The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)

The effect of silkworm-derived polysaccharide silkrose on fish ectoparasites was investigated. When juvenile yellowtail (<i>Seriola quinqueradiata</i>) fed diets containing silkrose were artificially infected with <i>Benedenia seriolae</i>, a fish ectoparasite, the numbers of...

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Main Authors: Takeshi Miura, Munenori Nishikawa, Yuki Otsu, Muhammad Fariz Zahir Ali, Atsushi Hashizume, Chiemi Miura
Format: Article
Language:English
Published: MDPI AG 2022-01-01
Series:Fishes
Subjects:
Online Access:https://www.mdpi.com/2410-3888/7/1/14
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author Takeshi Miura
Munenori Nishikawa
Yuki Otsu
Muhammad Fariz Zahir Ali
Atsushi Hashizume
Chiemi Miura
author_facet Takeshi Miura
Munenori Nishikawa
Yuki Otsu
Muhammad Fariz Zahir Ali
Atsushi Hashizume
Chiemi Miura
author_sort Takeshi Miura
collection DOAJ
description The effect of silkworm-derived polysaccharide silkrose on fish ectoparasites was investigated. When juvenile yellowtail (<i>Seriola quinqueradiata</i>) fed diets containing silkrose were artificially infected with <i>Benedenia seriolae</i>, a fish ectoparasite, the numbers of parasitized <i>B. seriolae</i> were significantly lower compared to that in fish in the control group without silkrose treatment. Furthermore, when juvenile yellowtails were severely infected with <i>B. seriolae</i>, no mortality was observed in the silkrose-treated group, compared to more than 60% in the control group. In field studies carried out at a fish farm with yellowtail and white trevally (<i>Pseudocaranx dentex</i>), oral treatment with silkrose significantly reduced <i>B. seriolae</i> parasitism in yellowtail and <i>Caligus longipedis</i> and <i>Neobenedenia girellae</i> parasitism in white trevally. Silkrose treatment also reduced blood levels of cortisol, a stress hormone in both species. The changes in gene expression in the epidermis of yellowtail by silkrose treatment were also investigated, showing that the expression of various genes, including factors involved in immunity, stress response, and wound healing, was changed by the treatment. These findings indicate that silkworm-derived silkrose effectively prevents infection by external parasites in yellowtail and white trevally.
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spelling doaj.art-a87fb65340b241acb289b85336de33f82023-11-23T19:51:25ZengMDPI AGFishes2410-38882022-01-01711410.3390/fishes7010014The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)Takeshi Miura0Munenori Nishikawa1Yuki Otsu2Muhammad Fariz Zahir Ali3Atsushi Hashizume4Chiemi Miura5Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanGraduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanGraduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanGraduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanGraduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanDepartment of Global Environment Studies, Faculty of Environmental Studies, Hiroshima Institute of Technology, 2-1-1 Miyake, Saeki-ku, Hiroshima 731-5193, JapanThe effect of silkworm-derived polysaccharide silkrose on fish ectoparasites was investigated. When juvenile yellowtail (<i>Seriola quinqueradiata</i>) fed diets containing silkrose were artificially infected with <i>Benedenia seriolae</i>, a fish ectoparasite, the numbers of parasitized <i>B. seriolae</i> were significantly lower compared to that in fish in the control group without silkrose treatment. Furthermore, when juvenile yellowtails were severely infected with <i>B. seriolae</i>, no mortality was observed in the silkrose-treated group, compared to more than 60% in the control group. In field studies carried out at a fish farm with yellowtail and white trevally (<i>Pseudocaranx dentex</i>), oral treatment with silkrose significantly reduced <i>B. seriolae</i> parasitism in yellowtail and <i>Caligus longipedis</i> and <i>Neobenedenia girellae</i> parasitism in white trevally. Silkrose treatment also reduced blood levels of cortisol, a stress hormone in both species. The changes in gene expression in the epidermis of yellowtail by silkrose treatment were also investigated, showing that the expression of various genes, including factors involved in immunity, stress response, and wound healing, was changed by the treatment. These findings indicate that silkworm-derived silkrose effectively prevents infection by external parasites in yellowtail and white trevally.https://www.mdpi.com/2410-3888/7/1/14polysaccharideinsect for feedsilkworminnate immunityectoparasitefish culture
spellingShingle Takeshi Miura
Munenori Nishikawa
Yuki Otsu
Muhammad Fariz Zahir Ali
Atsushi Hashizume
Chiemi Miura
The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
Fishes
polysaccharide
insect for feed
silkworm
innate immunity
ectoparasite
fish culture
title The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
title_full The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
title_fullStr The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
title_full_unstemmed The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
title_short The Effects of Silkworm-Derived Polysaccharide (Silkrose) on Ectoparasitic Infestations in Yellowtail (<i>Seriola quinqueradiata</i>) and White Trevally (<i>Pseudocaranx dentex</i>)
title_sort effects of silkworm derived polysaccharide silkrose on ectoparasitic infestations in yellowtail i seriola quinqueradiata i and white trevally i pseudocaranx dentex i
topic polysaccharide
insect for feed
silkworm
innate immunity
ectoparasite
fish culture
url https://www.mdpi.com/2410-3888/7/1/14
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