U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
NOAA-NMFS-NWFSC TM-31: Data Collection -- Groundfish (cont):
Table 2.5.
Estimated percentage of
number of groundfish trawl landings represented in Washington
trawl logbook records, 1991-92.
| Number of | Number | Number | Percent | ||
| Year | Quarter | fish tickets | of landings | of logbooks | represented |
| 1991 | Jan.-Mar. | 345 | 335 | 287 | 86% |
| >Apr.-Jun. | 385 | 378 | 323 | 85% | |
| Jul.-Sep. | 394 | 385 | 318 | 83% | |
| Oct.-Dec. | 232 | 224 | 150 | 67% | |
| 1992 | Jan.-Mar. | 369 | 347 | 285 | 82% |
Apr.-Jun.
| 379 | 360 | 304 | 84% | |
| Jul.-Sep. | 413 | 388 | 338 | 87% | |
| Oct.-Dec. | 241 | 235 | 170 | 72% | |
*Determining
the actual number of landings in any given period is problematic.
The number of fish tickets is an overestimate of the actual number
of landings, since there may be several different fish tickets
for a given trip. Numbers of landings given above represent an
attempt to reconcile fish tickets against logbook records. The
number of trips recorded in trawl logbooks should provide a minimum
estimate of the number of landings, since logbook records for
some trips are never reported and some fishers log more than one
trip on a logbook page, causing the multiple trips to appear as
a single trip. The number of logbook trips reported above were
determined by counting the number of unique boat/landing date
records in the Washington Department of Fish and Wildlife trawl
logbook data files after excluding trips from Puget Sound.