Streptococcal disease
Pathogen: Streptococcus.
Symptoms: The diseased fish have prominent, whitish eyes, and the symptoms of the unilateral eye are usually obvious. Severe eyes have redness around the eyes. Dissect sick fish, liver and spleen spotting.
Popularity: The cement pond raises the true eel, the calyx pepper pupae, and the fish are susceptible to the disease. Visible throughout the year.
Prevention: Antibiotic baits are administered and 80 mg to 100 mg of body weight per kilogram of fish are administered daily for 5 days to 7 days.
Vibriosis
Pathogens: Vibrio anguillarum, Vibrio parahaemolyticus, Vibrio vulnificus, etc.
Symptoms: At the initial stage of infection, the body color appears plaque discoloration, loss of appetite, and slowly floating on the surface of the water. In the later stages of infection, epidermal hemorrhagic ulcers, scales fall off, and the snout and fin membranes may rotten to the bone.
Popularity: Various species of farmed fish have been found, mainly occurring in the spring and autumn seasons with water temperatures of 16°C to 25°C. The fish with weak constitution or the fish with surface damage are easy to infect. Chrysanthemum orientalis, large yellow croaker, and carp are susceptible to this disease.
Prevention: Sulfa drugs are baited, 30 mg to 50 mg per kilogram of body weight per day for 5 days to 7 days. Antibiotic baits, such as oxytetracycline (off-season ≥30 days), are used daily for 50 mg to 80 mg per kilogram of fish body weight for 3 days to 5 days.
Bacterial enteritis
Pathogen: Pseudomonas intestinalis.
Symptoms: Ill swollen anal of the diseased fish, abdominal swelling, squeezing the abdomen, yellow liquid flow out of the anus. In severe cases, the gastric sac is particularly swollen and protrudes from the body. Diseased fish often face up, floating on the surface of the water, not feeding.
Popularity: It is popular in summer when the water temperature is high, which is mainly related to the decline of feed quality. During the hot season, the fish eat bad food, often prone to outbreak of enteritis.
Prevention: to prevent the main, strictly control the quality of food, do not feed modified food; feeding antibiotic baits, daily medication per kilogram of body weight 10 mg to 30 mg, for 5 days to 7 days, 1 week after another feeding If the patient is seriously ill and cannot feed, he should remove it in time.
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