The study of ectoparasites on Pangasius nasutus and Pangasius hypopthalmus

Abstract

The study on ectoparasites of Pangasius nasutus and Pangasius hypophthalmus were conducted at Pusat Pengembangan Akuakultur, Perlok, Jerantut, Pahang on the 15th August 2008 and 4 th Sept 2008. Skins and gills smears of 30 Pangasius hypophthalmus were examined for ectoparasites and the only parasite found was Trichodina sp. The mean intensity was 2850 for the gills and 25 for the skins while the prevalence was 100% for both skin and gills. As for Pangasius nasutus the study on the level of infections of Trichodina sp and Argulus sp before and after treatments was done. Besides that, the site specificity of the parasites was also determined. 13 sites were chosen based on the whole surface of the fish body of 30 Pangasius nasutus. The mean intensity was 39 for Trichodina sp before treatment and 3 after treatment while for Argulus sp, before and after treatment was 1. The results showed no significant difference of Trichodina sp infection between parts of the fish body by using Duncan multiple range tests. The infestation of parasites on Pangasius nasutus and Pangasius hypophthalmus were probably due to low dissolve oxygen level during sampling.