The Prevention Techniques of Crawling Stomach Disease in Sea Cucumber Culture

The disease occurs in the later stage of the larval larvae, and it is more likely to develop in the high-temperature period from June to July each year and when the larvae are cultivated with high density. The disease has been found in Shandong and Liaoning provinces, and the incidence rate has increased year by year. The symptoms of death are mainly as follows: the larva stomach wall thickening, rough, the surrounding boundaries of the stomach become blurred, followed by atrophy becomes smaller, deformation, severe erosion of the entire stomach wall, and ultimately can cause larvae to die. The diseased larvae had decreased feeding capacity or no feeding, stunting, irregular sizes, and low metamorphosis rates from ear larvae to larvae.

The cause of the disease is on the one hand due to the poor quality of the feed, such as feed aging, sedimentation and deterioration of the monocellular algae feed, or the single feeding of the feed, such as single feed of gold algae, Platymonas, and other baits. On the other hand, some bacteria that infect larvae can also cause the disease to occur. The author has now isolated 2 strains of pathogenic bacteria, and its classification and identification are ongoing.

There are two main prevention and control measures: on the one hand, feeding fresh palatability bait, such as Chaetoceros, D. salina, or marine yeast, to meet the needs of larval development and growth; on the other hand, increase the amount of water exchange and reduce the amount of bacteria in the water. Use of furan antibiotics 3l0-6 ~ 510-6 medicinal bath has a good effect.

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