TABLE 4.

Tetracycline resistance gene and general characteristics^a of the tetracycline-resistant strains

Strain(s)	Fish farm	Origin	Gene type(s)b	Metabolism	Oxidase	Motility	Catalase
TA5, TA45	A	Flesh	B	F	+	+	+
TA49, TA51	A	Rectum	B	F	+	+	+
TB61	B	Rectum	B	F	+	+	+
TC16-23, TC65, TC74	C	Rectum	B	F	+	+	+
TC26-31, TC35-38	C	Flesh	B	F	+	+	+
TC68, TC71, TC76	C	Skin	B	F	+	+	+
TC69	C	Flesh	B	O	+	+	+
TC33, TC34	C	Flesh	B, Y	F	+	+	+
TC32	C	Flesh	Y	F	+	+	+
TC75	C	Skin	Y	F	+	+	+
TC72, TC73	C	Flesh	Y		+	−	+
TA3	A	Skin	D	F	−	+	+
TA6	A	Flesh	D	F	−	+	+
TA55	A	Skin	D	O	+	+	+
TC67	C	Rectum	D	F	−	+	+
TA58	A	Flesh	C	O	+	−	+
TA59	A	Flesh	C	O	−	+	+
TA80	A	Flesh	C	NO	+	+	+
TA57	A	Flesh	C, G	O	−	+	+

^a+, positive; −, negative; F, fermentative; O, oxidative; NO, no growth.

^bB, tetB; Y, tetY; D, tetD; C, tetC; G, tetG.