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Title: Effects of a short pulse administration of Ulva rigida on innate immune response and intestinal microbiota in Sparus aurata juveniles
Authors: Abdala-Díaz, Roberto Teófilo
García-Márquez, Jorge
Rico, Rosa María
Gómez-Pinchetti, Juan Luis 
Mancera, Juan Miguel
Figueroa, Félix L.
Alarcón, Francisco Javier
Martínez-Manzanares, Eduardo
Moriñigo, Miguel Ángel
UNESCO Clasification: 241707 Algología (ficología)
310502 Piscicultura
Keywords: Immune System
Photobacterium Damselae Subsp. Piscicida
Sparus Aurata
Ulva Rigida
Issue Date: 2021
Project: AGL2017‐83370‐C3‐3‐R (Ministerio de Ciencia e Innovación)
AGL2008‐05119‐C02‐02 (Ministerio de Economía y Competitividad)
AGR01842 (Consejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía)
Journal: Aquaculture Research 
Abstract: Given the potential of algae as a new aquafeed ingredient, this study evaluated the effect of the tank-cultivated macroalgae Ulva rigida C. Agardh (Chlorophyta) on innate immune response, intestinal microbiota and their resistance against Photobacterium damselae subsp. piscicida in juvenile gilthead seabream (Sparus aurata L.) after a short pulse of administration. An algae-free diet was used as control, and an experimental diet was formulated containing 25% of U. rigida (UL-25). After 2, 7, 15 and 30 days biological samples were taken. No statistical significance (p > 0.05) was detected in respiratory burst activity. Diet UL-25 significantly enhanced alternative complement pathway activity respect to control diet from the beginning of the experiment (p < 0.05). When fish were challenged against P. damselae subsp. piscicida, UL-25-fed fish were more resistant against the pathogen than the fish fed control diet, obtaining a relative survival percentage of 54.55%. The ability of UL-25 diet to modify the intestinal microbiota was also confirmed. In conclusion, the use of a short pulse of dietary administration of 25% U. rigida in S. aurata diet modulates the immune response, intestinal microbiota and reduced the mortality rate during P. damselae subsp. piscicida infection.
ISSN: 1355-557X
DOI: 10.1111/are.15148
Source: Aquaculture Research [ISSN 1355-557X], v. 52(7), p. 3038-3051
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