The first is the discovery of fish diseases. Under normal circumstances, farmers can determine whether fish disease will occur from the following aspects:
1. Judging from the feeding conditions of farmed fish. When the environmental factors such as weather and water temperature do not change so much, the food intake of fish suddenly drops or even stops, which indicates the possibility of fish disease.
2. Judging from the activity of the fish. If there are fish in the water or on the water, they are traveling alone, slow in action, or floating on the shore; some fish are characterized by irritability, mad swimming in the water, rotating, often jumping out of the water or the tail often curling out of the water, etc. All are signs of a possible fish disease.
3. Judging from the color of the fish. Most of the sick fish will have body color changes. Such as body color, body color fade, red body color or body color and other abnormal conditions.
Second, on-site investigations must first investigate the specific conditions of the water environment and surrounding environment in the aquaculture waters. The water environment has a direct impact on fish. In addition to fish diseases caused by infections and infections by pathogens and predator organisms, the influence of the surrounding environment and water conditions on the fish is also very important. In the waters where fish diseases occur, it is necessary to understand the changes in environmental factors such as sediment, water quality, water temperature and water color, and to understand whether toxic and hazardous substances have entered the aquaculture waters. The second is to understand the situation of aquaculture management. For example, the feeding of deteriorating feeds can easily trigger fish outbreaks; the application of under-fermented organic fertilizers or over-fertilization can lead to deterioration of the pool water and trigger fish outbreaks of red dermatosis and rot. Rickets and so on. Therefore, when investigating, it is necessary to know in detail the management situation of feeding, fertilization, and stocking densities, species and specifications, matching ratios, and fishing operations. We must also understand the weather changes and the occurrence of various disease organisms, as well as the history of fish disease in this water area over the years.
The third is the fish body inspection fish examination is the key to the correct diagnosis of fish disease.
1. Body surface. Place the diseased fish or fish just after death into a white porcelain dish, observe carefully from the head, mouth, eyes, lid, scales, fins, etc., according to the symptom analysis, and observe The symptoms were linked and analyzed comprehensively.é‡ç‚¹ The key part of the inspection is silk reeling. First check the appearance of the palate to see if the palatal lid is open. Then use a pair of scissors to remove the palatal cap. Observe whether the palatal color is normal, if there is more mucus, and if there is any foreign material on the sepal. Or parasites, if there is swelling or ulceration at the ends of the silk.
2. Internal organs. Visceral examination should be based on the main intestinal. First cut off the abdominal wall of the diseased fish (be careful not to use the internal organs), observe whether there is ascites and macroscopic parasites visible to the naked eye, and then observe whether there are abnormalities in the appearance of each internal organ. Finally, cut the throat of the throat and the proximal hindgut with scissors, remove the viscera and put it into a white porcelain dish, and separate the liver, gallbladder, and gills one by one. Then cut the intestine from front to back into front and middle. In the third and last paragraph, remove feces and food, and carefully observe whether there are any parasites or other diseases in the intestinal tract. Under conditional conditions, microscopic examinations may be combined with visual inspections in order to prescribe the right medicine.
The greenhouse a filled with equipment like hydroponic, irrigation, auxiliary lighting ,temperature and humidity control and also may be automatically controlled by a computer to maximize potential growth.
Hydroponics can be used to make the most use of the interior space. The relatively closed environment of a greenhouse has its own unique management requirements, compared with outdoor production. Pests and diseases, and extremes of heat and humidity, have to be controlled, and irrigation is necessary to provide water. Most greenhouses use sprinklers or drip lines. Significant inputs of heat and light may be required, particularly with winter production of warm-weather vegetables.
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