How to raise crabs
In recent years, with the rapid development of the aquaculture industry, crab farming has become a popular choice for many farmers and investors. Whether it is hairy crabs, swimming crabs or blue crabs, scientific breeding methods can significantly improve the yield and quality. This article will combine the hot topics and hot content on the Internet in the past 10 days to introduce you to the key points of crab farming in detail.
1. Basic conditions for crab farming
Crab farming needs to meet certain environmental conditions. The following are the key factors:
| Conditions | request |
|---|---|
| water quality | pH value 7.5-8.5, dissolved oxygen ≥5mg/L, ammonia nitrogen ≤0.2mg/L |
| water temperature | Suitable temperature is 20-30℃, optimal growth temperature is 25-28℃ |
| substrate | A sandy mud bottom is preferred, and the thickness of the mud should not exceed 15cm. |
| Breeding density | Stocking amount per mu: 2000-3000 crabs, 800-1200 adult crabs |
2. Key technologies for crab farming
1.Seedling selection
Choosing healthy, vigorous seedlings is the first step to success. High-quality crab seedlings should have the following characteristics: intact limbs, smooth body surface, and responsiveness.
2.feed management
| growth stage | Feed type | Feeding amount | Feeding frequency |
|---|---|---|---|
| Young crab stage | Mainly animal feed (surimi, earthworms, etc.) | 8-10% of body weight | 2-3 times a day |
| middle stage | Animal and plant feed mixture (fish meal + soybean meal) | 5-8% of body weight | 1-2 times a day |
| fattening period | High protein feed (small fish, snails, etc.) | 3-5% of body weight | 1 time a day |
3.water quality management
Regularly test water quality indicators to keep water bodies clean. It is recommended to change 1/3 of the water every 7-10 days and use micro-ecological agents to adjust the water quality.
4.Disease prevention and treatment
| common diseases | Symptoms | Prevention and control methods |
|---|---|---|
| Gill rot | Gill filaments are swollen and rotten | 0.3ppm chlorine dioxide spilled throughout the pool |
| carapace ulcer | Dark brown spots appear on the carapace | Soak in 5% salt water for 10 minutes |
| Ciliosis | There are gray and white hairs on the body surface | 0.7ppm copper sulfate solution medicinal bath |
3. Frequently Asked Questions about Crab Breeding
1.Why do crabs kill each other?
Crabs are territorial and can easily kill each other when the density is too high, there is insufficient feed, or there are large individual differences. The solution is to reasonably control density, feed evenly, and set up shelters.
2.How to improve the survival rate of crabs?
Key points include: selecting high-quality seedlings, scientific feeding, regular disinfection, and graded feeding. Data shows that using standardized breeding technology can increase the survival rate from 60% to more than 85%.
3.When is the best season for crab farming?
The best breeding period for most crab species is April to October. It can be shortened appropriately in the northern region and extended to November in the southern region.
4. Market Prospects of Crab Breeding
According to the latest market research data:
| Variety | Market price (yuan/jin) | annual growth rate |
|---|---|---|
| hairy crab | 80-150 | 12% |
| swimming crab | 60-120 | 8% |
| blue crab | 90-180 | 15% |
With consumption upgrading and the expansion of e-commerce channels, high-quality crab products are in short supply. Adopting an ecological breeding model to create branded products can achieve higher returns.
5. Summary
Successful crab farming requires mastering scientific farming techniques and paying attention to key aspects such as water quality management, feed feeding, and disease prevention. At the same time, we must pay close attention to market dynamics and choose marketable varieties. As long as you do it right, crab farming is indeed a good way to get rich.
I hope this article will be helpful to your crab farming career. For more details, it is recommended to consult the local aquatic technology promotion station or participate in professional training.
check the details
check the details
en
