The investigated result on ectoparasites in 300 young gold lined spinefoot (Siganus guttatus) cultured in Thua Thien Hue province in 2012 showed that: 8 ectoparasites species were detected including Cryptocaryon irritans, Trichodina compacta, Vorticella sp, Zoothamniumsp, Acanthoplacatus sp., Stellantchasmus falcatus (metacercaria), Piscico/a sp and Ergasilus rotundicorpus. Of which, Trichodina compacta, Vorticella sp. and Ergasilus rotundicorpus parasitized on fish with high or very high rate and intensity, the others appeared with low rate and intensity.