Abstract
On 9 October, 1985 a daytime surface swarm of the euphausiid Euphausia lucens was observed and sampled in St. Helena Bay in the Southern Benguela region. The swarm was monospecific, consisted of adults in prebreeding condition and appeared to be feeding on detrital material. The swarm covered an estimated 46 ha, densities within it ranged between 4 000 and 1 500 000 individuals per cubic metre and the swarm was estimated to contain ∼5 000 tonnes of euphausiids. No simple explanation for the presence of the swarm was apparent.
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Aitken, J. J.: Swarming in Meganyctiphanes norvegica (M. Sars) in Strangford Lough, Co. Down. Ir. Nat. J. 13, 140–142 (1960)
Alldredge, A. L., B. H. Robison, A. Fleminger, J. J. Torres, J. M. King and W. M. Hamner: Direct sampling and in situ observation of a persistent copepod aggregation in the mesopelagic zone of the Santa Barbara Basin. Mar. Biol. 80, 75–81 (1984)
Brown, R. G. B., S. P. Barker and D. E. Gaskin: Daytime surface swarming by Meganyctiphanes norvegica off Brier Island, Bay of Fundy. Can. J. Zool. 57, 2285–2291 (1979)
Cox, S. J.: Shore stranding of Meganyctiphanes norvegica (M. Sars). Estuar. cstl mar. Sci. 3, 483–484 (1975)
Endo, Y.: Daytime surface swarming of Euphausia pacifica (Crustacea: Euphausiacea) in the Sanriku coastal waters off northeastern Japan. Mar. Biol. 79, 269–276 (1984)
Forsyth, D. C. T. and L. T. Jones: Swarming of Thysanoessa longicaudata (Kroyer) (Crustacea, Euphausiacea) in the Shetland Isles. Nature, Lond. 212, 1467–1468 (1966)
Komaki, Y.: On the surface swarming of euphausiid crustaceans. Pacif. Sci. 21, 433–448 (1967)
Marr, J. W. S.: The natural history and geography of the Antarctic krill Euphausia superba. Discovery Rep. 32, 33–464 (1962)
Mauchline, J. and L. R. Fisher: The biology of euphausiids. Adv. mar. Biol 7, 1–454 (1969)
Nicol, S.: Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy. Mar. Ecol. Prog. Ser. 18, 241–251 (1984a)
Nicol, S.: Cod end feeding by the euphausiid Meganyctiphanes norvegica. Mar. Biol. 80, 29–33 (1984b)
Nicol, S.: Shape, size and density of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy. J. Plankt. Res. 8, 29–39 (1986)
Tarazaki, M.: Surface swarms of a euphausiid Euphausia pacifica in Otuschi Bay, northern Japan. Bull. Plankt. Soc. Japan 27, 19–25 (1980)
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Communicated by O. Kinne, Oldendorf/Luhe
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Nicol, S., James, A. & Pitcher, G. A first record of daytime surface swarming by Euphausia lucens in the Southern Benguela region. Mar. Biol. 94, 7–10 (1987). https://doi.org/10.1007/BF00392893
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DOI: https://doi.org/10.1007/BF00392893