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Use of encapsulated live microalgae to investigate pre-ingestive selection in the oyster Crassostrea gigas
 

Summary: Use of encapsulated live microalgae to investigate pre-ingestive
selection in the oyster Crassostrea gigas
Emmanuelle Pales Espinosa a
, Laurent Barillé b
, Bassem Allam c,
a
NewYork State Department of Environmental Conservation, 205 Belle Meade road, East Setauket, NY 11733, USA
b
Laboratoire de Biologie Marine, ISOmer, Faculté des Sciences et des Techniques,2, Rue de la Houssinière, 44322 Nantes Cedex 3, France
c
Marine Sciences Research Center, Stony Brook University, Stony Brook, NY 11794-5000, USA
Received 26 May 2006; received in revised form 20 November 2006; accepted 8 December 2006
Abstract
The involvement of algal chemical cues in the pre-ingestive selection of food particles in Crassostrea gigas was studied using a
new approach. Live cells of two microalgal species, Nitzschia closterium and Tetraselmis suesica, were separately entrapped in
small alginate microcapsules using an emulsification/internal gelation method. Microcapsule size was adjusted to be within the
range of particles ingested by oysters. Using this technique, about 80% of microcapsules had a diameter ranging from 21 to
100 m. The monitoring of entrapped algae showed that phytoplankton cells remained alive and maintained an active growth for at
least 24 days. In particle selection bioassays, adult C. gigas were fed a mixture of microcapsules containing the above algae species
as well as control empty alginate microcapsules. The comparison of the proportions of each microcapsule type in the diet and in

  

Source: Allam, Bassem - School of Marine and Atmospheric Sciences, SUNY at Stony Brook

 

Collections: Biology and Medicine; Environmental Sciences and Ecology