Publications

Acting on Short-term Disturbance to Seals Amidst Uncertainty About Long-term Impacts and Vessel Compliance Under the U.S. Marine Mammal Protection Act. Alaska Marine Science Symposium poster.

Marine birds and mammals observed in the Yakutat salmon setnet fishery.

This report describes the preliminary conclusions of the NOAA Fisheries Biological Review Team (BRT) on the status of five species of Rockfish.

Published Date: 2009

This Environmental Impact Statement evaluates the environmental effects of measures to minimize Chinook salmon Bycatch in the Bering Sea pollock fishery.

Collaborative study about the Cook Inlet beluga whale population's decline and lack of recovery.

The goal of ESA recovery under this plan is to improve the viability of these steelhead, and the ecosystems upon which they depend, to the point that they no longer require ESA protection.

The Southeast Alaska Coastal Monitoring (SECM) project has been sampling juvenile salmon (Oncorhynchus spp.) and associated environmental parameters in northern Southeast Alaska (SEAK) since 1997 to better understand effects of environmental change on salmon production. A pragmatic application of this effort is to forecast the abundance of adult salmon returns in subsequent years. Since 2004, juvenile peak salmon catch per unit effort (CPUE) from SECM, modified by other environmental parameters as appropriate, has been used to forecast harvest of adult pink salmon (O. gorbuscha) in SEAK. The forecast of 16.1 million fish for 2008 was within 2% of the actual harvest of 15.9 million fish. This represents the fourth forecast over the period 2004-2008 which was within 11% of the actual harvest. In 2006, however, the harvest was substantially different from the forecast. Although a simple CPUE model did indicate a downturn in harvest for 2006, the forecast was nonetheless 200% higher than the actual 2006 harvest. These results show that the CPUE information has great utility for forecasting year class strength of SEAK pink salmon, but additional environmental data are needed to avoid “misses” such as the 2006 return. Since 2007, the forecast model was developed using stepwise multiple regression, jackknife hindcast analysis, and bootstrap confidence intervals. A four-parameter model was selected as the “best” forecast model for 2009. Juvenile pink salmon CPUE in northern SEAK accounted for 82% of the variability in annual harvest of SEAK pink salmon over the 1997-2008 time period. The amount of variability explained was improved to 99% when the May 20-m integrated sea water temperatures and mixed-layer depths (from the SECM strait habitat) and the El Niño Southern Oscillation (ENSO) Index were included in the four-parameter multiple regression model. The 2009 forecast from the four-parameter model, using data collected in 2008, is 44.4 million fish, with an 80% bootstrap confidence interval of 37-52 million fish. Juvenile pink salmon peak CPUE collected in southern SEAK from 2005-2007 was highly correlated (r = 0.99) with the peak CPUE from northern SEAK in those years, and was not correlated (r < 0.01) with the residuals from the forecast model. Because the pattern of juvenile abundance was similar for the two areas, no additional variation in the harvest was explained by including the southern region data. However, that time series includes only three years of data; more years may provide additional information on regional variation in pink salmon year-class strength, especially for years when the two areas have distinctly different environmental conditions.

This Biological Assessment addresses potential effects of the Alaska Railroad Corporation’s proposed Port MacKenzie Rail Extension on federally listed threatened and endangered species that are protected under the Endangered Species Act.

On August 28, 2009, the Alaska Fisheries Science Center (AFSC) completed the thirty-first annual longline survey of Alaska sablefish (Anoplopoma fimbria) and other groundfish resources of the upper continental slope (Figure 1). This survey was designed to continue the time series (1979-94) of the Gulf of Alaska portion of the Japan-U.S. cooperative longline survey that was discontinued after 1994. The National Marine Fisheries Service (NMFS) has surveyed the Gulf of Alaska annually since 1987, the eastern Aleutian Islands biennially since 1996, and the eastern Bering Sea biennially since 1997. The Gulf of Alaska and eastern Bering Sea were sampled in 2009.