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How to tell male from female yellow catfish? A few practical methods
Yellow catfish, commonly known as geyayu, is a fish native to this area. It is a widely distributed bottom-dwelling fish, and its reproduction rate and yield in Nansi Lake are second only to crucian carp in catch volume. The yellow catfish has a yellowish-brown body, with a large hard spine on the back and tail respectively, a large head and a wide mouth. It grows rather slowly; in the 1950s the largest individuals reached more than 200 grams, close to half a jin. After the 1980s, because of excessive catching, its body weight gradually decreased; common individuals are about 15 cm long and weigh around 80 grams, while female yellow
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Dried fish roe
The ovaries of the monkfish are at their fullest in spring, and their color is also relatively vivid, like a long red-yellow ribbon piled up in the abdominal cavity. After dissection, take out the roe and wash it clean with seawater, hang it on bamboo poles to dry in the sun, or cut it into 1 m long strips and lay them out on mats to dry; after they take shape, turn them over, dry until fully dry, fold into 50 cm strips, tie into small bundles, then bundle into larger packages or pack in rectangular baskets. The finished product is dark red, with flat roe strips, uniform drying, and a normal smell. The roe can also be steamed into a cooked dried product. When the fresh roe is sun-dried until half dry,
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Application method of simple temporary holding facilities for fish
At present, there are quite a few flow-through aquaculture farms in Sichuan, mainly culturing cold-water fish species, and most of their culture facilities use concrete ponds. During the earthquake, these concrete ponds were damaged to varying degrees by the destructive force of the earthquake, which may cause pond leakage and so on. If they are not repaired in time, the water in the ponds may be lost, creating a crisis for the survival of the cultured aquatic organisms, and even causing all the water in the ponds to run out, resulting in the death of the cultured aquatic organisms and bringing huge economic losses to the farmers. If
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How to use folk remedies to rescue fish after poisoning
1. Derris poisoning. In real life, we often see the phenomenon of using derris to poison fish in small rivers and streams, and a slight carelessness often threatens the pond fish being raised. At this time, the best method is to first block the toxic water from entering the pond; at the same time, splash human urine diluted with water over the whole pond. The dosage is about 25 kg of human urine per 1 mu of water surface at an average depth of 1 m (that is, 667 cubic meters), diluted with water to 50 kg, then splashed evenly over the whole pond. This has an obvious effect on rescuing fish that have just been poisoned or have not yet been poisoned. 2. Tea seed cake poisoning. Tea seed cake is usually used to poison ponds or in small amounts to prevent and treat fish diseases,
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A Comprehensive Analysis of Key Points for Drug Use in Fish Farming
In recent years, China's aquaculture industry has developed rapidly, and the degree of intensification in aquaculture has also been increasing quickly. At the same time, the aquaculture environment has been continuously deteriorating, causing a decline in the immunity and disease resistance of cultured species, while the incidence of disease has increased significantly. Moreover, due to factors such as mutations in pathogenic bacteria, new diseases and difficult-to-treat diseases have frequently emerged. At present, these diseases are mainly treated with medication. This article discusses the development, classification, factors affecting drug action, and problems existing in the use of fishery drugs in China. I. The Development of Fishery Drugs
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How is fish maw processed? Detailed methods and steps
Fish maw is not the fish's stomach, but the fish's swim bladder, which is why fish maw is also called fish swim bladder. The swim bladder is the organ in a fish's body that allows it to rise and sink in the water. The swim bladders of the Sciaenidae family and marine eels are relatively well developed, while the swim bladders of many fish species have degenerated. There are many kinds of fish maw, among which soft-shelled turtle fish maw, yellow-lipped fish maw, large yellow croaker maw and eel maw are all precious fine products. Fish maw is one of the eight treasures of seafood, delicious in taste and very high in nutritional value. Its main nutritional components are viscous colloidal high-grade protein and polysaccharide substances. According to measurements, every 100 grams of dried fish maw contains 84.4 of protein and 0.2 grams of fat
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How to prevent and treat common diseases in ayu (sweetfish) farming?
I. Vibriosis 1. Pathogen: mainly Vibrio anguillarum. 2. Symptoms: depending on the species of Vibrio infecting the fish, it can be roughly divided into three types: yellow-liver type, pointed-intestine type and ulcerative type. Sick fish swim weakly, have darkened body color, protruding eyeballs and skin hemorrhages that in severe cases extend deep into the muscle layer; there is congestion and then ulceration on the inner surface of the operculum, the base of the fins and the tip of the snout; the anus is red and swollen; the gills are pale; the liver of sick fish is enlarged, in some cases entirely faded to a yellowish-earth color, in others partially faded and congested; blister-like structures filled with bloody fluid appear in the liver of sick fish; the gallbladder is enlarged, and the
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Detailed Explanation of Key Techniques for Enclosure Fishing in Large Water Bodies
For enclosure fish farming in large water bodies, due to the large area and difficulty of catching fish, most farmers currently still drain the water to catch fish during New Year's Day and the Spring Festival each year, which not only wastes water but also affects profits because fresh fish flood the market at the same time. To resolve this contradiction, technicians at the aquaculture farm of Jiangsu State Farms Linhai Farm, through years of practice, have developed a new technique for fishing in large-water-body enclosure aquaculture. This technique takes advantage of fish's habit of swimming against the current: at the water exchange inlet of the fish pond, a fishing pool 3 m wide, 5 m long and 2.5 m deep is built, with a 1 m wide outlet on the side facing the fish pond.
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Detailed Explanation of Key Technical Points for Stocking Icefish in Reservoirs
For the selection of stocking sites, choose as far as possible reservoir bays that are at a certain distance from the shore, with a water depth of about 2 m, a hard mud-sand or gravel substrate, and relatively abundant small prey organisms such as insects, and select several stocking sites at the same time for multi-point stocking, so as to avoid failure caused by improper stocking at a single point. Method for stocking fish eggs: when the fertilized eggs arrive at the destination, first place the nylon bag containing the fertilized eggs into the water, and when the water temperature inside the bag and the reservoir water temperature are basically the same (temperature difference less than 3°C), slowly and evenly scatter the fertilized eggs into the water; each release point should have a certain range
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How to make fish, vegetable and rice cereal: recipe and detailed steps
Ingredients: rice cereal (or infant rice cake), 15-25 g each of fish and green vegetables, a pinch of salt. Method: soak the rice cereal in a little water until soft, stir into a paste, put it in a pot, bring to a rolling boil over high heat for about 8 minutes; wash the green vegetables and fish, chop each into a paste and add both to the pot, continue cooking until the fish is thoroughly cooked, season and it is ready. The secret of calcium supplementation: fish is rich in calcium, which not only helps your baby grow taller and supports bone development, but also promotes brain development and meets the body's need for a variety of nutrients, so you may want to regularly
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