guichenoti broodfish, the water temperature, light and feed management are as follows:

[0010] The water temperature is controlled as follows: the water temperature is 20-24℃ from July to September of the year, the water temperature is 20-22℃ from October to December of the year, from the end of December of the year to the beginning of January of the next year, the water temperature is reduced to below 16℃ at a speed of ≤1-2℃ / d, the water temperature is below 16℃ from January to February of the next year, the water temperature is 14-22℃ from March to April of the next year, the water temperature is 19-23℃ from May to June of the next year, and the annual accumulated temperature is >1.5×10 5 ℃▪h;

[0011] The natural light period is adopted, and the light intensity is 0-450 Lux.

[0012] The artificial compound feed with a protein content of 42% or more is fed to the round gudgeon brood fish during the cultivation period, and the feeding amount is 0.5% to 2% of the body weight of the round gudgeon brood fish, and the round gudgeon brood fish is fed at 8:00 and 18:00 every day.

[0013] Further, the round gudgeon brood fish is 5 years old or older.

[0014] Further, the female-to-male ratio of the round gudgeon brood fish is 1:1 to 2:1.

[0015] Further, the diameter of the cultivation barrel is greater than or equal to 2 m, and the water depth is 0.7 to 1 m.

[0016] Further, the cultivation water meets the requirements of the Fishery Water Quality Standard (GB11607-89), wherein the dissolved oxygen is greater than or equal to 6 mg / L, the pH is 6.5 to 8.5, the ammonia nitrogen is less than 0.1 mg / L, and the nitrite nitrogen is less than 0.05 mg / L.

[0017] Further, the round gudgeon brood fish is disinfected with a 1% to 3% salt solution.

[0018] Compared with the prior art, the advantages and beneficial effects of the present application are as follows:

[0019] The method adjusts the water temperature in the cultivation process of the round gudgeon brood fish according to the temperature requirements of the gonadal development and feeding of the round gudgeon, especially when the water temperature begins to drop with the air temperature in October to December, the water temperature is adjusted to 20 to 22 DEG C through the temperature control function of the cultivation system, the annual feeding time of the round gudgeon brood fish is prolonged, the gonadal development of the round gudgeon brood fish is ensured, and the cultivation effect of the round gudgeon brood fish in the indoor circulating water cultivation system is significantly improved. Tests show that the survival rate of the round gudgeon brood fish can reach more than 90%, and the maturation rate of the female brood fish can reach 70%. DETAILED DESCRIPTION

[0020] The present application will be described in detail below in combination with specific examples.

[0021] Example 1

[0022] 1. In July 2019, 75 round gudgeon brood fish with healthy bodies, no wounds on the body surface and 5-6 years old were selected, including 45 female round gudgeon brood fish, and the average body weight of the round gudgeon brood fish was (808.03±143.92) g per tail.

[0023] 2. The round gudgeon brood fish was disinfected with a 2% salt solution for 15 minutes, and then was put into three cultivation barrels with a temperature control function in the indoor cultivation system for cultivation, and the stocking densities were 9.3 kg / m 3 , 10.1 kg / m3 10.4 kg / m 3 The breeding barrel has a diameter of 2 m, the breeding water in the breeding barrel is aeration tap water, the dissolved oxygen in the water body is 6.2-10.98 mg / L, the pH is 7.5-8.2, the ammonia nitrogen is 0.03-0.08 mg / L, the nitrite nitrogen is 0.003-0.026 mg / L, and the average water depth is 0.75 m throughout the year;

[0024] 3. In the breeding process of Procyprinus, the water temperature, light and feed are scientifically controlled according to the temperature requirements of the gonadal development and feeding of Procyprinus, as follows:

[0025] The water temperature is controlled as follows: from July to September 2019, the water temperature is 20.7-23.2℃, from October 1, 2019 to December 29, 2019, the water temperature is 20.1-20.9℃, from December 30, 2019, the water temperature is reduced by 1.7-2℃ / d, until the water temperature is reduced to below 16℃, from January to February 2020, the water temperature is 9.3-14.9℃, from March to April 2020, the water temperature is 14.1-21.8℃, from May to June 2020, the water temperature is 19.5-23℃, and the annual accumulated temperature is >1.59×10 5 ℃▪h;

[0026] The natural light period is adopted, and the light intensity is 0-440 Lux;

[0027] During the breeding of the parent fish, artificial compound feed with a protein content of ≥42% is fed, and the feeding amount is 0.5%-2% of the fish body weight, which is increased or decreased according to the feeding condition of each day, and each feeding is carried out at 8:00 and 18:00 every day;

[0028] 4. On June 1, 2020, the breeding of Procyprinus was completed, and 72 parent fish of Procyprinus survived, of which 43 were female fish, 31 were mature, and the maturation rate was 72.09%.

