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Titolo:
Effects of short term feeding of microalgae on the bacterial flora associated with juvenile Artemia franciscana
Autore:
Olsen, AI; Olsen, Y; Attramadal, Y; Christie, K; Birkbeck, TH; Skjermo, J; Vadstein, O;
Indirizzi:
SINTEF, Fisheries & Aquaculture, N-7465 Trondheim, Norway SINTEF Trondheim Norway N-7465 s & Aquaculture, N-7465 Trondheim, Norway Norwegian Univ Sci & Technol, Trondheim Biol Stn, N-7491 Trondheim, NorwayNorwegian Univ Sci & Technol Trondheim Norway N-7491 1 Trondheim, Norway Stolt Sea Farm AS Oye, N-4484 Oyestranda, Norway Stolt Sea Farm AS Oye Oyestranda Norway N-4484 N-4484 Oyestranda, Norway Univ Glasgow, Inst biomed & Life Sci, Div Infect & Immun, Glasgow G12 8QQ,Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland G12 8QQ gow G12 8QQ,Lanark, Scotland
Titolo Testata:
AQUACULTURE
fascicolo: 1-2, volume: 190, anno: 2000,
pagine: 11 - 25
SICI:
0044-8486(20001025)190:1-2<11:EOSTFO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARVAE HIPPOGLOSSUS-HIPPOGLOSSUS; SCOPHTHALMUS-MAXIMUS L; INTESTINAL MICROFLORA; TETRASELMIS-SUECICA; MARINE MICROALGAE; TURBOT LARVAE; CULTURE; INHIBITION; ROTIFERS; SURVIVAL;
Keywords:
Artemia franciscana; Tetraselmis sp.; Vibrio; haemolytic bacteria; relative diversity; Hippoglossus hippoglossus; Atlantic halibut; larval rearing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Olsen, AI SINTEF, Fisheries & Aquaculture, N-7465 Trondheim, Norway SINTEF Trondheim Norway N-7465 lture, N-7465 Trondheim, Norway
Citazione:
A.I. Olsen et al., "Effects of short term feeding of microalgae on the bacterial flora associated with juvenile Artemia franciscana", AQUACULTURE, 190(1-2), 2000, pp. 11-25

Abstract

Artemia franciscana cultivated for 2 days for use as feed for Atlantic halibut larvae (Hippoglossus hippoglossus L.) had high numbers of associated bacteria with high counts of presumptive vibrios (TCBS-agar) and haemolytic bacteria (blood agar). The food used for the cultivation of A. franciscana,fish meal and fish oil, is a rich substrate for proliferation of opportunistic bacteria. A procedure for incubation of 2-day-old A. franciscana with the microalga Tetraselmis sp. was used to test the hypothesis that a changein the gut bacterial flora of A. franciscana could be induced by incorporating algal cells into the diet. It was expected that this would reduce bacterial proliferation in the Artemia, and introduce new bacterial species from the algal culture resulting in a more stable and diverse flora associatedwith the animals. The standard 2-day-old A. franciscana had 24,000 +/- 10,700 colony forming units (CFU, mean +/- STD) per animal with presumptive vibrios and haemolytic bacteria constituting 58% and 10% of the total, respectively. The flora was dominated by Vibrio alginolyticus-like bacteria that constituted 34 out of 40 isolates tested. During 4-h incubation the numbersof associated bacteria were reduced, on average by 75%, with the nora lessdominated by V. alginolyticus. The relative diversity (J') of the associated bacterial flora increased from 0.17 to 0.40. A 24-h incubation to simulate first feeding conditions for halibut larvae gave further decreases in bacterial numbers associated with both treated and untreated A. franciscana. The prevalence of Vibrio was lower in these two samples, and the flora was now dominated by isolates of other genera. The relative diversity of the flora of A. franciscana increased to 0.82 and 0.63 for samples previously incubated with Tectraselmis sp, and those which were not, respectively. Data from a first feeding experiment showed that the bacterial flora of the live feed was directly transferred to the larvae. The algal component was shown to influence the numbers and composition of the associated flora of the live feed, giving A. franciscana with lower numbers of bacteria as well as a more diverse bacterial community. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 11:37:04