Population structure of the European conger Conger conger from the mid-North Atlantic Ocean inferred from bathymetric distribution, length composition and movement patterns analyses

Information about the population structure of Conger conger (L.) is scarce, being a limiting factor for fisheries assessment. To make available important baseline information and to test the hypothesis that the population in the mid-North Atlantic (Azores region) represents a fishery management unit, fishery-dependent and survey data relating to bathymetric distribution, length composition and movement patterns were examined. Fishing impacts were also evaluated using abundance and size trends over the last 25 years. The greatest abundance was in depths between 300 and 600 m. Sizes ranged from 14 to 260 cm, with larger individuals around seamounts. Tagging data showed a strong sedentary behaviour. Results combined with previous genetic and otolith studies indicated the stock in the Azores may represent a self-contained population. Abundance and size trends were stable, but the species is considered vulnerable to overfishing due to its biological characteristics. Monitoring and adequate rational resource management are of utmost importance.

Automated summary

Information on the population structure of Conger conger is limited, but the population found in the Azores region may represent a fishery management unit. The species shows highest abundance in depths between 300 and 600m, with sizes ranging from 14 to 260cm and larger individuals near seamounts. Tagging data indicates strong sedentary behavior in this population.