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A new midwater trawl for sampling discrete depth horizons

Published online by Cambridge University Press:  11 May 2009

Malcolm R. Clarke
Affiliation:
National Institute of Oceanography, Wormley, Godalming, Surrey This paper was initially submitted jointly by M. R. Clarke, A. de C. Baker, D. Bishop, R. Bowers, R. Dobson and M. Harris who all contributed materially to the content. The authorship has been restricted at the editor's request.

Extract

A new midwater trawl based on that designed by Tucker (1951) is described with details of opening and closing equipment, acoustic release gear and depth telemetering pinger. An account is given of the method used in operating the xtrawl from R.R.S. ‘Discovery’.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1969

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References

Aron, W., Raxter, N.JNoel, R. & Andrews, W., 1964. A description of a discrete depth plankton sampler with some notes on the towing behaviour of a 6-foot Isaacs-Kidd midwater trawl and ai m ring-net. Limnol. Oceanogr., Vol. 9, pp. 324–33.CrossRefGoogle Scholar
Barham, E. G., 1957. The ecology of some scattering layers in the Monterey bay area. Tech. Rep. Hopkins mar. Stn Standford Univ. No. 1.Google Scholar
, A. W. H., 1962. Quantitative multiple opening and closing plankton samplers. Deep-Sea Res., Vol. 9, pp. 144–51.Google Scholar
Currie, R. I., 1962. Net closing gear. Rapp. P.-v. Reun. Cons. perm. int. Explor. Mer, Vol. 153, pp. 4854.Google Scholar
Davies, I. E. & Barham, E. G., 1969. The Tucker opening-closing micronekton net and its performance in a study of the deep scattering layer Marine Biol, Vol. 2, pp. 127–31.Google Scholar
Foxton, P., 1963. An automatic opening-closing device for large midwater plankton nets and midwater trawls. J. mar. biol. Ass. U.K., Vol. 45, pp. 295308.CrossRefGoogle Scholar
Foxton, P., 1969. SOND Cruise 1965: biological sampling methods and procedures. J. mar. biol. Ass. U.K., Vol. 49, pp. 603620.CrossRefGoogle Scholar
Harris, M. J., 1969. Acoustic command system. In:Oceanology International ’69. London, B.P.S. Exhibitions Ltd.Google Scholar
Isaacs, J. D. & Brown, D. M., 1966. Isaacs-Brown opening, closing trawl. Rep. Scripps Instn Oceanogr., S.I.O. Ref. No. 66–18, 36 pp.Google Scholar
Kemp, S., Hardy, A. C. & Mackintosh, N. A., 1929. The ‘Discovery’ investigations: objects, equipment and methods. ‘Discovery’ Rep., Vol. 1, pp. 141232.Google Scholar
Leavitt, B. B., 1938. The quantitative vertical distribution of macrozooplankton in the Atlantic ocean basin. Biol. Bull. mar. biol. Lab., Woods Hole, Vol. 74, pp. 376–94.CrossRefGoogle Scholar
Marr, J., 1938. On the operation of large plankton nets. ‘Discovery’ Rep. Vol. 18, pp. 105–20.Google Scholar
Mcgowan, J. A. & Brown, D. M., 1966. A new opening-closing paired zooplankton net. Rep. Scripps Instn Oceanogr., S.I.O. Ref. No. 66–23, 56 pp.Google Scholar
Motoda, S., 1959. Devices of simple plankton apparatus. Mem. Fac. Fish. Hokkaido Univ. Vol. 7, No. 1/2, pp. 7394.Google Scholar
Pearcy, W. G. & Hubbard, L., 1964. A modification of the Isaacs-Kidd trawl for sampling at different depth intervals. Deep-Sea Res., Vol. 11, pp. 263–4.Google Scholar
Tucker, G. H., 1951. Relation of fishes and other organisms to the scattering of underwater sound. J. mar. Res., Vol. 10, pp. 215–38.Google Scholar
Yentsch, C. S., Grice, G. D. & Hart, A. D., 1962. Some opening-closing devices for plankton nets operated by pressure, electrical and mechanical action. Rapp.P.-v. Reun. Cons. perm. int. Explor. Mer, Vol. 153, pp. 5965.Google Scholar