West Coast Hake Biomass Survey on the Africana Voyage 100, February 1992

The West Coast Hake Biomass Survey was conducted on the Africana Voyage 100 from 06 February to 03 March 1992. The objectives of the cruise were to survey by means of bottom trawling the abundance of hake and other demersal species on the West Coast of South Africa; to investigate the environmental and ecological interrelationships of hake and other demersal species; to study the biology of chondrichthyan species; to investigate zooplankton scattering layers and their influence on the feeding behaviour and distribution of small hake; to investigate the feasibility of using carbon and nitrogen isotopes for tracing hake diet; to obtain coverage of chlorophyll-fluorescence distribution at the sea surface as part of an on going monitoring program; to investigate aspects of the feeding, dynamics and reproduction of zooplankton; to obtain information on the hydrology and currents on the West Coast; and to investigate vertical and horizontal distribution of hake south west of Cape Point using midwater trawling.

1992年2月6日至3月3日，在Africana航行100号航次中实施了西海岸鲽鱼生物量调查。此次航次的目的是通过底拖网的方式，对南非西海岸鲽鱼及其他底栖物种的丰度进行普查；探究鲽鱼及其他底栖物种的环境与生态相互关系；研究软骨鱼类物种的生物学特性；调查浮游动物散射层及其对小型鲽鱼摄食行为和分布的影响；研究利用碳和氮同位素追踪鲽鱼食性的可行性；作为持续监测计划的一部分，获取海面叶绿素荧光分布情况；探究浮游动物摄食、动态和繁殖的各个方面；获取南非西海岸水文和洋流信息；以及通过中层拖网研究鲽鱼在好望角西南部的垂直和水平分布。