-
What are the green and eco-friendly fishery drugs? Introduction to several commonly used varieties
Quicklime, table salt, and the like, although not specialized fishery drugs, are effective for preventing and treating aquatic diseases, and they pose no threat to the environment, with no drug residue problems. Quicklime: regularly splashing quicklime into the aquaculture water body can not only reduce the occurrence of many diseases, but also provide the calcium element essential for aquaculture organisms, which is especially important for crustacean aquaculture. Method of use: choose quicklime that has not weathered; for pond clearing and disinfection use 150-200 kg per mu; for disease prevention and treatment, generally 5-9, use once about every 20 days, for a water depth of 1
-
Techniques for rearing summer fry fish: stock one main fish species, do not introduce carp, and combine feed with fertiliser for intensive feeding
Summer fry fish are small and delicate, with a weak ability to withstand adverse environments. In addition, at this stage the summer fry undergo a dietary transition, and their digestive system structure and function are not yet fully developed, so their digestive capacity is poor. If rearing methods are improper, mass mortality will occur. Through experiments, the author found that adopting the following rearing methods can significantly increase the survival rate and rearing efficiency of summer fry. Scientific stocking and rational matching: the traditional rearing method is mainly polyculture of multiple species. However, from production practice, because fish have different feeding habits, this kind of rearing
-
How to manage pond fish in autumn? Getting them to fatten up is key
The golden autumn season is the peak period for fattening fish, and doing a good job of feeding and management during this period is the key link to increasing fish production and improving economic returns. The main measures are as follows: 1. Improve water quality. Maintaining good water quality is an important condition for promoting fish fattening, so new water should be added frequently to increase the dissolved oxygen content in the water. Generally, add new water once about every 5-6 days, with each water exchange of 15-25 cm. Sprinkle quicklime solution 2-3 times a month to eliminate bacteria and increase calcium. Generally, for a pond with a water depth of 1.5 m, use 10-15 kg of quicklime per mu each time.
-
Fish feeding is affected by 6 situations, and farmers need to pay attention
In the process of intensive aquaculture production, the management of feed feeding is one of the main links in the entire production management, and during the feed feeding process, the phenomenon of reduced feed intake by fish often occurs. Based on different situations in production, the author analyzes the reasons for reduced feed intake by farmed fish as follows: The first situation: fish are suffering from disease, causing reduced feed intake by fish. For example, when crucian carp inner spore disease, grass carp three diseases, channel catfish hemorrhage disease, enteritis and other diseases occur, the feed intake of fish is significantly reduced. When grass carp fingerlings and crucian carp have large numbers of wheel
-
Identification and Control of Gyrodactylus, a Skin Fluke of Fish
Signs of infection In severe infections, fish will rub against hard objects, and the skin develops opaque patches that may become inflamed. Less severe infections may not show any easily noticeable symptoms. Affected fish Most species of freshwater and marine fish can be infected by Gyrodactylus and related species. Details of the infection Skin flukes are flukes up to 0.8 mm in length. They attach themselves to the fish's skin (occasionally to the gills) by means of a sucker with two central hooks, and feed on skin cells. At low
-
A detailed guide to making Boiled Fish with Vermicelli - numbing, spicy, fragrant, and perfect with rice
Stewing is also a form of boiling, just for a longer time, so I classify this as a stewed dish too. Eating this seems quite popular now, so I make it as well; if I didn't, it would look like I don't know how. Slice the fish, add a little salt, pepper, and cooking wine, and mix gently, because the fish is tender and you don't want it to break. Then add a little egg liquid, a little starch and oil, and stir evenly - this is what's called velveting. Put a little oil in the wok, add the three brothers and doubanjiang and stir-fry until fragrant, add water or meat broth, and once the water boils, add the greens and vermicelli and cook until done, then scoop them out
-
What are the main technical measures for polyculture of fish and soft-shelled turtles?
1. Pond renovation: Build a 30 cm high escape-prevention wall around the pond, with the four corners rounded into arcs, smooth the inner wall with cement, and it is best to have an inverted-L-shaped coping on top of the wall to prevent the old soft-shelled turtles from escaping. Set up bamboo rafts in the fish pond as sunning platforms for the old soft-shelled turtles to bask their backs, and there is no need to add other necessary equipment such as feeding platforms. 2. Reasonable stocking: filter-feeding fish that feed on plankton, omnivorous fish, and herbivorous fish can all be polycultured in the same pond with old soft-shelled turtles, but black carp should not be stocked in fish-turtle polyculture ponds. 3. Reasonable stocking density of old soft-shelled turtles. If the main approach is to use
-
What are the key points to note when catching fish?
1. Choose a clear day with lower nighttime temperatures to start hauling the net; do not haul the net on overcast or rainy days, when fish are gasping at the surface, or when fish are sick. 2. Feeding should be stopped or reduced the day before net fishing; do not feed heavily just to increase the fish's body weight. The day before catching, remove stakes, branches, floating debris, and other objects from the pond to reduce the time spent hauling the net and sorting fish, minimizing losses. 3. For the first haul, start setting the net from 1/3 to 1/2 of the pond, to prevent too large a catch from being sorted in time and causing injury and death to the fish; this way
-
What are the basic principles of fish health management
The concept of fish health management is that fish raised under such conditions will achieve optimal growth rate, feed conversion rate, reproduction rate and survival rate. Maintaining a high-quality aquatic environment and feeding nutritionally balanced feed are very important for maintaining fish health and preventing fish from becoming diseased. Proper fish health management should aim at environmental, nutritional, economic and other factors to prevent fish diseases rather than focusing on treating fish diseases. The following are some basic principles of fish health management. 1. Pay attention to the environment
-
Fish fungal disease is caused by water molds
Signs of infection The obvious sign of infection is cotton-wool-like growths, usually white, but sometimes grayish black to green. The fungus usually starts on the body and trunk, but it may also originate at a site with some injury, and it can spread to attack the fins, mouth, eyes and gills. Affected fish All fish may be harmed. Details of infection Fungi are plants that grow on dead organic matter. The typical fungal body, or mycelium, is made up of very fine filaments or external hyphae, and the external hyphae pierce dead or decaying
条件筛选