Some effects of marine reserve protection on the population structure of two spearfishing target-fish species, Dicentrarchus labrax (Moronidae) and Sparus aurata (Sparidae), in shallow inshore waters, along a rocky coast in the northwestern Mediterranean Sea

1. The relative abundances of two highly sought after spearfishing target-f ish species, Dicentrarchus labrax (Linnaeus 1758) and Sparus aurata Linnaeu s 1758, were compared using underwater visual censuses in shallow (< 5 m) i nshore waters along rocky shores inside and outside a marine reserve area i n the northwestern Mediterranean Sea (Banyuls-sur-Mer region, France). 2. The relative abundances of these two species were consistently lower out side the reserve area, which comprised around 40% of the 25.6 km of inshore coastal waters surveyed. 3. The demographic structure of D. labrax was also different inside and out side the protected area, the proportion of larger fish being significantly higher in the marine reserve. 4. The direct and indirect impacts of spearfishing are postulated to explai n the distributional and population structural characteristics of these two species in the shallow waters off this rocky coast. 5. Prohibition of spearfishing has favoured the persistence of these specie s during summer (the main spearfishing season) in the shallower inshore wat ers inside the area of the Cerbere/Banyuls-sur-Mer marine reserve. 6. These preliminary results indicate the need for additional work in this area and further surveys to ascertain spearfishing impacts on target-fish s pecies in the vicinity of other marine protected areas. Copyright (C) 2001 John Wiley & Sons, Ltd.