Five steps for fishing in the high temperature season

In the hot summer weather every year, it is also the peak season for some fish and shrimp. With the joy of harvesting, the problem of dead fish that occurred during fishing and transportation on the under net became a heart disease for farmers and fishmongers. Fish, pigs, ducks and fish ponds that are polyculture, and fish ponds that are on the path of disease are particularly serious. After the pond is caught in the net under the general pond, there will be cases of dead fish ranging from a few dozens of catties to one or two thousand catties. The fish transporter has not yet reached the fish wholesale market, and the fish began to appear red, scales, detackification, burning and other phenomena, and even a large number of dead fish appeared severely, selling poorly, reducing prices, and a large number of dead fish. Make fish traders often lose money. In 2009, a large number of dead fish had been caught in the nets of catching fish, resulting in a large number of dead fish, regardless of breed or size, which caused huge economic losses to farmers. In order to avoid more unnecessary losses, the introduction of a network before and after treatment methods, can effectively reduce the dead fish after the network and transport, poor sales, only for reference in the industry.

First, the traditional drawbacks of pulling the network

The traditional experience of pulling net fishing is to use a large dose of copper sulfate to forcibly shrink the scales of the fish body one day before the net is pulled, and the mucus is increased after the body is stimulated; when the fish is transported, salt, penicillin and other drugs are used to increase mucus or disinfect; Fish ponds after netting are splashed with disinfectants such as chlorine dioxide, povidone iodine and quicklime. Obviously, this method is not only inconsistent with the requirements for the withdrawal period for aquatic products without pollution, but the effect is not obvious and it is easy to kill fish and shrimp. The reasons for the death of fish and shrimp after netting are as follows:

1. After half a year of breeding, the residual bait and excrement in the pond have accumulated in a large amount, and the water quality conditions have deteriorated. A lot of harmful substances such as ammonia nitrogen, nitrite, and hydrogen sulfide accumulate at the bottom of the pond. With the hot weather, the net is pulled. It is stirred to release a large amount of harmful ammonia, nitrites, hydrogen sulfide, and other harmful substances. Fish and shrimp are prone to acute poisoning.

2. The liver burden of fish and shrimp is heavy at the later stage of culture. Fish and shrimp are in a sub-healthy state. Any minor problem can easily become a big problem.

3, pulling the net transport caused by the stress response of fish and shrimp, resulting in dead fish and dead shrimp.

4. During the breeding process, excessive antibiotics and disinfecting insecticides may be used to affect the mucus secretion of the fish itself.

Occasionally, farmers are afraid to control fish and shrimp because they are sick. In order to reduce losses, they want to sell fish and shrimp as soon as possible, but fish and shrimps that are sick cannot tolerate such torment. During the high temperature season, the deaths of squid, squid and squid are very common, and the stress response of shrimp is even more prominent.

Second, "pull net five steps"

The Fangcao Hang Seng Fisheries Technical Service Center has compiled a set of effective methods to prevent fish nets that have been killed or injured by pulling nets through three years of service experience in Guangdong. The “Five Steps to Pull Nets” has been applied to improve the environment and reduce stress before and after fishing. The fish and shrimp are widely used in Shunde and Nanhai, and are suitable for various farming species. The effect is very obvious.

The first step is to reduce or stop feeding the feed 2 days before hungry fishing. Excessive food intake increased the metabolism of fish and shrimp, increased fish requirements for dissolved oxygen, and environmental stress. Second, a large amount of feces evacuates contaminated transport water during transportation, increasing oxygen consumption.

The second step is to adjust the water quality adjustment before the netting, especially the improvement of the bottoms. A large number of harmful substances such as ammonia nitrogen, nitrites, and hydrogen sulfide are present in the bottom of the pond. Pulling fishing nets stirs the water body, causing harmful substances to spread throughout the entire pool, which can easily cause rapid deterioration of water quality, allowing fish and shrimp to be stressed and poisoned for a short period of time. It is advisable to use probiotics such as Bacillus, EM bacteria, and sediment modifiers in advance of the 3-5 days before the nets to improve the water environment. Many farmers believe that it is not worth spending money on drugs before selling fish. In fact, if you reduce the number of dead fish when you pull the fish, it is still more cost-effective.

The third step is to use anti-stress products, especially pure Chinese medicine anti-stress products, for 5 to 12 hours before Paula nets. Mild and no drug residues can reduce the amount of fish movement. The fish and shrimp are frightened when pulling the net, the stress response is obvious, and it is easy to cause tissue bleeding and mechanical damage. Application of "Ginger Kushen Liquid" (trade name) and "Compound Kushen Kosuisan Powder" (commercial name) 5-12 hours prior to pulling the net can effectively improve the anti-stress ability of the fish and allow the fish to be slightly anesthetized to reduce the fish body. Activities, protection of mucus and ensure that the mechanical damage of fish and shrimp from water mold infection.

Step 4: Reapply the “Ginger's Sophora flavescens” with high concentration in the cage after adding the net, which can effectively increase the mucus, shrink the scales, and strengthen the anti-stress ability.

Step 5: Apply the water purification agent immediately after the net is pulled. Since the entire water body of the net is stirred, the fish that have not been pulled are very likely to become ill and quickly apply chemical water purification agents such as alumina, polyaluminum chloride, zeolite powder and other purified water bodies.

The use of “five-step nets” to catch fish and shrimps is safe, simple, low-cost, and free from drug residues. It meets the quality and safety requirements of aquatic products and can be used for fish, shrimp, crabs and shellfish. The aquaculture process has already invested a certain amount of seed, feed, management costs, and done the final maintenance. The reduction of dead fish during the harvest season is to increase the net profit and is worth a try.

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