Study of the effect of oral troxerutin on resistance against Ichthyophthirius multifilis in goldfish (Carassius auratus)

Document Type : Research Paper

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Abstract

Troxerutin (C33H42O19), known as vitamin P4, is a tri-hydroxyethylated derivative of natural bioflavonoid rutin. In the previous studies, the beneficial effects of troxerutin in enhancing the growth performance, physiological and immunological indices were proved. This study was designed to evaluate the effect of troxerutin on resistance against the exoparasite Ichthyophthirius multifilis in goldfish. Fish with mean weight 2.74±0.08 g were distributed in eight glass tanks and four experimental groups, including one control group and three treatment groups. During the feeding trail, fish were fed on diets supplemented with different levels of 0, 0.1, 0.3 and 0.5 g kg-1 troxerutin for 80 days. At the end of the trial, fish were exposed to theronts stage of I. multifilis at 4,000 theronts per fish. Results showed that different signs, including hyperemia and fin erosions, were prominent in the control group in comparison with the treated fish. Total numbers of parasite trophonts were also significantly decreased in the fish treated with 0.3 and 0.5 g kg-1 troxerutin compared to the control fish. These data indicated a positive effect of dietary troxerutin on disease resistance against exoparasite Ichthyophthirius multifilis in goldfish.

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Iranian Scientific Fisheries Journal
Volume 30, Issue 4
November and December 2021
Pages 95-105

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