72results about How to "Increase perversion rate" patented technology

The invention relates to the field of Rapana venosa artificial breeding, in particular to a Rapana venosa ecological breeding method. The method comprises: transferring egg bags into a plastic basket or net cage (10-20mesh) for suspended hatch in a nursery pond and charging air continuously, wherein the density of the egg bags is 5,000 to 8,000/m<3>; breeding larvae at a density of 1/ml with bait made of chlamydomonas (diatom and tetraselmis are preferred) in an amount of 1.0 to 12.0*10<4>/ml every day at a water temperature of 22 to 26 DEG C; continuously charging air, changing 1/2 of water every day; and when the larvae grow three whorls to a size of 700 to 800 micrometers, placing the larvae in to 60-mesh net bags, cages or tanks together with double-shell spats (animal baits for transformed Rapana venosa) for sea breeding.

The invention relates to a treatment method of middle-late stage attaching bases in shellfish seedling breeding, in particular to a method for treating the attaching bases (mesh sheets, red palm ropesand the like) of shellfish (scallops, mussels, arca inflata reeves and the like) by using the benthic diatom film method, thereby greatly improving the larval attaching rate and the metamorphosis rate. The method has convenient operation and can treat a large number of attaching bases. The treatment method and the attaching bases after treatment have no pollution and are safe and environment-friendly; more importantly, the seedling attaching effect is significantly better than the attaching bases treated by using the traditional method.

The invention relates to a method for culturing a Stichopus japonicus seed, which belongs to the technical field of a Stichopus japonicus seed culturing method and comprises the following steps of (1) fishing and catching; (2) screening; (3) transporting and (4) culturing the Stichopus japonicus seed. According to the method for culturing the Stichopus japonicus seed disclosed by the invention, the culturing process is easy to operate, the Stichopus japonicus seed is scientifically selected and fished and caught in advance; the Stichopus japonicus seed can be matured in advance and lay eggs by utilizing the method of indoor heating and accelerating, thus, large-scale seeds can be cultured in the same year, and the produced Stichopus japonicus seed has enhanced hereditary capacity, strong resistance and good property; moreover, as the feed of the Stichopus japonicus seed and the water temperature and the water quality in the Stichopus japonicus culturing pond are strictly controlled, the fecundity of the Stichopus japonicus is better than that of the Stichopus japonicus cultured in the pond and the intertidal zone, thus, the laid eggs have good quality and the distortion ratio at each stage is high.

The invention discloses a preparation method of a Crassostrea hongkongensis fixation medium. The preparation method comprises the following steps that (1) a plurality of rectangular plastic sheets are made and a round hole with the radius being 3-5 mm is formed in each plastic sheet, wherein the length of the plastic sheets is 10-20 cm, the width of the plastic sheets is 2-5 cm and the thickness of the plastic sheets is 1-3 cm; (2) the plastic sheets are strung through a rope, a plastic tube is arranged between every two adjacent plastic sheets, the plastic tubes are arranged on the rope in a sleeved mode, and then the preparation process of the Crassostrea hongkongensis fixation medium is completed. The invention further discloses the Crassostrea hongkongensis fixation medium and an application method of the Crassostrea hongkongensis fixation medium. After being processed through oxalic acid, fresh water and the like, the Crassostrea hongkongensis fixation medium is used as an eyespot larva collection fixation medium; the Crassostrea hongkongensis fixation medium increases the metamorphosis rate of Crassostrea hongkongensis larvas, accelerates juvenile mollusk growth, improves the juvenile mollusk survival ability and increases the juvenile mollusk yield, has the advantages of being capable of being recycled multiple times, light, convenient to use, good in corrosion resistance and the like and is worthy of popularization and application.

The invention relates to a litopenaeus vannamei parent prawn feed capable of replacing a fresh and living bait, and belongs to the field of nutrients and feeds of aquatic animals. The feed comprises the following ingredients in percentage by weight: 40% of fish meal, 6% of casein, 10% of krill meal, 15% of mussel meal, 14.75% of high-gluten flour, 0.5% of cholesterol, 2% of phospholipid, 7% of fish oil, 1% of choline, 0.5% of astaxanthin, 0.75% of vitamin C, 1.5% of calcium hydrogen phosphate, 0.5% of complex vitamins, and 0.5% of composite mineral substances. According to the litopenaeus vannamei parent prawn feed disclosed by the invention, through a compounding ratio of various nutrient components and through selection of raw materials, a prepared compound feed can meet nutritional requirements of parent prawns for reproduction, and feeding effects in respects of an egg laying rate, a continuous egg laying rate, a hatching rate, a distortion rate, egg diameters and the like of the parent prawns fed with the litopenaeus vannamei parent prawn feed are not significantly different from those fed with fresh and living clamworms, so that the feed disclosed by the invention can replace the fresh and living bait for strengthening the nutrients of the parent prawns, and the problem that the parent prawns are infected with external disease sources when being fed with the fresh and living bait is solved.

