Tis preveat report ives av iictie data through 1958 including a reeveiuation of 1354-55 counts upon which UWFL-~42:43 reported, but using ash welsnt as well as wet welent, with a modification of results, and 2 comparisoa of ictivit, yielded by fine-meshn as con- tretec with coarse-mesh plankton nets. Tne rate of physical decay chunae ; rere in te reed of earl, s.mples is comnsred with the rate ofdecline ,of successive fumpliags at inter dates, inal up to more tnan four years after the orig- fullout. fetnodas Methods of collecting and protessing of the 1954-1355 materials are Geservibed in UNFL-42:32 and UWFL-43:44,. In 1956 and 1957, col- lectins differed from that of rrevicus years in that amphibious air eraft or vubber boavus were usec for towing the neta. Methods of orocecsins were uachanrced. In 19353, planxton tows were made with 1/2-meter nylon nets of 7C-30 mesnes per ineh by towing from an LSVP (March) or 2 DUKY (August) for fro: 1 to 30 minvites during daylignzt, it a velocity of 2h =5 miles per hour ind witain 3 (usually 1-2) miles of the localities indicate:d in “able 2, In Aupuss if5e, only, plankton wa3 also collected from the Se-ip-swt wes — “Alovo" by ineans of pumping wnich not only permitted a more precise measurement of volume of sea water filtered, and vin-pointing of location of the sampiias station chan is vossible with tows, allowed simultaneous samolins of tne LSA lLasoon-bottom materlal. eo but also Thus, 97. j DOSARCHIVES é