Age-specific mortality and transport of larval walleye pollock Theragra chalcogramma in the western Gulf of Alaska

Sarah Hinckley, Kevin Bailey, Susan Picquele

NOAA, National Marine Fisheries Service, Alaska Fisheries Science Center, 7600 Sand Point Way NE, Seattle, Washington 98115, USA

Mary Yoklavich

NOAA, National Marine Fisheries Service, Pacific Fisheries Environmental Group, Southwest Fisheries Science Center, PO Box 831, Monterey, California 93942, USA

Phyllis Stabeno

NOAA, OAR, Pacific Marine Environmental Laboratory, 7600 Sand Point Way NE, Seattle, Washington 98115, USA

Marine Ecological Progress Series, 98, 17-29.
Copyright ©1993 Inter-Research. Further electronic distribution is not allowed.

Gallery of Figures

Fig. 1. Survey area for (a) Pass 1 and (b) Pass 2, including station locations and strata boundaries.

Fig. 2. Theragra chalcogramma. Comparison of catch at length of walleye pollock larvae averaged over all hauls from the 4 gear types.

Fig. 3. The domain of the model is shown. Distribution of larvae (a) found during Pass 1 (this is the initial condition for the model), (b) found during Pass 2, and (c) predicted by the model of advection and diffusion for the time period corresponding to Pass 2. Larval abundance contours shown are in. 10 m (solid area: >600 larvae 10 m).

Fig. 4. Theragra chalcogramma. Larval abundance for 3 d cohorts during Passes 1 and 2.

Fig. 5. Theragra chalcogramma. Distribution of the 19 April cohort during Pass 1 showing area on the northwest border of the survey area (shaded where larvae might have been missed, causing underestimation of mortality rates. Larval abundance contours shown are ind. 10 m.

Fig. 6. Theragra chalcogramma. Distribution of 10 April to 1 May cohorts during (a) Pass 1 and (b) Pass 2. Larval abundance contours shown are ind. 10 m.

Fig. 7. Theragra chalcogramma. Centroids of larval distributions in Passes 1 and 2 (May 1988), as compared with other years (figure adapted from Kendall and Picquelle 1990).

Fig. 8. Theragra chalcogramma. Boxes show the locations of the 3 main concentrations of larvae (as seen in Fig. 6a, b) and their net displacement between passes. The track of the satellite-tracked buoy is also shown.

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