Affiliation:
1. Institute of Freshwater Research, Swedish Board of Fisheries, Stångholmsvägen 2, 178 93 Drottningholm, Sweden
2. Department of Systems Ecology, Stockholm University, 106 91 Stockholm, Sweden
Abstract
AbstractAxenrot, T., Ogonowski, M., Sandström, A., and Didrikas, T. 2009. Multifrequency discrimination of fish and mysids. – ICES Journal of Marine Science, 66: 1106–1110. The opossum shrimp (Mysis relicta) is common in many lakes in the northern parts of Eurasia and North America. The shrimp is often an important link in the foodweb for fish, either throughout life or in early life stages. Generally, quantitative measurements of mysids in large volumes of water are difficult to obtain with traditional sampling methods. In this pilot study, measurements of volume-backscattering strength (Sv) at 38, 120, and 200 kHz were used to separate backscattering from fish and mysids. Mysids were sampled with trawls. Where mysids were caught, the correlations between mysid biomass (dry weight) and mean Sv at 120 and 200 kHz were positive (r2 = 0.89 and 0.81, respectively). Where mysids were abundant, the Sv exhibited a characteristic frequency response. This was not found where mysids were scarce or absent. Therefore, areas with great abundances of mysids can be identified, and their biomasses estimated from data collected during ecosystem monitoring.
Publisher
Oxford University Press (OUP)
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Reference20 articles.
1. Sonar4 and Sonar5-Pro Post Processing Systems. Operator Manual, version 5.9.7;Balk,2008
2. The effects of temperature and predator–prey interactions on the migration behavior and vertical distribution of Mysis relicta;Boscarino;Limnology and Oceanography,2007
3. Broad-bandwidth, sound scattering, and absorption from krill (Meganyctiphanes norvegica), mysids (Praunus flexuosus and Neomysis integer), and shrimp (Crangon crangon);Conti;ICES Journal of Marine Science,2005
4. Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders;Everson;Marine Biology,1993
5. The SIMFAMI project: species identification methods from acoustic multifrequency information;Fernandes,2006
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