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What diseases are fish prone to when suffering from malnutrition?
With the rapid development of factory farming, the use of compound feed is becoming more and more widespread. However, some compound feeds cannot meet the nutritional needs of fish due to raw material problems or formulation technical problems. In particular, feed designed, formulated, processed and produced by small feed mills and farmers themselves may cause nutritional deficiencies or excesses, weakening the fish's constitution and, in severe cases, causing fish death. This article will discuss the causes of fish diseases from the nutritional aspect, in order to guide farmers to take timely measures in breeding production to prevent fish diseases.
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How do you prevent the fish skin from breaking when deep-frying fish? Sharing practical methods
If you can't master the essentials when making fried fish at home, you'll often damage the fish skin, which not only burns the fish flesh and affects how tender and fresh it is, but also ruins the fish's appearance. Now, please listen to the experience of the chefs. 1. Before pouring oil into the wok, take a piece of fresh ginger, cut it into thin slices, rub it all over the inner wall of the wok, then add oil and heat. 2. Decide how much oil to use based on the size of the wok and the size of the fish. If the wok is small and the fish is large, it is best to cut it into pieces before frying, and the amount of oil should at least cover the fish.
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What to Do When Roses Get Black Spot? Detailed Guide to Prevention and Control Techniques
Rose black spot occurs in many places. The disease harms roses, causing leaves to turn yellow and drop early, triggering a second flush of leaves in the same year, weakening the plant's growth vigor and reducing cut flower yields. I. Symptoms Rose black spot mainly infects leaves, but also infects petioles, veins, young shoots and other parts. In the early stage of the disease, small brown spots appear on the upper surface of the leaves, gradually expanding into circular, nearly circular or irregular lesions. The lesions are 2-12 mm in diameter, blackish-purple, with radiating edges. In the later stage, the central tissue of the lesions turns grayish-white, scattered with many black
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What should be noted when cultivating shiitake mushrooms off-season?
Shiitake mushrooms cultivated off-season can usually fruit in spring; such shiitake mushrooms are of good quality, fetch a high price, and have a good market. To develop shiitake cultivation in the future, the number of off-season crops must be increased, so that supplies are available to the market year-round and economic returns can also be raised. The principles and methods of off-season cultivation are basically the same as those of spring cultivation, but the following four points should be noted: 1. Inoculation season: inoculation should be carried out when the local average temperature is steadily below 10°C. 2. During the spawn-running process, the temperature requirement of 7-13°C should be met as much as possible; spawn running can be carried out in a greenhouse or a single-board machine room (referring to a room with a temperature of 0-13°C).
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What to do when cotton develops red leaf blight during the boll-setting stage
Control measures for cotton red leaf blight: 1. Apply fertilizer reasonably, and skillfully apply the cotton topping fertilizer; nitrogen, phosphorus and potassium should be applied together or foliar fertilizer should be applied. 2. Strengthen field management, cultivate frequently, improve root respiration conditions, promote root development, prune and remove side branches in time, remove old leaves and control pests and diseases. 3. Spray for protection, using 70% mancozeb or 75% chlorothalonil 600-800 times solution or 70% thiophanate-methyl 800-1000 times solution plus foliar fertilizer (potassium dihydrogen phosphate, Lvzhiyuan, etc.) for spraying, once every 5-
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What to do when turtle egg hatching rates are low? Technical measures to improve the hatching rate
It is well known that turtles are highly resilient, rarely suffer from disease, and are easy to raise and manage, but this applies to adult turtles. Throughout the entire process of raising turtles, carelessness in certain steps and details is unacceptable; turtle egg incubation is a highly technical step, and if done poorly it will fail. 1. Scientifically breed parent turtles. Selecting good stock is the primary condition for improving the hatching rate of turtle eggs. Parent turtles should be large, robust, free of injuries or deformities, and of suitable age. Female turtles should be at least 6 years old, with wrinkled and slightly hard leathery skin along the rear edge; male turtles should be 3 to 4 years old. The stocking density should be 7 turtles per sq m,
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Black locust is easy to establish when planted in autumn, and autumn is exactly the right season for planting
In the past dozen years or so, spring drought has been severe in Lincheng County, with temperatures rising quickly and soil temperatures rising slowly. Especially after newly planted black locust seedlings are watered, the soil temperature remains low for a long time, causing the aboveground parts to sprout and grow while the root system recovers slowly, which reduces the survival rate of black locust. In autumn, by contrast, temperatures gradually drop, transpiration is lower, soil moisture content is relatively stable, and black locust seedlings have accumulated relatively rich nutrients. Tree roots have no natural dormant period, and when the soil temperature is still high, the roots of black locust planted in autumn can still resume growth. As long as the winter frozen soil layer is not thick,
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What to Do When Shiitake Mushroom Logs Are Burned by Heat and Rot? Cause Analysis and Preventive Measures
From late June to early August 2003, Lishui City, Zhejiang Province experienced a historically rare continuous high-temperature and low-rainfall weather lasting more than 40d, with temperatures exceeding 40°C for 14d, among which the urban area of Lishui reached 43.2°C, breaking the historical extreme and ranking first in the country. This brought serious impacts on people's production and daily life, especially dealing a devastating blow to shiitake mushroom production. The mycelium of shiitake mushroom logs, harmed by high temperatures, exhibited phenomena such as black liquid oozing, rotting and log disintegration. Of the city's 350 million bags of flower shiitake mushroom logs, 150 million bags rotted due to high-temperature mycelium burning, accounting for
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What to Do When Shiitake Mushroom Logs Rot? Detailed Analysis of Causes and Control Techniques
In recent years, varying degrees of log rot have appeared in some shiitake-producing areas, causing waste of resources and economic losses for mushroom growers, and in some areas it has seriously threatened the development of the shiitake industry. For example, in Xianliang Town, Qingyuan County, Zhejiang Province, the log rot rate in 1999 reached 17%, with some individual growers exceeding 50%, resulting in heavy losses. In response, we have conducted dedicated research since 1999 and have preliminarily identified the causes of rot and control techniques. 1. Causes of log rot. Log rot mostly occurs in old mushroom-producing areas with many years of cultivation, and its fundamental
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Five key points to remember when spraying foliar fertilizer on cotton
Cotton leaves are the most important nutritional organs of the cotton plant, possessing four functions: photosynthesis, respiration, transpiration and absorption. By making use of their absorption and photosynthesis, targeted foliar spraying of fertilizer can promote steady plant growth, strengthen resistance to disease, pests, drought and premature aging, regulate vegetative and reproductive growth, and greatly increase yield and quality. 1. Spray type: scientifically choose the foliar fertilizer according to the cotton's growth vigor; for excessively vigorous cotton seedlings, spray a 0.3%-0.4% potassium dihydrogen phosphate solution or a 2% borax solution
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