Prevention and control of bubble disease in cultured abalone
[clinical symptoms] the adsorption capacity of diseased abalone decreased or even lost completely, and the food intake decreased sharply or even stopped eating. The abalone body floats on the water surface, the pigment in the mouth is degenerated, and the teeth and tongue are abnormally dilated. Anatomy showed that there were bubbles in the epithelial tissue and connective tissue, bubble embolism in blood vessels, expansion of vacuoles in blood cells and swelling of viscera.
[etiology and prevalence] so far, there is no consistent view on the cause of the disease. Some researchers believe that it is due to the fact that young abalone has not yet fully adapted to artificial formula feed, resulting in the disruption of the original microbial system in the digestive tract; others believe that under the condition of strong light and poor flow of water, the disease of abalone is caused by excessive dissolved oxygen produced by fresh algae fed through photosynthesis; some researchers believe that it is pathogenic and is caused by some pathogens. The disease has occurred frequently in seedling production units in China since the late 1980s, and it is one of the most common diseases of juvenile abalone within 1-2 months after stripping. The disease mainly occurs in the high temperature season, and the incidence is low in the low temperature season. After the disease spreads quickly, the disease has a wide range of diseases and a large number of deaths, which may cause extremely serious consequences to the nursery units.
[prevention and control measures] strictly abide by the "four principles" in daily feeding, and pay attention to avoid strong light and increase water flow when ① is fed with a large number of fresh algae. If ② produces air bubbles after fermentation due to indigestion caused by artificial formula feed, as long as the air bubbles are punctured to release gas, the diseased abalone can heal slowly. In addition, you can choose to replace palatable bait. After ③ discovered the disease, the diseased abalone was transferred to fresh sea water in time and the amount of water flowing was increased.
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