[0029] Example 2

[0030] 1. In July 2020, 72 parent fish of Procyprinus with healthy bodies, no wounds on the body surface and 6-7 years old were selected, including 36 female parent fish of Procyprinus, and the average weight of the parent fish of Procyprinus was (950.45±192.17) g per tail;

[0031] 2. The parent fish of Procyprinus was disinfected with a 2% salt solution for 15 minutes, and then put into three breeding barrels with temperature control function in the indoor breeding system for breeding, and the stocking density was 9.7 kg / m 3 10.5 kg / m 3 10.8 kg / m 3The breeding barrel has a diameter of 2 m, the breeding water in the breeding barrel is aeration tap water, the dissolved oxygen in the water body is 6.1-11.2 mg / L, the pH is 7.6-8.3, the ammonia nitrogen is 0.03-0.09 mg / L, the nitrite nitrogen is 0.003-0.03 mg / L, and the average water depth is 0.75 m throughout the year;

[0032] 3. In the breeding process of Procypris merus, the water temperature, light and feed are scientifically controlled according to the temperature requirements of the gonadal development and feeding of Procypris merus, as follows:

[0033] The water temperature is controlled as follows: from July to September 2020, the water temperature is 20.1-23.5℃, from October 1, 2020 to December 29, 2019, the water temperature is 20.1-20.8℃, from December 30, 2019, the water temperature is reduced at a rate of ≤1.7-2℃ / d until the water temperature is reduced to below 16℃, from January to February 2020, the water temperature is 10-15.9℃, from March to April 2020, the water temperature is 14.2-21.7℃, from May to June 2020, the water temperature is 19.1-22.8℃, and the annual accumulated temperature is >1.63×10 5 ℃▪h;

[0034] The natural light period is adopted, and the light intensity is 0-420 Lux;

[0035] During the breeding of the parent fish, artificial compound feed with a protein content of ≥42% is fed, and the feeding amount is 0.5%-2% of the fish body weight, which is increased or decreased according to the feeding condition of each day, and each feeding is carried out at 8:00 and 18:00 every day;

[0036] 4. On June 1, 2021, the breeding of Procypris merus was completed, and 70 parent fish of Procypris merus survived, of which 36 were female fish, 27 were mature, and the maturation rate was 75%.

[0037] The inventors of the present application have successfully bred parent fish of Spinibarbus longipinnis by using an indoor breeding system, but the maturation rate of female parent fish is not higher than 30% when the breeding method of Spinibarbus longipinnis is used to breed parent fish of Procypris merus.

Claims

1. A method for cultivating broodstock of the round-mouthed copper fish, characterized in that... Includes the following steps: 1.1 In July of that year, select healthy female and male round-mouthed copper fish that are 5 years old or older and have no external injuries for breeding. 1.

2. Disinfect the broodstock of the round-mouthed copper fish and place them in a rearing tank of an indoor recirculating aquaculture system with temperature control for cultivation. The initial stocking density should be ≤15kg / m³. 3 ; 1.3 During the rearing of broodstock of the round-mouthed copper fish, the water temperature control, lighting, and feeding management are as follows: Water temperature control is as follows: From July to September, the water temperature should be 20-24℃; from October to December, the water temperature should be 20-22℃; from the end of December to the beginning of January of the following year, the water temperature should be lowered to below 16℃ at a rate of ≤2℃ / day; from January to February of the following year, the water temperature should be below 16℃; from March to April of the following year, the water temperature should be 14-22℃; and from May to June of the following year, the water temperature should be 19-23℃. Annual accumulated temperature should be >1.5×10⁻⁶. 5 ℃▪h; Natural photoperiod is used, with a light intensity of 0-450 Lux; During the rearing period of the broodstock of the round-mouthed copper fish, feed them with artificial compound feed containing ≥42% protein, at a rate of 0.5% to 2% of their body weight, twice a day at 8:00 and 18:

00.

2. The method for cultivating broodstock of the round-mouthed copper fish according to claim 1, characterized in that: The parent fish of the round-mouthed copper fish are 5 years old or older.

3. The method for cultivating broodstock of the round-mouthed copper fish according to claim 1, characterized in that: The ratio of male to female parent fish of the round-mouthed copper fish is 1:1 to 2:

1.

4. The method for cultivating broodstock of the round-mouthed copper fish according to claim 1, characterized in that: The diameter of the breeding tank is ≥2m and the water depth is 0.7-1m.

5. The method for cultivating broodstock of the round-mouthed copper fish according to claim 1, characterized in that: The broodstock of the round-mouthed copper fish were disinfected with a salt solution with a mass percentage concentration of 1%-3%.