One, the selection of farm conditions

The farm of adult clams, should choose the wind and waves are relatively calm, the tide is smooth, the terrain is flat, more sand and less mud (sand content of 70% to 90%) of the low tide area; seawater specific gravity of 1.010 ~ l.025, the most ideal specific gravity of 1.012 ~ 1.020; current speed of 40 to 100 centimeters per second.

Two, the whole Cheng sowing seedlings

1, sowing season:

Sowing season, according to the individual specification of the seedling size, and there is a big difference. The first is that the first time a person is in the market for a new product, the second is that the first time a person is in the market for a new product, the third is that the first time a person is in the market for a new product.

2, the whole Cheng:

The whole Cheng work, mainly in the Cheng land near the harbor channel and the edge of the subtidal zone, with the mango grass dike, in order to prevent the loss of clam seedlings. The dike is 30 to 40 centimeters wide and 25 centimeters high. A large portion of the mudflat should also be surrounded by grass, separated into several pieces, easy to manage. The first thing you need to do is to pick up the stones and debris on the surface of the court, fill in the depression with sand, and level the surface of the court. If the ground is soft, it is necessary to dig a drainage ditch to prevent water on the ground. Finally, a week before sowing seedlings, with bleach (15 kg / mu) or tea seed cake (8 kg / mu) splashed Chengdu, kill the enemy organisms.

3, seedling sowing method:

Sowing method has dry sowing and wet sowing two kinds.

(1) Dry sowing: When the Chengdu land is dry and dewy after the tide goes out, unload the clam seedling from the seedling ship moored on the Chengdu land. When sowing seedlings, the requirement to sow evenly, to prevent piles of agglomeration. If the tide has risen and can not continue to sow seedlings or sow seedlings are not completed, then the clam seedlings should be unloaded, submerged in water, to be the next tide and then sow.

White seedlings because of a small body light, easy to be taken away by the tide and loss, so more choose this method of seedling sowing.

(2) wet sowing: wet sowing is in the tide is not out of the Cheng surface, with the boat to the clam seedling to insert a good sign of Cheng, in the sign of the scope of the amount of sowing evenly. The first thing you need to do is to make sure that you have a good understanding of what you are doing and what you can do to make sure that you have a good understanding of what you are doing.

With the wet sowing method, it increases the sowing time, improves the labor efficiency and the survival rate of the clam seedlings, but the sowing is not uniform. This method is only applicable to medium and large seedling sowing.

4, seeding density:

Sowing density, directly affecting the growth rate and yield of clams. If the seedling density is too large, the clam grows slower; if the seedling density is too sparse, can not make full use of the raised area, lower yields. Therefore, it is necessary to grasp the appropriate seedling density. The amount of seedling sowing, according to the size of the individual clam, the height of the tidal zone and substrate conditions and other factors to decide (Table 19-6): the individual clam seedling, high survival rate, can be less sowing; tidal zone low, the clam seedling feeding time is long, fast-growing, but also more hostile, clam seedling victimization rate is high, it should be appropriate to sowing more; the bottom of the hard Chengdu, good stability, can also be more sowing.

In addition, according to the sea area of bait organisms and the size of the flow and discretionary increase or decrease.

Three, the management

As the saying goes, "three parts of the seedling, seven parts of the management". Do a good job of management during the development, is to ensure that the important measures to improve the yield.

1, transplantation:

The main purpose of transplantation is to transfer the breeding tide area, evacuate the breeding density, and promote growth.

(1) seedling increase, sparse colonization: seedling seeding of the tidal zone is higher, after 6 to 7 months of breeding, the individual significantly larger, increased intake, the breeding density is relatively too dense; at the same time, the clam's physique is gradually strengthened, the ability to adapt to the external environment is stronger. Therefore, should be moved to the lower tide area stocking, and appropriately reduce the breeding density, in order to accelerate the growth of clams.

(2) with different seasons transplantation, in order to improve the survival rate of the clam seedling: according to the mud layer of good insulation, winter is not easy to freeze the clam seedling and the sand Cheng water storage, low temperature, summer is not easy to die of clam seedling sun characteristics. With the different seasons, can be transplanted to different sites to improve the survival rate. It can be carried out by the method of harvesting and transplanting at the same time.

(3)Accelerate the recovery of post-partum pro-clams, transplantation to promote growth: pro-shellfish after spawning and insemination, due to the weakness of the body, poor adaptability to environmental factors, easy to cause death. Therefore, it should be transplanted to a site with low tidal area, rich bait and calm wind and waves for breeding before the breeding season to recover the body condition and accelerate the growth rate.

2, prevent disaster and enemy:

Natural disasters that seriously threaten clams are mainly floods and typhoons. In vulnerable to typhoons Chengdu, should strive before the typhoon season, harvesting or transplantation to a safe area; flood threatened Chengdu, should also take similar measures; not in time to harvest and transplantation and the victim, must be rescued in time to clear the mud and sand covering the surface of the Chengdu, set scattered clams, in order to minimize the loss.

The enemy organisms of clams and their control measures are as mentioned before. During the period of cultivation should often go down to the court to get rid of pests to reduce losses.

3, strengthen the daily management:

After the clam seedling is played, it is necessary to frequently patrol the town to check whether there is any loss of the clam seedling, the growth rate of the clam and the survival rate, and the damage caused by the enemy pests in order to replenish the seedling in a timely manner or to take corresponding measures. At the same time, to dredge the ditch, fill the surface, repair the dam. Especially just after the breeding of the parent clams, weak, most of the floating on the surface of the court, if the artificial trampling, the mortality rate is greater. Therefore, after the breeding season, it is more important to strengthen the management or migration.