Pseudocapillaria tomentosa is a pathogenic nematode parasite, causing emaciation and severe inflammatory lesions in the intestines in zebrafish Danio rerio (Hamilton 1822). Emamectin benzoate is commercially available analogue of ivermectin used for treating salmon for sea lice, under the brand name SLICE ® , and we have used this for treating zebrafish with the P. tomentosa . Here, SLICE ® , 0.2 per cent active emamectin benz...