New techniques for breeding Red Silkworm, Bombyx mori

The red sand silkworm may not know much about it, and it is indeed relatively rare in life, but the red sand silkworm is very rich in nutrition and rich in protein, which is the best bait for fish, shrimp, crab and so on. Let's get to know it with the editor.

New techniques for breeding Red Silkworm, Bombyx mori

The red sand silkworm is rich in nutrition, rich in protein, amino acid and eicosapentaenoic acid, and is the best fresh and high quality food for fish, shrimp, crab and so on. In taxonomy, Bombyx mori belongs to annelid phylum, Polychaeta, wandering order, Bombyx mori family, commonly known as sea worms, sea maggots, sea centipedes, sea leeches. There are more than 80 species of Bombyx mori in China, and the main economic species and varieties used for breeding are: Bombyx mori, Bombyx mori, Bombyx mori and so on. The larvae feed on plankton and adults feed on humus, which likes to live in the sand and mud of coastal shoals and intertidal zones with fresh water inflows. Bombyx mori has high nutritional value and is widely used in aquaculture.

Source of parents of Bombyx mori

There are two sources of parents for the breeding and production of Bombyx mori: one is the collection of sexually mature Bombyx mori from the seaside and salt fields during the breeding season, and the other is the artificial intensive culture of the silkworm which is about to become the body of Bombyx mori.

Artificial breeding and breeding methods

First, parent insect cultivation. Thirty days before the breeding festival, the quasi-parents of Bombyx mori with intact, robust and responsive individuals were selected for intensive cultivation. Chrysophyta, Saccharomyces cerevisiae, Saccharomyces cerevisiae and compound feed were fed 3 times 4 times a day, unicellular algae 150000 ~ 200000 cells / liter and compound feed 30g / m 2 per day. The water temperature is 23 ~ 25 °C and the salinity is 28 ~ 30.

Second, artificial reproduction. The breeding period of Bombyx mori is usually from January to March in spring and from August to November in autumn. When the parent gland is mature, the heterotypic silkworm body (heteromorphism) with bright color, no mechanical injury, strong vitality and full gonad is selected and put into the spawning cage in the flume according to the ratio of male and female (7: 8): 1, and appropriate amount of sterilized seawater is added to induce spawning and ovulation. After the production is finished, remove the parent and spawning cage and wash the eggs with sea water several times to remove the excess semen.

Third, the hatching of fertilized eggs. The hatching density was controlled at 10 ~ 20 / ml, TA and antibiotics were 2 mg / L on E days, the water temperature was 23 ~ 25 °C, the pH value was 7.8 ~ 8.6, the salinity was 25 ~ 28, and the aeration rate was kept at more than 1.5% of the total water body per minute. In the process of hatching, the water quality should be strictly controlled to avoid being invaded by protozoa; at the same time, attention should be paid to stirring the bottom frequently to avoid the sinking of fertilized eggs, resulting in anoxic death. After coming out of the membrane, the larvae were collected with 350-mesh silk mesh and cultured in the pool.

Larval rearing of Bombyx mori

The main results are as follows: 1. The three-node defective foot larvae can be hatched in about 2 days under the condition of water temperature 22-24 ℃. The newly hatched larvae are nourished by yolk oil balls and do not need bait. The yolk oil ball disappeared after 2 days, and the bait should be given in time. The bait is mainly unicellular algae such as marine yeast, Chrysophyta, Dunaliella Salina, Platymonas, Mini-diatom and so on. Three times a day, marine Rhodotorula was fed with 0.5mg / L of Rhodotorula and 100000 ~ 200000 cells / L of unicellular algae. After arriving at the Wukang defective foot larva, you can appropriately add technology-fed Chrysophyta powder, small diatom powder and spirulina powder 0.5 × 1.0 mg / L; keep the water temperature 22 ~ 25 °C, salinity 28 °30, pH 8.0 °8.6, light 1000 × 3000 lux; in the plankton stage, you need to change water twice a day, 50% each time, once in the morning and evening, and the water exchange mesh is gradually reduced from 300 mesh to 100 mesh. At the same time, photosynthetic bacteria, liperu, libium, etc., were released to regulate the water quality. When the larva develops to the five-node defective foot larva, it should be inverted into the pool and put into the larval culture pool to continue to cultivate.

Second, the larva cultivation pond needs to lay fine sand with a diameter of 5mm and 10mm, and the sand bed thickness is 5cm and 7cm. The larvae of the larval stage were put into the pond with a stocking density of 200000 ~ 300000 tails / m ~ 2. The water should be changed 5 times a day, and the water should be discharged for 30 minutes after flooding the sand bed. When changing water, the bait is 80% diatom powder and chrysophyte powder + 20% powder, the daily feeding amount is 3 × 5 g / m ², based on the principle of a small number of meals. After 30-45 days of cultivation, the young Bombyx mori can grow to 2cm in body length, that is, more than 11 nodes, and can be cultured in ponds at this time.

Adult culture of red silkworm, Bombyx mori

During the adult culture period, the sand bed is 12 cm thick and the particle size is 0.5 cm 1.0 cm, the stocking density is 8000cm 12000 strips / m ², the culture water temperature is 630cm and the salinity is 2030cm. Change the water three times a day and stay for 30 minutes after submerging the sand bed. When entering the water, the bait is 70% powder, 10% diatom powder and gold algae powder, the feeding requirements are uniform, the daily feeding amount is 3%-5% of the body weight of sand silkworms, and the amount of residual bait on the surface of the sand bed increases or decreases as appropriate. During the culture period, the sand bed should be washed according to the bottom of the sand bed and some water quality improvers should be properly applied to keep the culture environment clean and improve the survival rate of culture. The larvae of 2cm and 3cm can reach the commercial specification of 10cm and 12cm after being cultured for 5 months.

In any aquaculture, in fact, it is very necessary to master its aquaculture technology. Only by mastering its aquaculture technology, can we avoid detours in the process of aquaculture and avoid unnecessary risks.