West Coast Hake Biomass Survey on the Africana Voyage 050, January 1987

The objectives of the cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the the diurnal cycle of hake and other demersal species; to investigate the environment and interrelationships of hake and other demersal species; to establish the offshore limit of hake and monkfish distribution and to collect deep-water specimens of fish and cephalopods; to conduct mouth-opening experiments with transducers on each wing of the net, and to compare the mouth opening and fishing capabilities of V doors and Polyvalent doors; to study community interrelationships and assemblages and to collect data on hake and other species from the International Commission for the South-East Atlantic Fisheries (ICSEAF) Division 1.5, ie: north of the South African border.

本次巡航的目标包括：通过拖网调查成年及补充群体无须鳕的丰度；探究无须鳕及其他底层鱼类的昼夜节律；分析无须鳕与其他底层鱼类的生存环境及种间关系；确定无须鳕和安康鱼分布的离岸边界，并采集深水鱼类及头足类标本；在网具两侧翼部安装传感器开展网口张开实验，对比V型网板与多用途网板的网口张开效果及捕捞性能；研究群落间关系及群落组成，并收集来自东南大西洋渔业国际委员会（ICSEAF）1.5分区（即南非边境以北区域）的无须鳕及其他物种数据。