CN111771782A

CN111771782A - Artificial seedling culture method for yellow mud snails

Info

Publication number: CN111771782A
Application number: CN202010635746.5A
Authority: CN
Inventors: 郑亮; 隋延鸣; 杨立国; 秦搏; 宋学锋; 吴艳庆; 英娜
Original assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Current assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-10-16
Anticipated expiration: 2040-07-03
Also published as: CN111771782B

Abstract

The invention relates to an artificial breeding method of yellow mud snails, which mainly comprises the steps of yellow mud snail egg collection, hatching, young snail cultivation and the like. The invention sets different feeds at different growth stages of the yellow mud snail according to the characteristics of the yellow mud snail, is matched with corresponding growth places, has small stimulation to the yellow mud snail, high survival rate, complete growth and simple and convenient operation, and is suitable for practical production.

Description

Artificial seedling culture method for yellow mud snails

Technical Field

The invention belongs to the field of snail seedling culture, and particularly relates to an artificial seedling culture method for yellow mud snails.

Background

The yellow mud snail is one of the important economic snails in coastal areas of Jiangzhe and Zhejiang, and is popular with people because of high protein content, rich nutrient substances and delicious taste. Drunk mud snail and pickled mud snail are particularly famous appetizing pickles in Jiangzhe and Zhejiang provinces. Secondly, the yellow mud snail grows in the intertidal zone of the coastal beach, mainly takes benthic algae, bacteria and organic debris as food, and has important balance function on the stability of the ecological system of the beach. Therefore, the yellow mud snail has important economic value and ecological value for human life. In recent years, with the exhaustion of yellow mud snail resources, the capture amount of yellow mud snails on coastal mudflat is reduced year by year due to the transitional fishing of human activities, so that the research on the artificial yellow mud snail breeding technology is imperative to compensate and protect yellow mud snail species.

Patent CN201710086179 discloses an artificial breeding method for melon snails, which comprises parent snail selection, parent snail cultivation, spawning parent snail cultivation, young snail cultivation and other technologies. CN201810246105 discloses an artificial breeding method of escargots, which comprises a technology for breeding a large amount of escargots seedlings by preparing attachment base with benthic diatoms, collecting and hatching fertilized eggs, and managing breeding.

However, no artificial breeding technology for yellow mud snails is disclosed in China at present.

Disclosure of Invention

The invention aims to solve the technical problem of providing an artificial breeding method of yellow mud snails, starts from the aspects of yellow mud snail egg collection, hatching, young snail breeding and the like, and fills the blank in the prior art.

The invention provides an artificial breeding method of yellow mud snails, which comprises the following steps:

(1) transferring the yellow mud snails which are about to enter the breeding period into a cement pond, keeping constant flow water in the cement pond, fully aerating, feeding ice rotifers every day to reach 1-2/mL, and collecting follicles discharged by the yellow mud snails;

(2) transferring the collected yellow mud snail eggs to glass fiber reinforced plastic, flowing water, fully aerating, incubating for 6-7 days, and waiting for the eggs of the bread plate larva to break;

(3) filtering chorion debris when all the larvae in the follicles emerge by breaking eggs, dayflies in glass fiber reinforced plastic, while adding bacillus in water;

(4) continuously incubating the larva in glass fiber reinforced plastic, feeding golden algae, and incubating until the larva is converted into a three-layer snail stage;

(5) transferring young snails in the period of three layers of snails to another cement pond by siphoning, and feeding diatom and spirulina powder every day;

(6) when the young snail individual reaches 3-5mm, the young snail individual is transferred to a mud flat or muddy pool to be cultured into the young snail.

5cm of spun yarn is paved on the cement pond in the step (1), and the water level is 40 cm.

And (4) filtering in the step (3) by using a filter screen of 20 meshes.

And (4) feeding 5-8 golden algae per ml of water body.

5cm of spun yarn is paved on the cement pond in the step (5), and the water level is 15-20 cm.

Aiming at the special growth characteristics of the yellow mud snails, the invention adopts measures of respectively providing a proper amount of frozen rotifer and golden algae baits for a parent in an ovulatory period and a larva in a growing period, and adding bacillus and the like after aerating and breaking eggs of the larva in an incubation process, so that the yellow mud snails fully obtain nutrition and proper settlement conditions in the breeding process, the influence of the deterioration of the breeding water environment on the breeding process is prevented, and the growth speed and the incubation rate of the yellow mud snails are greatly improved.

