| Abstract
| - Fisheries and Plankton Acoustics, ICES Marine Science Symposia Vol. 202 Application of dual-beam and split-beam target tracking in fisheries acoustics J. E. Ehrenberg and T. T. Torkelson The authors regret that the following mistakes were made: Page 330, Figure 1. The dB values on the x axis of Figure 1, parts (a) and (b), should be moved 5 dB to the left. The scale should therefore start at −10 dB and end at −45 dB, with no change in position of the bars representing relative frequency. Page 330, paragraph 2. Sentence two should read: The data were collected using a fixed-location, side-looking 200 kHz split-beam acoustic system operating on the Kenai River, Alaska during the 1994 summer chinook salmon (Oncorhynchus tshawytscha) migration. Page 333, top of page. Sentence two should read: This figure shows the distribution of vertical beam angles of upstream and downstream fish (primarily chum salmon, O. keta) as they… Sentence four should read: About 4% of the tracked targets at this location… Page 333, paragraph 1. Sentence two should read: The speed is determined by first using the angular estimates to determine the three-dimensional distances travelled between successive echoes. Sentence three should read: The speed is determined by dividing the total distance travelled by the time in the beam. Page 333, Acknowledgements. This section should read: The authors wish to thank the following agencies and individuals for allowing us to include example data sets from their ongoing fish monitoring projects: Debby Burwen, Alaska Dept of Fish and Game, AK (Kenai River data example), Dave Daum and Bruce Osborne of US Fish and Wildlife Service, AK (Chandalar River data example).
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