Salmon otoliths - hatchery thermal marks from F/V Great Pacific, R/V Miller Freeman multiple cruises in the Coastal Gulf of Alaska, NE Pacific from 2001-2004 (NEP project)

Salmon otoliths - hatchery thermal marks from F/V Great Pacific, R/V Miller Freeman multiple cruises in the Coastal Gulf of Alaska, NE Pacific from 2001-2004

zooplankton distributions.Analysis of salmon otoliths for hatchery thermal marks and Genetic Stock Identification techniques will be used to determine the home stream of hatchery and wild stocks in the Gulf of Alaska and their distribution with respect to oceanographic regimes.
Retrospective analysis of catch per unit effort versus oceanographic and prey factors will reveal what affects the distribution of pink, chum, coho and sockeye salmon in the study region.
Proxies for bio-physical factors will be developed and compared with salmon-run size."(projectproposal)

Data Collection Details
Types: CTD profiles, ADCP profiles of ocean current, juvenile salmonid catch statistics from trawls, salmonid stomach samples analyzed for diet composition, salmonid otolith analyses, Genetic Stock Identification, zooplankton distributions from bongo-net hauls.
Platform: Chartered fishing vessel Spatial extent: 10 transects perpendicular to the coast between Yakutat Bay and Kodiak Island Temporal extent: ~2 weeks each July-August of 2001-2004.

Acquisition Description
Fish samples were collected with a 198-m-long mid-water rope trawl with hexagonal mesh wings and body, and a 1.2-cm mesh liner in the codend (Fig. 2, Table 1).The rope trawl was towed at 3.5 to 5 kt, at or near surface, and had a typical spread of 40-m horizontally and 14-m vertically.All tows lasted 30 minutes and covered 1.5 to 2.8 nautical miles.All fish sampling was done during daylight hours.Sometimes this meant that salmon trawls preceded CTD casts.For reference, sunrise occurred at 06:04 ADT and sunset at 22:27 ADT on 1 August 2003 at 58o N. Alaska Daylight Time (ADT) is 8 hours earlier than Greenwich Mean Time (GMT).

Processing Description
Salmon and other fishes were sorted by species and counted.Standard biological measurements including fork length, body weight and sex.Scale samples from a preferred area (to document age and growth) were taken from subsamples of all salmon species.Subsamples of juvenile pink (Oncorhynchus gorbuscha), chum (O.keta), and sockeye (O.nerka) salmon were frozen whole for laboratory analyses of food habits, otolith hatchery thermal marks (pink and chum salmon), and genetic analysis (chum salmon).Tissues and otoliths were also saved from immature and maturing chum salmon to determine stock distribution and migration of these salmon.All other fish species were counted; juvenile rockfish (Sebastes spp.) and sablefish (Anoplopoma fimbria) were frozen whole for laboratory analyses.
[ table of contents | back to top ] Metadata is edited to reflect this information gleaned from the event log and the cruise report.The cruise report starts with a transit, not the science.Leg 1 includes the 11-16 July 2002 transit from Dutch Harbor to Yakutat where science personnel and gear were picked up.The Leg ends on 27 July in Seward.Chief Scientist was Edward D. Cokelet.Leg 2 departed Seward on 28 July and arrived in Dutch Harbor on 8 August with Christine Kondzela as Chief Scientist.Description 23 May 2011, dld -This cruise consisted of Leg 1 and Leg 2. Metadata is edited to reflect this information gleaned from the event log and the cruise report.Leg 1 departed Dutch Harbor.The Leg ended in Kodiak.Chief Scientist was Jamal H. Moss.Leg 2 departed Kodiak and arrived in Dutch Harbor.Chief Scientist was Edward D. Cokelet.
nets have very large front openings to herd schooling fish toward the back end where they become trapped in the narrow "broiler".The sides of the deployed net are spread horizontally with two large metal foils, called "doors," positioned in front of the net.As the trawler moves forward, the doors, and therefore the net, are forced outward, keeping the net open.This instrument designation is used when specific make and model are not known.[table of contents | back to top ] [ table of contents | back to top ]