caa a22 4500 397551029 CHVBK 20180308164750.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0026 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0026 Empirical determination of in situ target strengths of three loosely aggregated pelagic fish species [Elektronische Daten] [Manuel Barange, Ian Hampton, Michael Soule] In situ measurements of target strength (TS) at 38 kHz have been taken from night-time scattering layers of anchovy, pilchard, and Cape horse mackerel in the course of routine surveys. These species have different numerical packing densities, which necessitates treating the TS data differently in each case, as the performance of single-target detectors is strongly dependent on target densities. Evidence for the presence of multiple targets in their TS distributions is presented, and empirical methods of extracting mean target strengths from them described. After careful assessment of the quality of each data point, and the removal of unwanted influences where possible, the data were used to fit TS/length expressions for the three species. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence anchovy nationallicence horse mackerel nationallicence methodology nationallicence pilchard nationallicence split-beam nationallicence target strength nationallicence Barange Manuel Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut Hampton Ian Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut Soule Michael Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 225-232 1054-3139 53:2<225 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0026 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0026 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barange Manuel Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut NATIONALLICENCE 700 1- Hampton Ian Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut NATIONALLICENCE 700 1- Soule Michael Sea Fisheries Research Institute, Private Bag X2, 8012 Rogge Bay, South Africa aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 225-232 1054-3139 53:2<225 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