sentences:  ICSEAF Convention came into force in 1971, with the Secretariat located in Madrid, Spain and was established mainly in response to increased levels of exploitation of newly discovered rich fishing grounds off the Namibian coast by the fleet of Distant Water Fishing Nations (DWFNs).ICSEAF failed its mandate largely because Contracting Parties did not comply with the conservation and management measures they adopted and that the Commission lacked effective compliance and enforcement mechanisms.Fishing efforts increased rapidly during the 1960s and throughout the 1970s and 1980s on targeted species such as hake, horse mackerel and pilchards off Namibia and horse mackerels ("Trachurus capensis" and "T. trecae") and sardinellas (Sardinella aurita and "S. maderensis") in southern Angolan waters.