Fish Protein Hydrolysates - FPH- enhance resistance of aquaculture species to different types of...

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Aquaculture production is now exceeding fisheries production in total seafood supply. Aquaculture, through intensification and husbandry practices, generate numerous stressful events, which may result from water deterioration (acute or chronic exposure to reduced levels of dissolved oxygen and/or increased levels of carbon dioxide, ammonia, nitrite) and/or handling (vaccination, transfer, transport, grading, ambient noise).

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  • 1. March | April 2012 Feature title: Fish Protein Hydrolysates- FPH- enhance resistance of aquaculture species to different types of stress International Aquafeed is published five times a year by Perendale Publishers Ltd of the United Kingdom. All data is published in good faith, based on information received, and while every care is taken to prevent inaccuracies, the publishers accept no liability for any errors or omissions or for the consequences of action taken on the basis of information published. Copyright 2012 Perendale Publishers Ltd. All rights reserved. No part of this publication may be reproduced in any form or by any means without prior permission of the copyright owner. Printed by Perendale Publishers Ltd. ISSN: 1464-0058 The International magazine for the aquaculture feed industry

2. FEATUREFEATURE Based on this statement, any perturba-reference, coated at two percent dosagefeedingtrialimplementedwithcontrolcommer- tion of the water quality, resulting from ontoanutritionallybalancedPlantBasedFeedcialfeed,withorwithoutFPHsupplementation overfeeding, overcrowding, water renewal (PBF), within two distinct experimental facili- (twopercentdosage).SeeFigure4. shortageoralgaeblooming,mayhavecritical tiesnamedCandD. 1.0ml of a bacterial suspension consisting consequencesonhealth&growthstatusesofThese facilities, consisting in two serials in9x108UFCofAeromonashydrophilawas farmedspecies. of 24 tanks of 100l capacity supplied with injectedintothefishabdominalcavity.There Twoammoniachallengetrialwereimple-thermoregulatedandfiltratedseawater;only werefourreplicatesand15fishperreplicate mentedonTracatfish(Pangasiushypophthal- differ by their tank heights. Fish into facilities were inoculated and then monitored for mus),andNiletilapia(Oreochromisniloticus), C,duetolowertanks,aremoreexposedtoAeromonashydrophilasymptomsfor10days. Fish Protein Hydrolysates juveniles (mean weight = 13g) in order to assess the impact of FPH on overall survivaltechnicians work and visual contacts. Basedon the significant differences observed for Attheendofthisperiod,averagesurvival rate of inoculated fish for control feed was FPH- enhance resistance of aquaculturerates.average zootechnical performance indicatorsveryhigh,whichmeansthatinitialfishhealth species to different types of stressBasically, fish were fed for 10 weeks with commercial diets, formulated with different(see Figure 4), this visual disturbance stressobviouslyimpactsfishbehavior. status was really good before starting the diseasechallengetrial. levelsoffishmealFM-,supplementedornot Thus,growthoffishrearedinfacilitiesCDespite this high survival rate, FPH sup- by M Herault, V Fournier, M Hervy, A Ngoc, AquativZa Du Gohlis 56250 Elven, Francewith FPH2 and FPH3 (1.8 percent in tilapia isonlyat67percentoftheaveragepotentialplementation significantly improved overall diets & three percent in catfish diets). After growthobservedforfacilitiesD.Thisgrowth survival rates from 88 up to 98 percentA thosefeedingperiods,10tilapiaand20catfishretardation is mostly explained by a much (p