| 1 |
|
AFSC FIT Pacific cod tagging data from the Bering Sea, 2002-2006
|
Data from opportunistic tagging studies in the southest Bering Sea 2002-2003. Individually
numbered loop spaghetti tags released during research cruises; all recoveries from
fishing industry. Main release groups in February 2003 at two locations: 1) N of
Cape Sarichef, Unimak Island, and 2) off Amak Island, north of the Alaska peninsula.
Other smaller releases at several locations in southeat Bering Sea from April 2002
to November 2003. Pacific cod (Gadus macrocephalus) caught with commercial and research
pot gear from depths of 50-150 meters; length of tagged fish primarily 50-80 cm.
Data in MS Access format (digital tabular). Data include lat/long of capture and
release locations, release date/time, fish length and condition at release. Recovery
data includes location and date of recovery, recovering vessel and gear, fishery
observer, recipient for tag reward. Most recovery locations in lat/lon to nearest
minute, some to state or federal stat area only; variables code quality of recovery
location and date info. Most records include length, weight, sex, and condition of
recovered fish, some otoliths collected. Recoveries primarily documented by fishery
observers on vessel or at delivery plant. Database includes tags recovered through
Dec 2007. Total of 6871 tags released, 2634 tags recovered. Important caveats: 1)
tags released opportunistically, not in design or associated with quantitative model,
2) most tage releases were in main commercial fishing ground during fishing season,
assumptions of mixing with overall population are invalid, 3) all recoveries through
industry, spatial and temporal distribution of recovery effort very non-uniform, some
areas little or no effort. Raw data including coordinates of tag recoveries and vessel
information are considered observer data and are confidential under the Magnuson-Stevens
Act.
|