CATDOLL : CATDOLL: Technical requirements for bacteria-free sedimentation of oyster seedling seawater

Technical requirements for bacteria-free sedimentation of seawater for oyster seedlings

1. You need to prepare the attachment tools first, tie the one-meter-long bamboo poles into a bundle, insert them into the intertidal zone, wait for the barnacles to attach, and keep their shell base after removing them.

2. When the oysters are spawning, insert the bamboo poles to collect the fry. After the larvae have attached and grown, they can be scattered in the low tide area and wait for them to grow slowly.

When are oysters at their fattest? In which month are oysters at their fattest?

1. Oysters are at their plumpest from December to the Qingming Festival of the following year, but they are available from November to May of the following year. Because oysters are usually stocked from May and can be harvested after about 6 months of breeding, they can be eaten in November. However, after December, the weather starts to get cold, oysters consume less energy and accumulate more energy, so the meat of oysters is relatively plump and will last until the Qingming Festival of the following year.

2. Oysters are oysters, and their seedlings come from semi-artificial seedling collection. Oysters can reach mature gonads and reproduce when they are one year old. When the gonads of oysters are mature and the water temperature is 24-25℃, it is the peak period for oyster spawning. The peak period for oyster reproduction in the Xinghua Bay area of ​​Putian is from May to June, and oyster spawning is mostly carried out during high tides. The temperature in the sea area is suitable, and the fertilized eggs of oysters develop into D-shaped larvae after 20-22 hours. The average shell length of the larvae reaches more than 280μm. When the larvae have eye spots of 40% to 50%, the attachment base can be released to allow the larvae to metamorphose and attach. Based on years of experience, Xiuyu District aquatic technicians test oyster seedlings in the sea area. Once the oyster seedlings are mature, they are sent through the platform to guide farmers to release the attachment base in a timely manner.

3. Generally, the seedlings can be collected locally, and oyster shells can be used as seedling collectors, which is low in cost. According to the experience of seedling collection over the years, oyster seedlings are very active and numerous from May to mid-June every year. Check the effect of seedling collection and go to the sea frequently to check during the seedling collection period. Oyster seedlings as big as a pinhole can be seen 3 to 5 days after the seedlings are attached. If barnacle seedlings are attached, they should be cleaned in time and the seedlings should be collected again. Don't miss the seedling collection season.

4. Raft-cultured oyster seedlings must be temporarily kept in the harbor for more than a month, and the oyster seedlings are not easy to fall off before they can be divided and put into the sea for cultivation. 4 to 5 days before the seedlings are divided, several points should be set in the raft culture area, and a few strings should be taken for trial cultivation to determine whether the oyster seedlings can adapt, as well as the attachment of harmful organisms in the sea area, especially the attachment of barnacles; if there are many barnacles attached, put them off for the time being. The cultivation cycle from seedling collection to harvest is about 10 months. During the oyster cultivation period, the focus is on management, including artificial control of the breeding density, adjusting the water layer through the float, and hanging the oyster seedlings about 3m underwater to adapt to the survival of the seedlings. As the juveniles gradually grow and the mass increases, the water layer is adjusted by the float in time; reinforcement is often carried out to prevent typhoon attacks. When a typhoon comes, reinforce the infrastructure in advance and tidy up in time after the typhoon. The load increases on the eve of the oyster harvest, and the buoyancy should be increased to prevent the raft from sinking.

5. Shallow sea raft culture of oysters is easy to harvest, greatly reducing labor and improving economic benefits. The demand for oyster consumption is growing steadily, and the market is active. The oyster cultivation period begins in the autumn when the water quality is fertile, and the oyster fatness reaches its peak after 1 to 2 months. According to market demand, oysters can be harvested when they reach commodity specifications.