[Different shell development in Mytilus galloprovincialis in 2 different populations from the Gulf of Naples]

The size frequency distribution, the shell weight, the semilogarythmic growth, the carbonic anhydrase activity has been investigated between two populations of mussels from different sampling zones. Significative differences were found in the parameters investigated between the two populations. The authors conclude that the reason of this morphological and biochemical differences may arise from different natural hydrobiological factors and/or from different pollution of their habitat.