Protective effect of in-feed specific IgM towards Yersinia ruckeri in rainbow trout.
Fish Shellfish Immunol
; 93: 934-939, 2019 Oct.
Article
em En
| MEDLINE
| ID: mdl-31404633
ABSTRACT
Tightened regulations and an environmentally friendly approaches in fish production have greatly reduced the use of antibiotics but green solutions are continuously being explored. The use of functional feed may have a potential in the aquaculture sector in securing biomass and minimizing the loss from disease. In the present study, we tested the concept that blood from the fish slaughterhouse can be used for mass purification of specific antibodies which subsequently can be used for feeding fish and thereby confer protection against diseases. IgM was purified from serum from Yersinia ruckeri vaccinated rainbow trout and an IgM sandwich ELISA was developed for quantification of rainbow trout IgM. The purified IgM was encapsulated in alginate microparticles and top-coated in fish feed. IgM re-extracted from the alginate microparticles was shown to retain high reactivity towards Y. ruckeri antigens indicating that its bioactivity remained intact after encapsulation. IgM release from the alginate microparticles was only observed at high pH (pH 8.2) and minimal at low pH, indicating protection of IgM at low pH in the fish stomach during passage. In a feeding - challenge experiment (feeding 1 week before Y. ruckeri challenge and for two weeks following challenge), a statistically non-significant 10% lower mortality was observed in the high dose (400⯵g IgM/fish/day fed over 3 weeks) group.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Yersiniose
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Imunoglobulina M
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Oncorhynchus mykiss
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Substâncias Protetoras
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Yersinia ruckeri
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Doenças dos Peixes
Limite:
Animals
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article