As the saying goes: How much crab, see grass. This shows that the cultivation and protection of aquatic plants plays an important role in the success or failure of crab breeding. However, there must not be too much water in the crab ponds. Recently, some callbacks from the crabs have been reported to reflect excessive water and grass in crab ponds in the middle and late crabs of last year, resulting in deterioration of water quality. It is easy to cause soft shell crabs and tops hiding in aquatic weeds during artificial cutting. Shell crabs die, and when time is wasted, crabs are extremely inconvenient to catch. They asked if there were any good measures to control the excessive aquatic weeds in crab farming.
Causes of excessive aquatic weeds in crab ponds during the middle and later periods of crab culture mainly include the following: First, the crab owners are worried that the plants will not grow up and blindly increase the amount of aquatic weeds planted; second, the crab owners excessively care for aquatic plants, and the crabs could have eaten too much. Water plants, but the crabs are eager to care for the grass, plus a lot of concentrate feed, chilled fish, resulting in wild plants.
To prevent excessive water in the crab pool, first, the proper amount of grass, the second is the vigorous growth of aquatic plants season, less investment in fine feed, so that the river crab to eat part of the plants, and the third is the early discovery of aquaculture crazy long to castration. If there are too many weeds in crab ponds during the middle and later stages of crab breeding, in order to protect some of the shelled crabs and shelled crabs that have just been shelled, manual cutting methods should not be used. Biological methods can be used for control. In this regard, the Dagu Township Aquatic Technology Promotion Station in Dangtu County of Anhui Province made a useful attempt.
In 2004, the Dawei Township, Anhui Province, aquaculture technology promotion station in Dangtu County conducted a trial to control the growth of aquatic grasses in a 45-acre crab pond. The crab pool covered more than 90% of the grass coverage by the end of July. On August 5th, aquatic technicians stocked 30 kg of grass carp species in the pond, with a specification of 60-80 tails/kg, and at the same time they were stocked with 20 kg of summer carp.
On August 20th inspection, the coverage rate of crab grass plants dropped to 80%. On September 6th inspection, the coverage rate of crab grass plants dropped to 70%. By October 30, the coverage rate of crab pond water plants was only 30%. At the same time, an area of ​​the crab pond with the same area was used to remove aquatic weeds. By October 30th, the grass cover rate was still above 60%, which caused inconvenience to the crab fishing and the rate of return was very low. Of course, during the promotion of the technology, there was also a failure to raise the crab family. This was mainly due to the acute weediness. The size of the stocked grass carp was larger and the quantity was higher. In less than one month, a pond was grass grass. Eating out, raising crab ponds into fishponds, the result is not worth the candle.
Excessive water crab grass ponds stocking some of the grass species, not only can control the aquatic plants grow mad, but also can be part of the commercial fish harvest; while stocking some carp summer flower filter plankton, can purify water quality. It should be noted that the time, size, and quantity of grass carp should be well managed and the grass should not be eaten in a short period of time.
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