 The mature and spawning adult fish have only been observed in the last quarter of the year in certain locations including Madeira, the Canaries, and the northwest coast of Africa.The gonadosomatic index is higher for the same body length in the black scabbardfish located around Madeira as opposed to off mainland Portugal or to the west of the British Isles.This occurrence may be due to the areas lacking intrinsic and extrinsic factors that condition the maturity process in these areas.