5 eeket ee bs -13- METHODS VITY OF \ TOLL Methods of collecting and processing of the 1954-1955 plankton are described in UWFL-42:32 and UWFL-43:44. In 1956 and 1957, col- lecting differed from that of previous years in that amphibious air craft or rubber boats were used for towing the nets. dioactivity 1 March 1, Methods of processing were unchanged. In 1958, plankton tows were made with 1/2-meter nylon nets of ‘latively 70-80 meshes per inch by towing from an LSVP (March) or a DUKW iwing in (August) for from 10 to 30 minutes at a velocity of 2-1/2 - 3 miles per n the hour during daylight, and within 3 (usually 1-2 miles of the localities collected indicated in Table 4. and lagoon In August 1958 only, plankton was also collected from the support vessel, LSM "Aloto" by means of pumping, which not only permitted a zh 1958 more precise measurement of volume of sea water filtered rted in pointing of location of the sampling station than is possible with tows, ised, with but also allowed simultaneous sampling of the lagoon-bottom material. y yielded Thus, 1 nets. ranging along the southern and eastern portions of the lagoon, both the rate of plankton and bottom material were sampled. ater dates, obtained in August 1958 at the first nine stations by personnel of the and pin- at the ten consecutively numbered stations indicated in Figure 7, Bottom samples were “Aloto" using brown soap in the depression at the lower end of the sounding lead. Small amounts of sand and other bottom material adhered 4 og wR te aie REY Vas Pe