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Detailed Explanation of the Large Icefish Processing Technology Series (Part One)
Large icefish, also known as noodlefish, was originally widely distributed in the main stream and affiliated lakes of the middle and lower reaches of the Yangtze River. Its flesh is tender and delicious, rich in nutrients, and eating it carries a special fresh cucumber aroma. Large icefish generally has a body length of about 20 cm, with no bones or spines. It is a small, precious fish species with high economic value and is highly popular in domestic and international markets. Two processing methods for large icefish are introduced here: I. Processing of quick-frozen large icefish. 1. Preservation and transportation of raw fish. Large icefish has a small body and thin skin, making it extremely prone to spoilage.
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A Detailed Explanation of the Processing Technology of Caviar and Fish Roe
The ovaries of various spawning marine fish, shellfish and freshwater fish can be used as food, and in many parts of the world fish roe is considered a very nutritious food, with high protein content, less contaminated raw materials and good-tasting finished products. Therefore, fish roe products are very popular in markets around the world. 1. Caviar processing The term "caviar" is often used to refer to fish roe produced in a special way. In the past, the black caviar was a delicacy in foreign royal courts; now it is a beauty and health recipe for fashion-conscious people and friends who love good food yet still worry about losing weight.
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What causes oxygen depletion in pond fish in winter?
This is because when the air temperature drops, in deep-water ponds, fertile-water ponds and high-density cage aquaculture waters, the water temperature at the surface is lower than that of the lower layer, and the specific gravity of the water is greater than that of the lower layer. Thus the cold surface water sinks and the warm lower-layer water rises, forming vertical convection of the water body. The water in the deep layer is low in oxygen or even anoxic, and the low-oxygen and anoxic water rises, causing severe oxygen depletion in the upper water body. On the other hand, this vertical movement of the water body accelerates the oxidative decomposition of organic matter such as leftover feed and feces deposited at the bottom of the pond, increasing the oxygen consumption within the water body. On yet another hand, in winter there is
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How should fishery drugs be used in a standardized way? Master these key points for medication
Fishery drug residues are currently the most common source of contamination in aquatic products. There are many reasons for excessive drug levels in aquatic products, among which the abuse of drugs and feed additives is the main culprit. Standardized medication is a fundamental measure for preventing excessive drug residues in aquatic products, improving the quality of aquatic products and crossing the "green barrier". For this reason, the author discusses how to use fishery drugs in a standardized way from the following aspects, for the reference of the vast number of farmers. 1. Strictly implement national laws and regulations In recent years, relevant departments have successively issued
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A Detailed Guide to Selecting and Choosing Breeding Angelfish
Let's talk about breeding angelfish. First, when selecting breeding fish, choose healthy young fish with strongly contrasting, vivid colors and good body shape, and raise them from a young age. As for the issue of "disabilities," you need to look at it from two sides. Some disabilities must be firmly avoided when selecting fish, such as: a crooked body, deformed head or mouth, etc.; but ordinary external injuries, damaged scales or fins, and so on are minor problems that will not affect breeding quality. When raising breeding fish, pay attention to four issues: first, increase the amount of water changed, and it is better to change less at a time but more often; you can do it once every three days, 30
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Fish species quality identification methods, teaching you to accurately select high-quality fish species
1. Check whether the size is uniform. For the same species of fish, those with uniform size when harvested from the pond generally have a relatively robust constitution. 2. Check whether the fish body is glossy. Robust fish species have a layer of mucus on the body surface to protect the scales and skin from pathogen invasion, so the body surface shows a certain gloss. However, diseased, weak, or injured fish species lack mucus on the body surface and have no gloss, or some diseased fish have excessive mucus on the body surface and also lose their gloss. 3. Check the body color of the fish species. The body color of the fish species reflects their quality. The body surfaces of high-quality fish species are respectively:
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Prevention and Treatment of Common Bacterial Diseases in Fish
1. Hemorrhagic disease Causes: Deterioration of water quality at the bottom of the fish pond, low dissolved oxygen, high levels of harmful substances, poor aquaculture management, or feeding moldy and inferior bait can all trigger this disease. Prevention and treatment methods: Strengthen feeding management and carry out comprehensive prevention. Use medications regularly; dibromohydantoin, bromochlorohydantoin, herbal extract preparations, etc. can be used to disinfect the water body; or use beneficial bacteria such as photosynthetic bacteria to purify water quality; add immunostimulants to the bait, and use zeolite powder and nitrite degrading agents to absorb and degrade harmful substances such as ammonia, nitrogen and nitrite in the water. After the disease occurs
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What measures are there to ensure the supply of fish fry and fingerlings?
Purpose and application: In response to problems such as severe damage to farmed fish fry and fingerlings in disaster areas and tight supply, countermeasures such as strengthening breeding and collecting broodstock are proposed to make every effort to ensure the supply of fry and fingerlings. Technical measures: 1. Gather statistics to understand the quantity of fry and fingerlings needed for restoring production in the region and the fry and fingerling production capacity, identify the shortfall in fry and fingerlings, and contact fry and fingerling production farms as early as possible to supplement high-quality healthy fry and fingerlings for restoring production. 2. Pay attention to understanding and grasping market information on broodstock and do a good job of collecting broodstock.
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Detailed Explanation of Key Technical Points and Management Methods for Fish Fry Rearing
After the summer fry are divided into ponds, the 1-year-old fingerlings reared until the end of the year to a size of 12-15 cm and a body weight of 30-40 g are called spring fingerlings. The growth cycle of black carp and grass carp is 3-4 years, and in some places the 1-year-old fingerlings are reared into 500 g 2-year-old fingerlings. 1. Fingerling ponds: To rear large-size fingerlings, it is recommended to build dedicated fingerling ponds with an area of 3-5 mu and a water depth of about 2 m. The preparatory work before the summer fry are stocked into the ponds is the same as for fry ponds. 2. Stocking: There are two methods, monoculture and polyculture. Polyculture is generally adopted. For ponds mainly stocked with common carp, common carp 6
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Witnessing the pollution scene! Large numbers of dragonfly nymphs and stream fish die downstream of the factory; the alliance calls on TSMC to keep its partners in line
Witnessing the pollution scene! Large numbers of dragonfly nymphs and stream fish die downstream of the factory; the alliance calls on TSMC to keep its partners in line
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