A new multiple rectangular midwater trawl (RMT 1+8M) and some modifications to the institute of oceanographic sciences' RMT 1+8
- 166 Downloads
A new multiple rectangular midwater trawl (the RMT 1+8M) is described. It consists of three 1 m2 and three 8 m2 mouth area nets combined within the same frame and is based upon the Institute of Oceanographic Sciences RMT 1+8. It is acoustically operated and controlled and has been successfully used to a depth of 4500 m. The condition of the catch is excellent and use of the multiple net has resulted in considerable saving in ship's time. Some modifications to the existing RMT 1+8 are also described.
KeywordsMouth Area Considerable Saving Midwater Trawl Rectangular Midwater Trawl
Unable to display preview. Download preview PDF.
- Baker, A. de C., M.R. Clarke and M.J. Harris: The N.I.O. combination net (RMT 1+8) and further developments of rectangular midwater trawls. J. mar. biol. Ass. U.K. 53, 167–184 (1973)Google Scholar
- Clarke, M.R.: A new midwater trawl for sampling discrete depth horizons. J. mar. biol. Ass. U.K. 49, 945–960 (1969)Google Scholar
- Foxton, P.: An automatic opening-closing device for large midwater plankton nets and midwater trawls. J. mar. biol. Ass. U.K. 45, 295–308 (1963)Google Scholar
- — SOND Cruise 1965: biological sampling methods and procedures. J. mar. biol. Ass. U.K. 49, 603–620 (1969)Google Scholar
- Frost, B.W. and L.E. McCrone: Vertical distribution of zooplankton and myctophid fish at Canadian weather station P, with description of a new multiple net trawl. Proc. Inst. elect. electron. Engrs (IEEE) int. Conf. Engng Ocean Envir. 1, 159–165 (1974). (Halifax, Nova Scotia)Google Scholar
- Longhurst, A.R., A.D. Reith, R.E. Bower and D.L.R. Seibert: A new system for the collection of multiple serial plankton samples. Deep-Sea Res. 13, 213–222 (1966)Google Scholar
- — and R. Williams: Improved filtration systems for multiple-serial plankton samplers and their deployment. Deep-Sea Res. 23, 1067–1073 (1973)Google Scholar
- Merrett, N.R. and H.S.J. Roe: Patterns and selectivity in the feeding of certain mesopelagic fishes. Mar. Biol. 28, 115–126 (1974)Google Scholar
- Sameoto, D.D., L.O. Jaroszynski and W.B. Fraser: A multiple opening and closing sampler based on the MOCNESS and N.I.O. nets. J. Fish. Res. Bd Can. 34, 1230–1235 (1977)Google Scholar
- Wiebe, P.H., K.H. Burt, S.H. Boyd and A.W. Morton: A multiple opening/closing net and environmental sensing system for sampling zooplankton. J. mar. Res. 34, 313–326 (1976)Google Scholar