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Effective prevention methods for fish surfacing in summer
I. Prediction of fish surfacing 1. In summer, strong sunlight and high temperatures during the day, and weather in the evening. Sudden thunderstorms or a south wind during the day with high water temperature, then a sudden turn to a north wind at night, causing the water temperature to drop rapidly. 2. Continuous overcast and rainy weather, low air pressure, muggy conditions, weak wind, and foggy weather. 3. Long periods of clear weather without rain, fish feeding vigorously, dense water color, and sudden weather changes. II. Rescue of fish surfacing, 1. Add fresh water Adding fresh water increases dissolved oxygen, improves water quality, and expands the range of activity for fish. 2. Turn on the aerator
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A Detailed Guide to Selecting and Using Fishery Drugs: A Practical Guide for Farmers
When selecting fishery drugs, the "three certificates" must be complete (production license, production approval certificate, execution standard number), and there must be a product quality certificate. Legitimate fishery drug manufacturers have applied for registered trademarks; the trademark design, image, text, etc. are indicated on the packaging, labels, and instructions, and are marked with the words "registered trademark" or a registration mark. The quality of the inner and outer packaging materials of fishery drugs should be good. Generally, the packaging is marked with instructions for use, trade name, chemical name, drug composition, content, production approval number, manufacturer name, address, production batch number, production date, validity period, indications or functions and main treatments,
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Symptoms and Control Methods of Brooklynella Disease in Lionfish
Pathogen: This parasite belongs to the genus Scyphidia (family Scyphidiidae, order Sessilida) found in grouper. In side view, the dorsal side is convex and the ventral side is flat; in ventral view, the body is oval or egg-shaped, measuring 45-80 x 29-53 um. The anterior ventral surface has a circular cytostome that can extend and retract. Cilia are present on the anterior part of the body and the anterior edge of the dorsal side. Behind the macronucleus there is a petal-like structure resembling a flower. This parasite reproduces by division. Epidemiology: The disease is prevalent in hot weather and mainly affects fry measuring 20-50 mm. Water temperature above 25 degrees C. In high
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How to identify high-quality fish fry? Just look at these few points
First, look at the size of the fry. In the same pond, the same species of fish should be uniform and even when harvested, with little difference in body length and body weight. On the contrary, poor-quality fry with large individual differences and uneven size often have a very low overall survival rate due to competition for food, mixed genetics, poor rearing, and other reasons. Second, look at the body color of the fry. High-quality fry have bright, glossy body colors. Different species and different rearing methods produce fry with different body colors. Generally speaking, high-quality silver carp fry should have a silver-gray back, with silvery-white sides and belly; high-quality grass carp fry are pale
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Auxiliary Application of Carbon Dioxide and Carbonic Acid in Live Fish Transport
Carbon dioxide-assisted live fish transport is a new technique that keeps live fish in a sleep-like state for extended periods to reduce transport costs. When using carbon dioxide to assist in transporting adult carp, the adult carp must be alternately perfused with carbon dioxide gas at a high partial pressure (27-33KPa) and a low partial pressure (13-17KPa); the transport time can be maintained for about 10 hours, with a very low mortality rate. A mixed gas of carbon dioxide and oxygen (50:50) can also assist in transporting live fish. In this case, gas can be directly injected into the water containing crucian carp and
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Key Technical Points for Disease Prevention and Control in Pollution-Free Fish Farming
Symbiosis of plants and animals: When aquatic plants and fish live together in the same pond, the fish rarely get sick. The aquatic plants planted in the fish pond are rice or lotus roots, arranged in an east-west direction, with wide row spacing (greater than 33 cm), occupying no more than 50% of the total water area so that the lighting effect is good. The water depth depends on the water tolerance of the aquatic plants; for rice it is generally within 30 cm, and for lotus roots it can generally reach more than 50 cm. The farmed fish can be conventional species or famous, special and improved new varieties. The farming method can be seedling breeding or adult fish farming. Because residual bait, fish feces and so on are deposited
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Several Practical Ways to Improve the Effectiveness of Fish Medications
1. Improve the binder. The binder must be strongly adhesive, otherwise the medication is easily lost in the water. Standard wheat flour is a good binder material. For swallowing fish, it is best to make pellet medicated bait or ball-shaped medicated bait. 2. Add a feeding attractant. Fish have a sensitive sense of smell; even if 1 gram of alanine is dissolved in 1000 tons of water, fish can still detect it. For example, grinding the strongly aromatic Chinese herbs star anise and Angelica dahurica into fine powder as a feeding attractant, mixing it into fish medication at a ratio of 10%-20%, or adding
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Large icefish
(Salangidae) Protosalanx hyalocranius [Local names] Mianwu fish, Miaozhang fish, mud fish. [Morphological characteristics] The individual is small, with the body length of an ordinary individual about 15 cm. The body is slender. The head is flat on the top and bottom. The snout is pointed and triangular. The lower jaw is longer than the upper jaw. The distance from the origin of the dorsal fin to the base of the caudal fin is greater than that to the base of the pectoral fin. The body is transparent. There is a row of black pigment spots on each side of the ventral surface. When sexually mature, the anal fin of the male becomes fan-shaped, with a row of scales at its base, and the pectoral fins are large and pointed. [Origin, production season] It occurs in both seawater and freshwater, and is distributed
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Technical key points and precautions for stocking fish fingerlings in winter
1. "Five conversions" of fish ponds. Convert "small ponds" to "large ponds", "stagnant ponds" to "live-water ponds", "shallow ponds" to "deep ponds", "leaking ponds" to "water-retaining ponds", and "emergency ponds" to "flood-control ponds". When renovating ponds, first drain the pond water, and after sun-drying, remove excess sludge from the pond bottom, keeping only a 15-20 cm layer. Remove weeds, dredge channels, and raise the pond embankments. 2. Pond clearing and disinfection. Keep the pond at a water depth of 10 cm. First, for every 667 sq m of water surface, use 90 kg of quicklime or 4 kg of bleaching powder containing 30% chlorine,
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What are the prevention and treatment methods for toxic water disease in fish?
Water is the air that fish breathe to survive. In recent years, water bodies have suffered pollution (such as excessive dissolved oxygen, excessive metals, water oxygen deprivation, etc.), causing toxic water disease in fish and resulting in mass deaths. The following methods can be used to diagnose and rescue fish suffering from toxic water disease in water bodies. 1. Toxic water disease from excessive dissolved oxygen. Excessive dissolved oxygen in water bodies can cause eutrophication, leading to bubble disease and many other illnesses in fish. 1. Harm and symptoms. Because too much unfermented fertilizer is applied to the water body, fine small bubbles of methane and hydrogen sulfide are decomposed at the bottom of the pond, and fry mistakenly swallow them as food. The main symptoms are that many small bubbles adhere to the fish gills, causing the fish body to float upward or lose balance; there are white bubbles in the fish intestines, or many bubbles attach to the body surface, fin rays, and gill filaments, and the fish body floats on the water surface, which can cause fish death in severe cases.
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