Advantageous effects

(1) Aiming at the special growth characteristics of the yellow mud snails, the invention respectively provides different baits with proper quantity for the parent in the ovulatory period and the larva in the growing period, the frozen rotifer can provide sufficient nutrition for the yellow mud nut body in the ovulatory period, and the chrysophyceae is the high-quality initial bait for the young snails in the growing period; the invention ensures the nutrition supply and prevents the culture water environment from deteriorating by providing the frozen rotifer and a proper amount of chrysophyceae;

(2) the invention improves the conventional standing incubation mode in the snail breeding, ensures that the snail eggs do not agglomerate through aeration, fully supplies oxygen to the egg bodies, and improves the incubation rate of the snail eggs; after the eggs of the larvae of the yellow mud snails are broken, the step of adding bacillus into the culture water body is added, so that organic debris can be fully decomposed, and the deterioration of the water body environment is prevented;

(3) the method can be applied to the large-scale artificial breeding of the yellow mud snails, has small stimulation to the yellow mud snails, high survival rate, complete growth and simple and convenient operation, and is suitable for actual production.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Example 1

1. Collecting yellow mud snail eggs

Cleaning 250 individual mature bullacta exarata in 30 days 6 months in a year, drying in the shade for 8 hours, placing in a spawning basin for 25-30 bullacta exarata, inflating for spawning, feeding frozen rotifers with concentration equivalent to 1-2/mL every day, and observing the ovulation status of the bullacta exarata uninterruptedly. 7 months and 7 days, discharging sperm eggs from part of parent snails, observing part of eggs by using a microscope after about 1 hour of spawning, fertilizing most of eggs, taking out mud snails from a spawning basin, transferring the eggs to a blue glass jar with the width of 1.9m, the length of 2.5m and the depth of 0.8m, adding filtered seawater 40cm into the jar, and keeping the egg laying density of about 0.2 grains/mL, wherein the constant running water in a cement pond is kept during the period, the aeration is carried out fully, the water flow in the jar rolls so that the eggs are continuously rolled in the water, and the follicle sinking and aggregation are avoided.

2. And 7, after the eggs are incubated in a glass jar for 7 days in 7 months and 14 days, the developing larva of the follicle in the face plate is observed under a microscope, the constant flow water is closed to avoid the hatched larva from flowing out along with the water flow, and the observation is waited until the ovum of the face plate is broken.

3. And in 7-18 months, all the larvae in the follicles are broken eggs and discharged, the plankton in the blue glass jar is fished out of the jar by using a 20-mesh filter screen, simultaneously bacillus is added into the water to fully decompose the organic matters of the egg membranes remained in the water, so that the water quality is prevented from deteriorating, 1/5 of seawater is discharged by using a valve switch on the inner side of the bottom of the blue glass jar, newly filtered seawater is added to 40 centimeters, and the water is changed once a day after 7-19 months, wherein the water change amount is 1/5 of the total water amount.

4. Continuously hatching in a blue glass jar, and feeding golden algae to ensure that each larva has 5-8 golden algae per day. Most of the larvae develop to the period of three spires in 7/21 days (can swim in water and crawl, and double eyepoints and tentacles appear).

5. And 7, in 22 days after 7 months, transferring the larvae in the period of three spirillum layers to a cement pond with 5cm of sterilized fine sand paved at the bottom and 15-20cm of filtered seawater by siphonage, and keeping the density of the larvae at 15-20/mL. The cement pond is an open cement pond (seedling pond) with the width of 2.3m, the length of 3.0m and the depth of 1.2m, an adhesive base is put into the pond and is a plastic film with the width of 1m and the length of 1m, a rubber band is used for wrapping stones in the middle of the pond, and the pond is evenly placed at the bottom of the seedling pond at intervals of 25-30 cm. The top of the seedling raising pond is provided with a sun-proof net, and the sun-proof rate is 90 percent. Feeding diatom and spirulina powder every day, wherein the concentration of the diatom is 5-7 ten thousand per mL, water is changed once every day by a valve switch on the inner side of the bottom of the nursery pond after 23 months from 7, the water change amount is 1/3 of the total water amount, and the young snails can crawl in the sediment after 25 days after 7 months.

6. And transferring the young snails in the breeding pond to a mud flat or muddy pond for snail formation when the size of the young snails in the breeding pond reaches 3-5mm in 9 months and 30 days.

The artificial breeding of the yellow mud snails is carried out by the method, and more than 20 million mud snail seedlings are bred in total. The hatching rate reaches 100 percent, and the survival rate is more than 95 percent.

Claims

1. An artificial breeding method of yellow mud snails comprises the following steps:

2. The method of claim 1, wherein: 5cm of spun yarn is paved on the cement pond in the step (1), and the water level is 40 cm.

3. The method of claim 1, wherein: and (4) filtering in the step (3) by using a filter screen of 20 meshes.

4. The method of claim 1, wherein: and (4) feeding 5-8 golden algae per ml of water body.

5. The method of claim 1, wherein: 5cm of spun yarn is paved on the cement pond in the step (5), and the water level is 15-20 cm.