The invention belongs to the field of aquaculture, and particularly relates to a cultivation method of quasipaa spinosa tadpole metamorphosis larvae. The method comprises a tadpole cultivation pool, ambient conditions, stocking of small tadpoles, a culture method and a method for promoting metamorphosis. The illumination intensity suitable for a tadpole breeding stage, the illumination intensity suitable for a tadpole metamorphosis stage and the illumination intensity for controlling the metamorphosis speed are optimized, so that according to the growth stage and the metamorphosis stage of tadpoles, characteristic nutrition is optimized, and a water quality control method of combination of quicklime water and slow flowing water is optimized; for the tadpoles which are hatched in spring, conditions of illumination, water temperature, nutrition and the like are optimized, so as to shorten the growing period of the tadpoles; for the tadpoles which are hatched in autumn, corresponding conditions of illumination, water temperature, nutrition and the like are also optimized, so as to extend the growing period of the tadpoles; the growing development and metamorphosis development of the tadpoles are promoted, and diseases can be prevented, thereby increasing the survival rate and metamorphosis rate of the tadpoles.

The invention discloses a Chlamys nobilis offspring seed cultivation method. Offspring seeds are pretreated by water and are performed with parent Chlamys nobilis selection, induction for oviposition and artificial insemination to cultivate Chlamys nobilis offspring seed larva. The invention adjusts water quality by processing water for the offspring seed before inputting larva, thus effectively improving larva survival rate and distortion ratio, and lowering production cost.

The invention provides a special compound feed for breeding parent prawns of penaeus monodon. The feed comprises the following components in percentage by weight: 25%-40% of fish meal, 5%-9.5% of artemia powder, 3%-6% of enzymolysis fish soluble pulp powder, 3%-9% of schizochytrium limacinum powder, 1%-3% of kelp powder, 2%-8% of hermetia illucens powder, 2%-5% of shrimp shell powder, 6%-12% of mussel powder, 2%-5% of marine red yeast dry powder, 10%-15% of flour, 1.5%-3% of lysolecithin, 0.8%-1.4% of ARA purified oil, 1.5% of DHA purified oil, 1.5% of EPA purified oil, 3.1%-3.7% of stearic acid triglyceride, 1%-2% of fish oil, 1%-5% of monocalcium phosphate, 0.9%-1.22% of vitamin premix and 1.08%-1.4% of mineral premix. According to the special compound feed, the growth performance of the parent prawns of penaeus monodon in the breeding period is remarkably improved, gonad development of the penaeus monodon is promoted, and the egg laying amount, the egg laying rate, the continuous egg laying rate, the fertilized egg hatching rate, the metamorphosis rate and the egg diameter of the parent prawns are increased.

The invention provides a cultivation method of panulirus stimpsoni larva, which comprises the steps of: A. cultivating the hatched panulirus stimpsoni by a first bait for 13-17 days, wherein the first bait comprises at least one of the artemia nauplii, the scallop fertilized eggs, the oyster fertilized eggs and the planktonic copepodid larva; B. cultivating the panulirus stimpsoni by a second bait for 8-12 days, wherein the second bait comprises the first bait of the step A and the copepodid adult; and C. continuously cultivating the panulirus stimpsoni larva till that the panulirus stimpsoni larva is completely mutated into thelarva, wherein the bait comprises a third bait, and the third bait comprises the mural copepodid adult. The cultivation method of the panulirus stimpsoni larva can cultivate the panulirus stimpsoni larva in bulk, and is high in survival rate, high in mutation rate, and high in growth speed.

The invention provides a healthy aquatic microcapsule biological feed which is prepared by biochemically-treated raw materials, namely, composite high protein power, algae single-cell extractive, microbial protein yeast, detoxification and fermentation potato powder, a micro-ecology nutrient solution and a food calling coating agent by a curing material production device, a micro-ecology nutrient solution emulsifying mixing pelletizing device and a coating layer coating microcapsule production device. The quality of the feed can be improved, the production cost can be reduced, and the safety probability of the food can be improved since the chemical antibiotics additive is replaced by the biological product; the nutrition ingredients of the raw materials of the feed can be protected due to a microcapsule synthesis production technology; the gustatory difficulty of seedling feeding can be solved due to the food calling coating agent; and the feed is persistent in water due to the microcapsule, so that the pollution of the feed residue to the water quality can be reduced.

A metamorphosis inductor based on organic substances for the larvae of dual-shell shellfish is prepared from KCl (5.0-1000 g/m3, L-tyrosine (0.01-3 g/m3 and VB12 (0.01-0.5 mg/m3 through proportionally mixing. Its advantage is high metamorphosis percentage increased by 20-40%.

