caa a22 4500 397551207 CHVBK 20180308164750.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0035 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0035 Target-strength estimates of schooling herring and mackerel using the comparison method [Elektronische Daten] [Ole Arve Misund, Arvid K. Beltestad] The target strengths (TS) of schooling herring and mackerel have been estimated using the comparison method; purse-seine captures of schools measured by sonar and echo integration. For herring about 33 cm long, the results indicate an average TS of −40.8 dB, giving b=−71.1 dB as the constant in the usual TS equation (TS=20 log L+b). In the case of mackerel about 38 cm long, the average TS is −54.9 dB, which corresponds to b=−86.5 dB. The results are discussed in relation to other in situ estimates of the TS of these species. Limitations and inaccuracies in the applied method for TS estimation of schooling fish are also discussed. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence echo integration nationallicence herring nationallicence mackerel nationallicence purse seine nationallicence sonar nationallicence target strength nationallicence Misund Ole Arve Institute of Marine Research, PO Box 1870, Nordnes, N-5024 Bergen, Norway aut Beltestad Arvid K. Institute of Marine Research, PO Box 1870, Nordnes, N-5024 Bergen, Norway aut ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 281-284 1054-3139 53:2<281 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0035 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0035 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Misund Ole Arve Institute of Marine Research, PO Box 1870, Nordnes, N-5024 Bergen, Norway aut NATIONALLICENCE 700 1- Beltestad Arvid K. Institute of Marine Research, PO Box 1870, Nordnes, N-5024 Bergen, Norway aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 281-284 1054-3139 53:2<281 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