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