Comparative growth of Mytilus chilensis (Hupé 1854) and Mytilus galloprovincialis (Lamarck 1819) in aquaculture longline system in Chile.

Choosing an alternative species of mussel for the aquaculture industries, will be possible if it has equal or greater yield than the mussel cultivated. This study compares the growth of the chilean native mussel Mytilus chilensis with the non-native Mediterranean mussel Mytilus galloprovincialis and evaluate if environmental variables and cultivation depth affects mussels growth. Mussel were seeded in summer, with the same mean total weight and shell length for both species. At the end of the experiment, shell length (SL), condition index and gonadosomatic index were compared over month, depth and species. Highly significant differences were found in shell length between month and depth and between month and species (p < 0.05). The linear relationship between the gonad weight and wet meat weight in M. chilensis present a higher gonad weight for the same wet meat weight than M. galloprovincialis. It can be concluded that at the end of the harvest size cultivation M. chilensis presents a greater gonad weight, condition index and gonadosomatic index. • Growth were compared at aquaculture system between Mytilus chilensis and Mytilus galloprovincialis • No differences were found for shell length between species • Gonad weight, condition index and wet meat weight was found higher in the native mussel than non-native. [ABSTRACT FROM AUTHOR]