Why is Asari (=Manila) clam Ruditapes philippinarum fitness poor in Arcachon Bay: A meta-analysis to answer?

摘要: Asari (= Manila) clam, Ruditapes philippinarum, is the second bivalve mollusc in terms of production world and, many coastal areas, can beget important socio-economic issues. In Europe, this species was introduced after 1973. Arcachon Bay, a decade aquaculture attempt, clam rapidly constituted neo-naturalized population which now fished. However, recent studies emphasized decline and individual performances. framework national project (REPAMEP), some elements fitness, stressors responses bay were measured compared to international data (41 publications, 9 countries). The condition index (CI=flesh weight/shell weight) lowest among all sites. Variation average Chla concentration explained 30% variation CI different areas. Among potential diseases, perkinsosis particularly prevalent with high abundance, clams underwent Brown Muscle Disease, pathology strictly restricted lagoon. Overall element contamination relatively low, although arsenic, cobalt, nickel chromium displayed higher values than other ecosystems where exploited. Finally, total hemocyte count (THC) related immune system activity, exhibited that also under what generally observed elsewhere. conclusion, study, reserves due heterogeneity available data, suggest low fitness Bay poor trophic condition, prevalence intensity disease (perkinsosis), moderate inorganic contamination, efficiency system.