1998
DOI: 10.2989/025776198784126746
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The diurnal vertical dynamics of Cape hake and their potential prey

Abstract: The Cape hakes Merluccius capensis and M. paradoxus are dominant predators over the Namibian shelf. They are found in a water column that includes myctophids and other mesopelagic fish, euphausiids and cephalopods. Together with their cohabitant potential prey, hake are known to undertake diurnal vertical migrations, aggregating near the bottom during daylight, but migrating off the bottom at night. An attempt to determine the underlying mechanisms of mis diurnal migration by means of underwater acoustics and … Show more

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Cited by 18 publications
(22 citation statements)
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“…In the morning, pelagic hake are not yet on the bottom and available to the trawl. In the early afternoon, they have already left the bottom (Huse et al 1998). The acoustic recordings were also low at those hours of the day owing to the aspect angle articulation of the fish during vertical migration, resulting in a substantially lower TS of the fish (Nakken andOlsen 1977, Huse andOna 1996).…”
Section: Discussionmentioning
confidence: 99%
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“…In the morning, pelagic hake are not yet on the bottom and available to the trawl. In the early afternoon, they have already left the bottom (Huse et al 1998). The acoustic recordings were also low at those hours of the day owing to the aspect angle articulation of the fish during vertical migration, resulting in a substantially lower TS of the fish (Nakken andOlsen 1977, Huse andOna 1996).…”
Section: Discussionmentioning
confidence: 99%
“…It would, however, potentially improve the interannual stability of such indices if they could be compensated for in terms of time of day, given that a basis for such corrections could be established. It would also be useful to determine whether such corrections should be based on in situ illumination rather than on time of day, because the variation in catchability is related to the fact that hake migrate diurnally (Huse et al 1998). In many fish species, the latter is, of course, itself probably related to in situ illumination (Neilson andPerry 1990, Helfman 1993).…”
Section: Huse Et Al: Catchability Constant For Hake In Namibian Trawmentioning
confidence: 99%
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“…However, based on the occurrence of demersal fish in the night-time diet of hake, Pillar and Barange (1997) showed evidence to suggest that large hake move lesser distances into mid water in search of food than do small hake. Based on bottom and midwater trawling and acoustic observations on hake from the South African west coast (Barange et al 1994, Pillar andBarange 1995) and off Namibia (Huse et al 1998), it appears that larger hake do not migrate extensively off the bottom at night. Therefore, it would be adaptive for horse mackerel to move towards the surface at night to avoid large hake.…”
Section: Discussionmentioning
confidence: 99%
“…The main cue for the behaviour is thought to be light (Verwey 1966), but the causal mechanism is considered to be, among others, predatory avoidance (Gabriel and Thomas 1988). DVM has evolved independently among pelagic taxa, and is seen in all major groups, from photosynthetic micro-algae (Pitcher et al 1998) to fish (Huse et al 1998). The minutiae of DVM (precise depths of occupation, duration of occupancy, etc.)…”
mentioning
confidence: 99%