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Differences in the digestive biochemistry between the intertidal clam, Ruditapes decussatus, and the subtidal clam, Venerupis pullastra
Albentosa, M.; Moyano, F.J. (2009). Differences in the digestive biochemistry between the intertidal clam, Ruditapes decussatus, and the subtidal clam, Venerupis pullastra. Aquacult. Int. 17(3): 273-282
In: Aquaculture International. Springer: London. ISSN 0967-6120, more
Peer reviewed article

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Keywords
    Carbohydrases; Clams; Protease; Marine

Authors  Top 
  • Albentosa, M.
  • Moyano, F.J.

Abstract
    The present study was aimed to evaluate differences in physicochemicalcharacteristics (pH and temperature optima) of the main digestive enzymes (amylase,cellulase, laminarinase, and protease) in two commercially important bivalves, the intertidalclam, Ruditapes decussatus, and the subtidal clam, Venerupis pullastra, as well toassess individual variability of such activities. The assays were performed on extractsobtained from the digestive glands and crystalline styles of individuals collected in the wildand laboratory-conditioned during 1 week. In both species, maximum activity for amylaseand cellulase was measured at pH 6 and that of laminarinase at pH 5.5, while pH profilesof protease activity showed important differences between them. Temperature profiles alsoshowed interspecific variations, mainly in laminarinase. Carbohydrase activities werecomparatively much higher in R. decussatus and proteolytic activities in V. pullastra. Theobserved differences both in physicochemical characteristics and relative importance ofdigestive enzymes are discussed in relation to the amount and type of food available intheir respective habitats.

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