zodtrawl 9900pal <DATE_RANGE dates of collection activity: 1 Nov 1999 to 3 Jan 2000 and 5 Feb to 13 Mar 2000 Measurements of the length frequency distributions and condition factor measurements of the krill populations in the Palmer Basin region yield information on seasonal changes in the demographics of the krill population (on/offshore movements) and in the physiological condition of the krill. In conjunction with the bioacoustics determinations of biomass the data characterize the abundance and size character of krill in this nearshore region throughout the season. Krill are collected for these measurements by SCUBA divers and with a net towed from a zodiac. Zodiac trawls and dive operations are conducted in the immediate Palmer area within 3.7 km of the station (Palmer grid; Waters and Smith, 1992.) This data set contains a record of dives and zodiac trawls to collect krill, and what was done with the catch. The following variables are recorded: Event, Tow or Dip net No., Location, Month, Day, Time begin (GMT), Tow duration, Julian Day, Begin.Lat °S, Begin.Long °W, End.Lat°S, End.Long°W, Water depth (z), Cloud cover (%),Wind speed (kts), Net used, Tow type (tgt = target), Wire out (m), Flow meter number, Vol water filtered (m cubed), IGR experiment number, Number of individuals frozen for chemical composition, Number of individuals measured for total length, Comments (purpose; other species in catch etc.) <DERIVED_VARIABLES The volume of water filtered during the tow is calculated with the information from a General Oceanics flowmeter. <SAMPLING_FREQUENCY The planned sampling is for weekly collections of Antarctic krill, with length frequency determinations every week, growth rate experiments every 10-14 d, condition factor determinations for AC0 krill every two weeks, and samples for chemical composition three times a season. Nets were deployed with a winch and A-frame from a Mark V zodiac, the Rubber Duke. For all zooplankton tows, a 1-m diameter, 500-µm mesh ring net with a cod end with 335 µm mesh was deployed. A targetted tow was performed when a krill school was detected with the 50 kHz furuno echosounder on board the Rubber Duke. Once the cod end was retrieved, krill to be used for live experiments were placed in several seawater-filled buckets or coolers, keeping densities as low as possible. Early in the season, krill were collected with aquarium nets through leads in the ice. <EXPERIMENTAL_DESIGN The 9900pal season had no diving operation, but krill were collected through leads in the ice with aquarium nets during the first 3 weeks in November. Not enough krill were found for the planned chemical composition samples, and only 3 sets were taken for condition factor. Post cruise, krill were scarce within the boating area. Palmer LTER, krill collections <FILE_FORMAT ascii, comma separated variables <STORAGE_LOCATION http://www.icess.ucsb.edu/lter ~lter/data/9900pal/zodtrawl/ <FILE_NAMES zodtrawl.list <PRINCIPAL_INVESTIGATORS Robin M. Ross, Langdon B. Quetin <ASSOCIATE_INVESTIGATORS none <CONTACT_PERSON Robin M. Ross, Langdon B. Quetin Marine Science Institute University of California at Santa Barbara Santa Barbara, CA 93106 robin@icess.ucsb.edu, langdon@icess.ucsb.edu <SAMPLES_COLLECTED_BY CT Shaw, D Martin, A. Altieri, L Coe <LAB_ANALYSIS_BY CT Shaw, D Martin, A. Altieri, L Coe <DATA_ENTRY_BY CT Shaw and RM Ross <DATA_ANALYSIS_BY <SUBMITTED_BY RM Ross <DATE_SUBMITTED 17 August, 2002 <DATES_UPDATED <SUPPORTING_DOCUMENTS Waters, K. J. and R. C. Smith, 1992. "Palmer LTER: A Sampling Grid for the Palmer LTER Program." Antarctic Journal of the United States 1992. <QUALITY_ASSURANCE <DATA_REQUESTED_BY Top of Form 1 Datafile Form V1.2 for describing a data file.