1. The sea areas, equipment breeding sea areas and breeding equipment are all the same as the original culture methods.
2. One of the key factors for seasonal breeding of seedling scallops is the purchase of large-sized seedlings. There are two types of large-size scallop seedlings. One is to raise the old man's seedlings for the winter and cross-summer. This kind of seedling has a high mortality rate due to summer weather and cannot be batch-formed. The second is the purchase of large-scale seedlings that were bred in that year. The breeding unit and the seedling supply unit should contact each other in close cooperation. The seedling production unit should timely filter the seedlings of the larger size seedlings into the holding cage when the water temperature is appropriate. It is advisable to use about 2000 grains per cage.
3. The sooner or later time for transporting seedlings of seedlings is another key factor in the seasonal breeding of scallops. The water temperature in Rizhao sea area is generally higher than that of Yantai seedlings at 2°C-3°C. Therefore, timely transportation in advance can effectively promote the growth of scallop seedlings. The seeds of the same specifications were transported back in winter and grew faster in winter than in the seedlings in Yantai. In the spring of the same year, the seed of the same specification could grow 1 tm more than the seedlings in Yantai. The time for transporting seedlings can generally be advanced to mid-to-late October and night transport after cold air is selected.
4. Sub-miao seedlings can be divided into seedlings for about half a month after purchase, and starfish, sea snails and other predator organisms and impurities can be removed. Seeds of seedlings larger than 1.5 cm can be sieved out to form cages, and external coat nets can be used. When strict control of the number of seedlings, preferably 40 tablets per layer.
5, the management of daily management is mainly to adjust the buoyancy anti-collapse rack, the spring of the second year when the water temperature rises above 5 °C, according to the situation of growing cage attached impurities timely tearing off the jacket network.
6, the harvest according to the size of the aquaculture to determine the harvest time, generally need to be completed before July 10th, harvest scallops specifications up to 5-6cm, cage production 6-8kg.
In recent years, shallow-seamed clam scallops in Donghai District, Rizhao City, Shandong province have experienced large-scale deaths for several years. The mortality rate is as high as 90%, and some sea areas are even out of production. In view of this situation, we have timely adjusted the culture structure and promoted the seasonal breeding of the scallop scallop, which is to change the traditional breeding mode of “Spring and Autumn Harvest†to “spring harvest in autumn†to avoid the summer high temperature death period and the typhoon period. Effectively stop the landslide phenomenon of shallow-sea boring scallops and achieved good economic benefits. The practice of seasonal cultivating scallops in our district is described as follows: