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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 physicochemical
    characteristics (pH and temperature optima) of the main digestive enzymes (amylase,
    cellulase, laminarinase, and protease) in two commercially important bivalves, the intertidal
    clam, Ruditapes decussatus, and the subtidal clam, Venerupis pullastra, as well to
    assess individual variability of such activities. The assays were performed on extracts
    obtained from the digestive glands and crystalline styles of individuals collected in the wild
    and laboratory-conditioned during 1 week. In both species, maximum activity for amylase
    and cellulase was measured at pH 6 and that of laminarinase at pH 5.5, while pH profiles
    of protease activity showed important differences between them. Temperature profiles also
    showed interspecific variations, mainly in laminarinase. Carbohydrase activities were
    comparatively much higher in R. decussatus and proteolytic activities in V. pullastra. The
    observed differences both in physicochemical characteristics and relative importance of
    digestive enzymes are discussed in relation to the amount and type of food available in
    their respective habitats.

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