CN106879520B - Method for improving survival rate of larvae in industrial artificial breeding of portunus trituberculatus - Google Patents
Method for improving survival rate of larvae in industrial artificial breeding of portunus trituberculatus Download PDFInfo
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- CN106879520B CN106879520B CN201710089567.4A CN201710089567A CN106879520B CN 106879520 B CN106879520 B CN 106879520B CN 201710089567 A CN201710089567 A CN 201710089567A CN 106879520 B CN106879520 B CN 106879520B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- 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 relates to a method for improving the survival rate of larvae in industrial artificial breeding of portunus trituberculatus. The method comprises the following steps: selecting loess without pollution on land, parching at high temperature with big iron pan to sterilize, and making loess into surface soil; naturally cooling the fried land soil, sieving with a 20-mesh sieve, removing large impurities, and bagging for later use; after the crab larva is completely transformed into the megalops, adding water into the fried land soil according to the amount of 100 g per cubic meter of water body to dilute the crab larva into porridge, and sprinkling the mixture in the whole pool once a day until the megalops is completely transformed into the first-stage crab larva; other seedling raising processes are carried out according to a conventional seedling raising method. According to the invention, on the basis of improving the bait utilization rate, reducing the illumination intensity in the pond and increasing attachments, the overland soil is splashed to change the seawater turbidity of the seedling pond, so that mutual killing in the period of megalopa larvae is reduced, compared with the method of throwing the overland soil, the larva survival rate can be improved by 30-50%, and the production cost is increased very low.
Description
Technical Field
The invention relates to a portunus trituberculatus factory artificial breeding technology, in particular to a method for improving the survival rate of larvae in the factory artificial breeding of portunus trituberculatus.
Background
In the industrial artificial breeding process of the portunus trituberculatus, crab larvae are transformed into megalops from flea larvae, the morphological change is large, and meanwhile, the ecological change is also generated. The obvious ecological habit is the same kind of habit of self-disabled movement and capturing other objects at the later stage, and the death of larval is often caused, which is the most dangerous period in the seedling production process.
The portunus trituberculatus larva has developed chela from the development stage to the larval stage, the life habit of the portunus trituberculatus larva is greatly changed, the swimming speed is high, the visual field range is wide, and the predation capacity is enhanced. Observation shows that the larvae have the habit of holding and biting each other at the middle and later stages of Z5, and if the synchronism of Z5 becomes large eye larvae, the large eye larvae eat the Z5 which is not changed. The larger the larva density is, the less the bait is, and the more serious the mutual mutilation phenomenon is. Even if the bait is sufficient, the larvae still can be killed mutually, and the relative ratio of the larvae to the illumination intensity in the pool is formed, the stronger the illumination in the pool is, the more serious the larvae are killed mutually, otherwise, the larvae are light. Especially, the mutual killing in the juvenile crab period is violent, and the technical key for improving the survival strings of the seedlings is to adopt preventive measures.
At present, three measures for reducing mutual killing in the period of larval are provided, namely, the utilization rate of bait is improved, and palatable bait which is easy to hold by Z5 and M, such as a live fairy shrimp adult or a frozen fairy shrimp adult, can float in water due to the characteristic of frigid fur, and is suitable for holding by Z5 and M. The daily bait feeding amount is 150-300% of the weight of the larva. In order to ensure that the frozen baits are fully ingested and do not sink to the bottom of the pond, the number of feeding times per day is increased to 10-15 times, and the larvae can capture palatable baits at any time. Secondly, the illumination intensity in the pond is reduced in the later stage of seedling culture. Before the pond is degenerated into a large-eye larva, the diatom is added in time to reduce the illumination intensity, and the top of the seedling raising chamber is provided with a sun-shading cloth to avoid direct light. Thirdly, attachments are increased. Before the megalops become young crabs, nontoxic meshes can be hung to facilitate the adhesion of the young crabs, 3-4 meshes are hung in each pond, the length of each mesh is the same as the width of the pond, and the height of each mesh is 30cm lower than the depth of the pond.
