Anchovy Recruitment on the Africana Voyage 047, August 1986

The main objectives of the cruise were a direct assessment of the biomass of adult anchovy and pilchard on the South and East coasts by acoustic survey, supplemented by aerial fish spotting (East Coast only); an acoustic investigation of the distribution and behaviour of other pelagic fish of commercial importance; an investigation of the relationship between anchovy, pilchard and the hydrobiological environment, specifically water temperature and plankton distribution; a determination of the extent to which anchovy recruits penetrated onto the South Coast, as follow-up to recruit surveys on the West Coast in May and June (Voyages 44 and 45) and a study of the broad physical and chemical features of the Agulhas Bank and East Coast continental shelf in winter.

巡航的主要目标是对南、东海岸成年沙丁鱼和鳀鱼的生物量进行直接评估，通过声学调查实现，并辅以空中鱼类观察（仅限东海岸）；对其他具有商业重要性的浮游鱼类的分布和行为进行声学探测；研究沙丁鱼、鳀鱼与水文环境之间的关系，特别是水温及浮游生物分布；确定鳀鱼新鱼群渗透至南海岸的程度，此为对五月和六月（航次44和45）西海岸新鱼群调查的后续研究，并研究冬季阿古拉斯银行和东海岸大陆架的广泛物理和化学特征。