Fish skin trematodes (the third generation of worm gyrodaclylus sp.)
Signs of infection when serious infection, fish will rub on hard objects, the skin will appear opaque and may become inflamed. A less severe infection may not show any symptoms that are easy to detect. Most species of freshwater and marine fish are infected by third-generation insects and related species.
Infection details skin trematodes are trematodes up to 0.8 mm in length. They attach themselves to the fish's skin (occasionally to the gills) through a sucker with two hooks in the center, and feed on skin cells. Trematodes on skin crumbs can be clearly seen under a low-power microscope. The third generation is paragonimus, that is, the unpredictable phenomenon of the whole life, and even the larva has a younger larva to develop in its body, this worm has another worm in its body, and so on.
The recommended treatment: soaking fish in 3% salt solution can get rid of parasites. The alternative is to use a new anti-parasite drug. Fish live in a clean environment with good filtering conditions, it is possible to minimize infection, the third generation of insects do not return to produce resistant eggs. As the ring worm explains.
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Crab fishing technique on large water surface
In autumn, the gonads of adult crabs begin to mature and prepare for their annual reproductive migration. At this time, lakes, reservoirs, ditches and other large surface aquaculture crabs should be caught in time, in order to avoid the loss caused by escape crabs. First, fishing time to determine the appropriate time to catch crabs is a key to improve the efficiency of raising crabs, neither too early nor too late. Too early will affect the growth of the river crab, is not conducive to the increase of yield; too late, the river crab will escape after sexual maturity, resulting in losses. The appropriate fishing time should be from the source of river crab and stocking rules.
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Six conditions affect the feeding of fish
In the process of intensive fishery production, the management of feed feeding is one of the main links in the whole production management, and the decrease of feed intake of fish often occurs in the process of feed feeding. According to the different conditions in the production, the reasons for the decrease of feed intake of farmed fish are as follows: the first situation: the fish is suffering from the disease, which leads to the decrease of feed intake of fish. Such as Carassius auratus endosporidiosis, grass carp three diseases, spotted forktail disease, enteritis and other diseases, the food intake of fish decreased significantly. When grass carp and crucian carp have a lot of wheels
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