The three methods of improving the bait utilization rate, reducing the illumination intensity in the pond and increasing attachments reduce mutual killing in the period of megalopas to a certain extent and improve the survival rate of the megalopas, but increase the production cost.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for changing the seawater turbidity of a nursery pond by splashing land soil from the young crabs just appearing in the period from the appearance of the megalopas to the I period based on the ecological characteristic change of the megalopas in the period, so that the visual field is reduced, mutual killing is reduced, and the survival rate of the larvae in the industrial artificial breeding of the blue crabs is effectively improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for improving the survival rate of the larvae in the industrial artificial breeding of the portunus trituberculatus comprises the following steps:
(1) preparing loess by selecting loess without pollution, parching at high temperature in a big iron pan to sterilize and make loess into surface soil; naturally cooling the fried land soil, sieving with a 20-mesh sieve, removing large impurities, and bagging for later use;
(2) sprinkling land soil: after the crab larva is completely transformed into the megalops, adding water into the fried land soil according to the amount of 100 g per cubic meter of water body to dilute the crab larva into porridge, and sprinkling the mixture in the whole pool once a day until the megalops is completely transformed into the first-stage crab larva;
(3) other seedling raising processes are carried out according to a conventional seedling raising method.
Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:
on the basis of the three methods of improving the utilization rate of bait, reducing the illumination intensity in the pond and increasing attachments, the method adopts splashing land soil to change the turbidity of seawater in the seedling pond, reduces mutual killing in the period of megalops and improves the survival rate of the larvae. Compared with the method of throwing 'land soil', the survival rate of the larvae can be improved by 30-50%, and the increase of the production cost is very low.
Further, the preferred scheme of the invention is as follows:
adding an ecological preparation for improving water quality when land soil is diluted; the ecological preparation comprises photosynthetic bacteria and bacillus. The land soil is mixed with ecological preparations such as photosynthetic bacteria, bacillus and the like for improving water quality, so that the effect is better.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the present invention in any way.
The method for improving the survival rate of the larvae in the industrial artificial breeding of the portunus trituberculatus of the embodiment specifically comprises the following steps:
(1) selecting loess without pollution on land, and parching at high temperature with a big iron pan to dry, which can not only sterilize, but also form loess into surface soil. Naturally cooling the fried land soil, screening by a 20-mesh sieve, removing large impurities, and bagging for later use.
(2) From the beginning to the later half of the megalopa larva, after the juvenile crab is completely transformed into the megalopa larva, adding water into the fried 'land soil' according to the amount of 100 g per cubic water body to dilute the 'land soil' into porridge, and sprinkling the mixture in the whole pool once a day until the megalopa larva is completely transformed into the first-stage juvenile crab.
(3) The ecological preparation for improving water quality, such as photosynthetic bacteria, bacillus and the like, is mixed when land soil is diluted, and the effect is better.
(4) The seedling raising method can adopt a conventional seedling raising procedure.
By implementing the technology, the survival rate of the larvae can be improved by 30-50%.
The above examples are merely illustrative of the present invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (1)
1. A method for improving the survival rate of the larvae in the industrial artificial breeding of the blue crabs is characterized by comprising the following steps:
(1) preparing loess by selecting loess without pollution, parching at high temperature in a big iron pan to sterilize and make loess into surface soil; naturally cooling the fried land soil, sieving with a 20-mesh sieve, removing large impurities, and bagging for later use;
(2) sprinkling land soil: after the crab larva is completely transformed into the megalops, adding water into the fried land soil according to the amount of 100 g per cubic meter of water to dilute the crab larva into porridge, and sprinkling the mixture in the whole pool once a day until the megalops is completely transformed into the I-stage crab larva; adding an ecological preparation for improving water quality when land soil is diluted, wherein the ecological preparation comprises photosynthetic bacteria and bacillus;
(3) other seedling culture processes: the method is carried out according to a conventional seedling raising method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710089567.4A CN106879520B (en) | 2017-02-20 | 2017-02-20 | Method for improving survival rate of larvae in industrial artificial breeding of portunus trituberculatus |
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| CN201710089567.4A CN106879520B (en) | 2017-02-20 | 2017-02-20 | Method for improving survival rate of larvae in industrial artificial breeding of portunus trituberculatus |
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| CN106879520A CN106879520A (en) | 2017-06-23 |
| CN106879520B true CN106879520B (en) | 2020-04-03 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790965A (en) * | 2010-02-04 | 2010-08-04 | 浙江省海洋水产研究所 | Artificial culture method for Portunus trituberculatus |
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- 2017-02-20 CN CN201710089567.4A patent/CN106879520B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790965A (en) * | 2010-02-04 | 2010-08-04 | 浙江省海洋水产研究所 | Artificial culture method for Portunus trituberculatus |
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