caa a22 4500 397551460 CHVBK 20180308164751.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0055 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0055 Assessment of adult salmon in near-surface waters of Cook Inlet, Alaska [Elektronische Daten] [K. E. Tarbox, R. E. Thorne] Important commercial fisheries occur in the marine and estuarine waters of Upper Cook Inlet in south-central Alaska as adult Pacific salmon return to spawn in their natal rivers. The most valuable harvests occur on sockeye salmon (Oncorhynchus nerka (Walbaum)) runs to the Kenai, Kasilof, and other regional rivers. Fisheries management has been based on commercial catches, acoustic counts of the fish in the rivers, and run-timing models. However, when run sizes are too low for the fishery to operate, managers require alternative information. Acoustic techniques potentially provide a fishery-independent measure of run size. However, the near-surface orientation of these fish precludes a conventional down-looking acoustic approach. Side-looking transducer orientation achieved sufficient sample coverage to provide a viable assessment. Comparisons were made between side-looking assessments and ground truth information. The detection efficiency of the side-looking system was investigated as a function of sea state and bottom depth, and three surveys were conducted for comparison with abundance data from the fisheries. The results of the three surveys indicated that the acoustic techniques are a viable alternative to the traditional fisheries-based management approach. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence acoustic survey nationallicence salmon nationallicence Alaska nationallicence Tarbox K. E. Alaska Department of Fish and Game 34828 Kalifornsky Beach Rd, Soldotna, Alaska, USA 99669. aut Thorne R. E. BioSonics, Inc. 3670 Stone Way North, Seattle, Washington, USA 98103. aut ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 397-401 1054-3139 53:2<397 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0055 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0055 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tarbox K. E. Alaska Department of Fish and Game 34828 Kalifornsky Beach Rd, Soldotna, Alaska, USA 99669 aut NATIONALLICENCE 700 1- Thorne R. E. BioSonics, Inc. 3670 Stone Way North, Seattle, Washington, USA 98103 aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 397-401 1054-3139 53:2<397 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford