Oysters are one of the seafood that bring a rich source of energy and nutrients. However, the number of oysters in the wild is not enough to supply the market. Artificial oyster farming models have appeared to address the needs of the market. Oyster farming techniques will be more complete when more know-how from experts. The content of today’s article will help you have a more specific view on this topic.
Subjects and scope of application
Objects: Applying estuarine oyster farming by rafts.
Scope of application: Applied in farming areas with approved aquaculture planning and suitable with biological characteristics of estuary oysters (with naturally distributed estuary oysters).
Location and preparation of farming works
Choosing a farming area
- Located in the aquaculture area approved by the aquaculture planning or approved by the competent authority; does not affect waterway traffic.
- Not contaminated by wastes from residential areas, factories, industrial zones, etc.
- There is circulating flow, flow rate from 0.2 to 0.3m/s, rich phytoplankton composition.
Hanging on rafts is a popular farming method today. This form of farming Oysters has a fast growth rate, high survival rate, and is easy to manage, care for and harvest. The raft is square (9mx9m), many rafts are connected together into a large array.
Attachment: Oyster seed clings to the substrates (mollusk shells, cement…) which are perforated and hung on strings.
Bamboo rafters are linked by plastic strings; The use of wire increases toughness, withstands wind and has low repair costs.
Floating buoys are non-plastic containers or styrofoam… The number of buoys ensures that the raft stays on the water until the oysters are harvested.
The distance between the bamboos used to hang the Oyster rope is from 25 to 30 cm.
Choose varieties and stock them
Select and buy oyster seed from reputable seed production and trading establishments and have been inspected, evaluated and classified by state management agencies, reaching grade B or higher. (ii) Oyster seed is quarantined and quality checked according to the announcement of the production facility and the state’s regulations. (iii) Purchased varieties must have valid financial documents according to current regulations. (iv) Select breeds that are uniform in size, bright in color, free from deformities and diseases.
Refer to the recommendations of specialized agencies (Seasonal Calendar) and actual weather conditions to choose the appropriate time to stock. (ii) Usually stocking in March – April of the solar calendar and August – October of the calendar (sub-season) of the year.
A hanging rope has a length of 2 – 2.5m, the distance between each string is 20 – 25 cm, each rope is hung with 6-7 objects containing oyster seed. On each attachment, there are 4 or more seed oysters. Note: The length or short of the rope depends on the depth, current of the farming area and the load capacity of the raft.
Management and care of oysters
Periodically inspect and strengthen the raft system, especially before and during the rainy and stormy season. It is possible to lower the oyster line deeply to limit the influence of wind and waves. About 15-20 days to check the growth and development of Oysters as well as to clean the growing lines, remove clinging objects, algae, moss, silt, etc. During the rearing process, it is necessary to actively thin the oyster lines to ensure conditions. food for oysters to grow and develop.
Collect domestic waste and production waste in designated places. Monitor some key environmental factors such as pH, dissolved oxygen, salinity, alkalinity, etc. and periodically check the density of plankton (natural food source) to take technical measures. timely adjustment.
Apply integrated disease prevention and treatment measures to limit the occurrence of diseases: (i) Select and buy healthy seeds from reputable seed suppliers and have legal quarantine documents and certificates. (ii) Periodically clean the growing lines and farming areas; (iii) Actively clearing farmed oysters; (iv) Strictly comply with state regulations and guidance of specialized agencies.
Note: Keep a full diary, keep a log to facilitate traceability and inspection by state management agencies.
After 12-18 months of culture, it can be harvested. Harvest season is related to product quality. Usually in the breeding season, when the gonads of oysters are mature, the quality of the meat is the best. At this time, oyster meat has a high protein content and low water-weight content.
Before transporting to the point of consumption, it is necessary to clean the outside of Oysters to remove any clinging objects. Transport Oysters to the point of consumption in a cool, moist environment.
Above is the information related to oyster farming techniques that agrisearch.net would like to send to farmers for reference. Hopefully the information in the article will help you build a model of oyster farming to bring you the best profit.