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Using a high-powered strobe light to increase the catch of Antarctic krill

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Abstract

Adult euphausiids are difficult to capture with the nets typically used by oceanographers due in part to avoidance of the net. A cruise of the Southern Ocean GLOBEC program (NBP0103) in April/May 2001 permitted an evaluation of the efficacy of a high-powered strobe light (150 W) mounted on a 1-m2 multiple opening/closing net and environmental sampling system (MOCNESS) in reducing net avoidance. Three horizontal tows were made in Laubeuf Fjord, Marguerite Bay (western Antarctic Peninsula, 67.89°S; 68.30 W) on 28–29 May in an area that had a high abundance of adult krill (mostly Euphausia superba, Dana and a few E. crystallorophias, Holt and Tattersall). Each tow consisted of a series of paired down and up casts through a set depth interval (e.g. 50–90 m), with each successive net (335 µm mesh) sampling both a down and up cast. The strobe light was either “on” or “off” while each net was open, and when on, the light flashed at 4-s intervals. During a tow, four of the eight nets sampled with the strobe flashing and four sampled with the strobe off, in a random sequence. Total zooplankton displacement volume was significantly higher (P<0.05), on average by a factor of ~1.5, when the strobe light was on. The increased biovolume was due to the enhanced catch (factor of ~2) of adult krill (15–60 mm length). There was no enhanced catch of smaller krill (5–15 mm length: a mixture of E. superba, E. crystallorophias, and Thysanoessa macrura, GO Sars). In addition, the average length of the large krill fraction was not changed substantially with the strobe light on. These results suggest that krill avoidance of nets can be overcome by intense strobe lighting.

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Acknowledgements

We thank M-Q. Chu and L. Gray for their work in measuring the displacement volumes and making the krill length measurements, P. Hull for identifying the krill, and M. Dennett, A. Girard, K. Fisher, M. Taylor, and J. Zelag, E. Horgan, and others in the Raytheon Technical Support group for their assistance with the MOCNESS setup and during the tows. This work was supported by NSF Office of Polar Programs grant OPP-9910307. This is contribution 10982 from the Woods Hole Oceanographic Institution and 404 from the U.S. GLOBEC program.

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  1. Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA

    P. H. Wiebe, C. J. Ashjian, S. M. Gallager, C. S. Davis, G. L. Lawson & N. J. Copley

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  1. P. H. Wiebe
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  2. C. J. Ashjian
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  3. S. M. Gallager
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  4. C. S. Davis
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  5. G. L. Lawson
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  6. N. J. Copley
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Correspondence to P. H. Wiebe.

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Communicated by J.P. Grassle, New Brunswick

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Wiebe, P.H., Ashjian, C.J., Gallager, S.M. et al. Using a high-powered strobe light to increase the catch of Antarctic krill. Marine Biology 144, 493–502 (2004). https://doi.org/10.1007/s00227-003-1228-z

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  • DOI: https://doi.org/10.1007/s00227-003-1228-z

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