Coral reef fish disease
Signs of infection fish may rub on hard objects, careful examination, may find fish skin fog, Gill may be inflamed, the affected fish show typical rapid Gill movement. Many species of marine fish have been found to suffer from the disease.
Infection details Oodiniumocellatum is a parasitic single-celled organism called dinoflagellate. A careful examination of it requires a microscope with a magnification of 3000 times. Oodiniumocellatum is similar to OodiniumPillularis, which causes freshwater villous disease, but tends to invade the epithelium of the Gill rather than the body of the fish in the early stages. When the parasite matures, it falls to the bottom and forms cysts. The rupture of the cyst releases free-swimming lumbar spores, which can live for 72 hours before being attached to a suitable parasitic fish. The disease is most prevalent in tropical marine fish when the temperature is between 20 and 25 ℃.
The recommended treatment with specific drugs containing various copper compounds is very effective, especially in the absence of a copper-absorbing coral bed filter medium. Unfortunately, copper is particularly toxic to invertebrates. Use new antiparasite treatments as substitutes, but check the instructions carefully, as most treatments are harmful to invertebrates, such as sea anemones, corals and crustaceans.
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Key points of adult fish management after autumn
After autumn, the water temperature begins to drop, and fish eat gradually, which is also the golden period for fish production and growth. Management should be strengthened. Specifically, the following points should be mastered: First, strengthen feeding. At this time, feeding should be based on concentrate, focusing on the fattening of fish at the bottom. At the same time, attention should be paid to the variety matching of concentrate and coarse feed to ensure that fish feed nutrition is full and comprehensive. Grass carp should be properly fed grass, herring should be fed snail feed, etc. Silver carp should also be properly fertilized. After autumn, the amount of fertilizer should be applied less frequently, and inorganic fertilizer should be the main fertilizer.
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Spawning technology of parent fish of cultured turbot
Turbot is found in coastal waters from the Mediterranean to Norway. Turbot is a valuable farmed fish in Europe. Turbot culture has developed continuously in the past 10 years. The production of turbot culture increased from 150t in 1985 to 3700 t in 1998. In the Atlantic coastal waters, turbot reproduces naturally in summer, but it may reproduce all year round by artificially controlling the light cycle and water temperature, or only by controlling the light cycle. Turbot spawned in batches and spawned as many as 10 times during the breeding period. Under the conditions of reception
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