Observations on surface-shoaling Cape hake off South West Africa

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Abstract
An unusual occurrence of surface-shoaling Cape hake, in association with extensive swarms of Nyctiphanes capensis, was located off South West Africa in November 1971 by a night-flying research aircraft, and sampled by a research purse-seiner. Synchronous airborne radiation thermometry and a hydrobiological cruise enabled the occurrence to be explained in terms of the vertical and horizontal distribution of dissolved oxygen content during upwelling conditions inducing a temporary midwater swimming habit in the fish, coupled with a fortuitous location of the euphausiid swarms. It is suggested that the fish followed the diurnal vertical migration of the euphausiids to the surface for feeding purposes.

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