Table 1. Inoculation concentration and inoculation method by group

	Control	A (5 mg/fish)	B (10 mg/fish)	C (20 mg/fish)	D (10 mg/fish)
Inoculation method	×	Oral	Oral	Oral	Injection
Inoculation (CFU/mL)	×	1.23 × 105	2.46 × 105	4.92 × 105	2.46 × 105
number of eels	50	50	50	50	50
Feed name	General feed	Vaccine feed	Vaccine feed	Vaccine feed	General feed