Notes on the biology of Nezumia sclerorhynchus and Nezumia aequalis (Gadiformes: Macrouridae) from the Algarve slope, Northeast Atlantic

Some morphological features, bathymetric distribution and diet of Nezumia sclerorhynchus (Valenciennes, 1838) and N. aequalis (Gunther, 1878) from the Portuguese south coast (Algarve slope) are described. Sagittae otoliths, the supraoccipital bone shape and other morphological features are described to help distinguishing juveniles of N. sclerorhynchus and N. aequalis. Collection depths of both species ranged from near 200 to 900 m. N. sclerorhynchus had its upper distribution limit at 500 m and N. aequalis at 600 m. From stomach contents analysis we conclude that the main prey for both species were amphipods, polychaetes and ophiurids. Secondary prey were isopods, mysids and copepods. Prey representing other systematic groups were part of the diet of Nezumia but insignificant in both number and weight.