The invention discloses a method for increasing the metamorphosis adhesion rate of eyespot larvae of pinctada martensi and belongs to the technical field of aquaculture. The method comprises the basicsteps of preparation of an adhesion water pond for the eyespot larvae of pinctada martensi, collection of the eyespot larvae, medicine feeding and young pinctada martensi breeding management; in theprocess of breeding young pinctada martensi, the eyespot larvae without metamorphosis adhesion in a young pinctada martensi breeding pond are collected and moved to a young pinctada martensi breedingpond with fully hung young pinctada martensi collection instruments for cultivation, antibiotics and vitamins are used for improving ingestion and digestion of the eyespot larvae, and the metamorphosis adhesion rate of the eyespot larvae of pinctada martensi is increased. By adopting the method, large-scale manual young pinctada martensi breeding of pinctada martensi is conducted, the metamorphosis adhesion rate of the larvae is high, the individual size of young pinctada martensi is even, the young pinctada martensi breeding yield of pinctada martensi can be increased, and the economic benefit of pinctada martensi can be improved; the method is suitable for large-scale manual young pinctada martensi breeding of pinctada martensi, easy to apply and popularize and obvious in social benefitand economic benefit.

The invention discloses a method for cultivating burying habitat type shellfish larvae. The method comprises the following steps of after shellfish grows to D-shaped larvae, washing young shellfishesinto a cultivation basket, not adding a substrate into the cultivation basket, ensuring that the pond distribution density in the cultivation basket is 10ind/ml, and adhering a 300-mesh bolting silk net to the inner surface of the cultivation basket; putting the cultivation basket into a cultivation water body for cultivation, feeding bait organisms into the cultivation basket at regular time, andmaintaining the concentration of the bait organisms at 5*10<5>ind/ml; introducing oxygen into the cultivation water body to keep the cultivation water body rich in oxygen; and performing regular young shellfish washing and water changing. Compared with the prior art, the method has the following advantages that 1, the cultivation basket is arranged in the cultivation water body, the cultivation environment is improved, and the young shellfish growth speed and survival rate are increased; 2, the substrate does not need to be added, seawater permeates through the 300-mesh bolting-silk net, andthe influence of zooplankton on young shellfishes is reduced; and 3, the young shellfishes are basically not damaged by washing the young shellfishes and changing water, and the labor cost is greatlyreduced.

The invention provides a low-salt-tolerant molecular marker C62 for portunus trituberculatus and application of the low-salt-tolerant molecular marker C62. A nucleotide sequence of the molecular marker C62 is as shown in SEQ ID No.1, and nucleotide sequences of a primer pair for detecting the molecular marker C62 are as shown in SEQ ID No.2 and SEQ ID No.3. The molecular marker C62 is an SNP marker, and the low-salt tolerance genotype of the molecular marker C62 is an AG genotype. The molecular marker C62 provided by the invention is not limited by the growth stage of the portunus trituberculatus, is used for accelerating the breeding process of the portunus trituberculatus and quickly breeding crab species with excellent low-salt resistance, and is beneficial to healthy breeding and sustainable development of the portunus trituberculatus, so that the molecular marker C62 has a wide application prospect.

The invention discloses an artificial cultivation method of red-stripe lysmata vittata larvae. The artificial cultivation method comprises following steps: collection of larvae; density and environmental requirements of larva cultivation; recirculating aquaculture prior to larval metamorphosis and cultivation of larvae. The artificial cultivation method of red-stripe lysmata vittata larvae has following beneficial effects: artificial cultivation is achieved for the first time by adoption of artificial cultivation technology so that survival rate and metamorphosis rate of zoea are greatly increased; and all of these provide quantity and quality assurance for red-stripe lysmata vittata in an aquatic market .

The invention relates to a breeding method capable of controlling the aberration rate and the body color abnormity of verasper variegatus seedlings and belongs to the field of aquatic seedling culture. The method comprises the following steps of: feeding reinforced rotifer to fish larvae of verasper variegatus, which are at the age of 5 to 6 days; when the verasper variegatus grows to the age of 19 to 21 days, simultaneously feeding artemia nauplii and reducing the feeding quantity of the rotifer until the verasper variegatus grows to the age of 34 to 36 days; and then starting to completely feed the artemia nauplii, wherein the artemia nauplii is reinforced by schizochytrium limacinum and the rotifer is reinforced by se-yeast after being reinforced by the schizochytrium limacinum. According to the invention, the Se-yeast is used as a reinforcer of the rotifer; content of selenium in a bait is improved; the fish larvae of verasper variegatus can be promoted to grow; the metamosphsis rate of the fish larvae of verasper variegatus is promoted; the aberration rate and the ratio of the body color abnormity are effectively reduced; survival rate is high; and the seedlings have high quality.