Discovery reports (1929) Discovery reports discoveryreports131936inst Year: 1929 Fig. 5. Internal closing mechanism for large nets. A, open; B, closed, a, 'fishing' part of net. 6, throttling band, c, bridles, d, release gear, e, towing warp. /, stray line. parison with a series of colour standards. The net provides a swift and convenient method of comparing the relative abundance of phytoplankton in diflFerent localities, and is in daily use while the ship is at sea. In the ' Discovery 11' it has been found possible to take vertical hauls with the Young Fish Trawl (TYF), a stramin net with
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Discovery reports (1929) Discovery reports discoveryreports131936inst Year: 1929 Fig. 5. Internal closing mechanism for large nets. A, open; B, closed, a, 'fishing' part of net. 6, throttling band, c, bridles, d, release gear, e, towing warp. /, stray line. parison with a series of colour standards. The net provides a swift and convenient method of comparing the relative abundance of phytoplankton in diflFerent localities, and is in daily use while the ship is at sea. In the ' Discovery 11' it has been found possible to take vertical hauls with the Young Fish Trawl (TYF), a stramin net with the fore part of large meshed netting to facilitate sinking. The net, mounted on a stream-lined frame 2 m. in diameter, was closed by an inside throttling line (as described above), and was used over the stern of the vessel, suspended from the long derrick boom attached to the samson post. A weight of 180 lb. was employed with this net. The release gear is of a special type with 1 Harvey, F. W., Journ. Mar. Biol. Ass., n.s., .ix, p. 761 (1934); Journ. de Conseil, x, p. 179 (1935).