1, artificial nursery

In the salinity of 28-30 conditions, fertilized eggs in the water temperature of 11, 13, 16 ℃ to develop to the D-shaped larvae time required for 83, 60 and 46h; in the water temperature of 16-18 ℃, after 20 days to develop to the top of the shell shell larvae shell length of about 380 μm appeared foot and the water pipe protoplasmic base, into the attachment of metamorphosis stage.

After being placed in the attachment base and incubated for about 70 days, the larvae could grow to a shell length of 5mm. The daily growth rate of shell length was 6.2 μm in the D-shaped larval stage and 16.8 μm in the shell-top larval stage. The growth rate accelerated after the attachment metamorphosis, and the shape took on the form of an adult.

The seedling collection rates of different attachment bases were in the following order: fine sand > pebbles > polyethylene mesh > corrugated board.

2, water temperature and salinity

Elephant-braided mussels are buried shellfish, living in the sea area of the water temperature of 3 ℃ -23 ℃, after 3 years of domestication, can adapt to the water temperature of 0 ℃ -25 ℃, salinity 27 ‰ -32 ‰, habitat substrate to sandy mud is mainly deep 3m -18m, buried depth and the size of the individual.

Elephant-braided mussel seedling in the shell length 5cm-10cm when the ability to dive sand is very strong, generally submerged in only 5 minutes; shell length 15cm or more that is the loss of creeping and dive sand ability, lifelong burrowing life, no longer move.

Elephant-braided mussel breeding sea area should be selected in the smooth water flow, wind and waves are small, rich in bait, sandy substrate of the inner bay, aquaculture water depth from the low tide line to 10m can be. In winter, the seabed water temperature is not less than 0 ℃, not higher than 25 ℃ in summer.

3, substrate selection

Elephant-braided mussels attached to the base of sand is good, attached to the use of running water method of cultivation of juvenile shells, the daily amount of bait gradually increased to 60,000 cells / ml-120,000 cells / ml, the larvae of 8 days -10 days to develop into a single-tube stage of the juvenile shells (shell length of 0.6mm - 1mm).

22 days -23 days development into double tube stage juvenile shell (shell length 1.4mm-1.6mm); 30 days after the shell length of 2mm (1500 -800); 40 days shell length of 3.5mm (150 -180); 60 days shell length of 8mm (20 -26), then you can go to the sea to sow seedlings.

Expanded Information:

I. Habitat

Elephant-braided mussels are buried shellfish, living in the sea area of the water temperature of 3-23 ° C. After 3 years of domestication by artificial cultivation, it can be adapted to water temperatures 0-25 ° C. The water temperature of the mussels is 0-25 ° C. The mussels have been used in the sea area for many years, but they are not used in the sea area.

When the water temperature is lower than 25 ℃, Guangdong can be in the winter and the following spring for the opposite season breeding, salinity of 27 ‰ -32 ‰, habitat substrate to sand and mud-based, water depth of 3-18 meters, the depth of buried with the size of the individual, generally 50-80 cm.

Elephant-drawn mussel seedlings in the shell length 5-10 cm when the ability to dive into the sand is very strong, generally dive into only 5 minutes; shell length of 15 cm or more that is the loss of creeping and dive sand ability, life-long camp cave life, no longer moving, with a large individual, fast-growing, tasty, economic value and high advantages.

Two, reproduction

Elephant-braided mussel dioecious, the annual breeding season is generally in April-July, the peak period of May-June. Individual spawning volume of 10-20 million, spawning water temperature of 14-17 ℃.

The diameter of the egg is 82 microns, and the fertilized egg develops into a D-shaped larva (120-130 microns) after 4-5 days; it develops into a shell-topped larva (160-180 microns) in 10-12 days; and the larva sinks in about 30 days, and with the metamorphosis, the shell reaches 350-400 microns in length.

The first 4 years of the weevil mussel grows faster, the 1st age shell is 5-6 cm long, weighing 36-40 grams; the 2nd age shell is 8-10 cm long, weighing 200-250 grams; the 3rd age shell is 10-12 cm long, weighing 400-500 grams.

4-year-old shells are 12-15 cm long and weigh 500-800 grams. With age, shell growth slows down, but soft body growth can continue, life expectancy can be more than 100 years.

References:

Baidu Encyclopedia-Elephantine