How do mussel provenance and spat size affect mussel aquaculture performance in the South-Western Mediterranean (Algeria)?

The objective of this research was to study the effects size and spat origin farmed Mytilus galloprovinciallis in mussel longlines east Bou-Ismail Bay (central coastal Algeria, south-western Mediterranean). conducted from October 2017 July 2020 Bay. were obtained four sites (Tlemcen, Tenes, Ain Tagourait site) seeded on three sizes (10–30, 30–60 >60 mm). production performance species analysed 284 random plots using average physical product (APP), gain loss rates, condition index (CI), percentage edibility (PE) shell thickness (STI). Apart CI rate, indicators showed significant differences according source (p < 0.05). Overall, highest APP (4.3) recorded for small mussels (10–30) mm those originating Tlemcen, near finfish cages (APP = 4.14). These individuals exhibited more efficient growth physiology commercial performed better than collected at site. results can be considered a valid contribution best farming practice optimising Algeria. It also contributes development integrated multitrophic aquaculture (IMTA) methodology, which is suitable use oligotrophic Western Mediterranean.