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Page 32INRA (French National Institute for Agricultural Research)UR 1067, Nutrition, Metabolism & Aquaculture Unit, PôleHydrobiologie, 64310 St-Pée-sur-Nivelle, France.CONTACTS:“Frédéric ValleeINRA St Pée Infrastructure isChristine Burela unique set of installationsdevoted to nutrition research inwebsitefreshwater salmonids. The researchunit is internationally-recognized infish nutrition and metabolism, much involved in joint research activities with partnersfrom both private and public sectors.The facilities include three platforms, two full scale experimental fish farms with flowthrough raceways supplied with water at constant water temperature (8 and 17°C) andone specialized, original dedicated facility for fish nutrition research under controlled recirculatedwater systems that allows feeding behaviour studies and digestibility measurements.These facilities thus enable fish nutrition research work all through the lifecycle from larvae to broodstock.
Page 33AQUAFEEDThe Experimental fish farm at Donzacqhas a complete feed manufacturingplant with a twin-screw extruder.There are also wet lab facilitiesfor in vivo work as well as samplings.The water supply is fromnatural springs at a constant 17°Cwith oxygenation and gas desaturation.The farm has large (160 cubicmeters) and small scale (5000 and200L) flow through raceways and individualtanks of different sizes: 20small tanks of 50L for hatchlings, 481m² tanks, 18 2m² tanks, the latter potentially attached to computer controlled eaterfeeders.At the experimental fish farm at Lees Athas, a constant water temperature of 7°C enablesnutrition studies on cold water salmonids.. The facility comprises of 11 flow through racewaysenabling studies on more than 400 groups of eggs until hatching; a UV-treated thermoregulatedsystem for the production of eggs and fry; 84 self-cleaning tanks for growingjuvenile salmonids, of special interest for studies on nutrient-genotype interactions, 16tanks of 200L, 32 tanks of 500L; 6 concrete out-door circular ponds, 8 raceways of 12 to20m3 for studies with broodstock nutrition.Specialized facilitiesControl of Feed intake and feeding rhythms: A set of 2 independent recirculated systemseach with 12 tanks, each of which is equipped with an eater-meter device specially developedby the research team allows (i) monitoring activity and feeding rhythms, (ii) controlfeed distribution over the daily cycle and (iii) evaluation of the amount of feed distributed.Each tank being equipped with fecal collectors, accurate knowledge on feed intake by fishis gathered over long periods. Adapted with more than one feeder, the setup also enablesone to discriminate feed choice by fish.Digestibility: In a re-circulated temperature-controlled system, the system consists of 3series of 6 cylindro-conical tanks connected with a continuous automatic fecal collector.The set up originally developed by the research unit has been recognised as the mostvalid method for in vivo studies on digestibility measurements with fish. This makes possibleevaluation of apparent digestibility coefficients (ADC) of both diets and feed ingredientsand a Quality-control system has been developed for ensuring the validity of standardisedprotocols and methods. In the context of nutrition related environmental impactsof aquaculture, this allows the estimation of suspended matter loss of dietary origin. ”
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