The Billfish Angler Survey provides estimates of billfish angling activities in the Pacific and Indian Oceans. This collection of recreational billfish catch and effort has occurred annually since 1969 and provides an index of fishing success in many Pacific billfish destinations. Catch per unit of effort (CPUE) is measured in catch of billfish per angler fishing day. This measure of angler success, tracked over time, can indicate changes in stock size caused by over fishing, changing environmental conditions, or local economic and political events. Only a small proportion of the data are from anglers in the Indian Ocean.
The SWFSC's constituent-based Billfish Tagging Program began in 1963 and since that time has provided conventional spaghetti type tags and tagging supplies to billfish anglers fishing in the Pacific Ocean. Tag releases are recorded by anglers or vessel captains on tag release cards and mailed in. Tag recaptures are reported by phone or email. Release and recapture data are used to examine movement and migration, and species distribution patterns. This volunteer tagging program depends on the participation and cooperation of recreational anglers, sport fishing organizations, and commercial fishers. Since inception, over 55,000 billfish releases have been reported. Our emphasis continues to focus only on the skillful tagging of all billfish. The tagging of any other sport fish is not encouraged by this program; however, data from other species tagged over the years for special research projects are reported. Some tags from this program have been released in the Atlantic and Indian Ocean but these occurrences are infrequent.
Collect continuous measurements of ship’s position, sea surface temperature, salinity, turbidity, fluorescence, air temperature, barometric pressure, relative humidity, and wind speed and direction. Actual data collected any given year varies as dependent on funding availability for resources, staffing and sea days
The integrated modeling framework for Antarctic krill (Euphausia superba) has been extended to include estimates of krill growth consistent with survey data and to use multi-nation survey data collected from 1981 to 2014 near the Antarctic Peninsula. Four models of the population dynamics of Antarctic krill in Subarea 48.1 based on different aggregations of the data are described to illustrate the capabilities of the framework.
Calibrated, integrated, and averaged acoustics data, including estimates of krill (Euphausia superba) biomass density, collected around Elephant Island, the South Shetland Islands, and the Antarctic Peninsula by the U.S. AMLR Program. Data are integrated over depths from about 10-15m down to the bottom or 250m (whichever is shallower) and averaged over 1-nmi intervals.
At-sea distribution and density of marine mammals and seabirds. Seabird and marine mammal observations were collected from research vessels during transits between stations, to and from port of calls, etc.
An integrated, age-structured model was fitted to different combinations of survey data using two forms of selectivity (logistic or double-logistic) with time-constant or annually varying selectivity to investigate the population dynamics of Antarctic krill (Euphausia superba) near the Antarctic Peninsula. The
data were from surveys conducted by the U.S. Antarctic Marine Living Resources Program around the South Shetland Islands from 1992 to 2011. Two indices of krill biomass based on (1) trawl-net samples and (2) hydroacoustic sampling were combined with length-compositions from the nets. Sixteen model
configurations using different combinations of the two biomass surveys with the various options for modeling selectivities were examined.