FN Archimer Export Format
PT J
TI A method for reducing uncertainty in estimates of fish-school frequency response using data from multifrequency and multibeam echosounders
BT 
AF BERGER, Laurent
   PONCELET, Cyrille
   TRENKEL, Verena
AS 1:1;2:1;3:2;
FF 1:PDG-DOP-DCB-NSE-ILE;2:PDG-DOP-DCB-NSE-ILE;3:PDG-DOP-DCN-EMH;
C1 IFREMER, Ctr Brest, Dept NSE, F-29280 Plouzane, France.
   IFREMER, Dept EMH, F-44311 Nantes 03, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
SI BREST
   NANTES
SE PDG-DOP-DCB-NSE-ILE
   PDG-DOP-DCN-EMH
IN WOS Ifremer jusqu'en 2018
IF 1.92
TC 10
UR https://archimer.ifremer.fr/doc/2009/publication-6590.pdf
LA English
DT Article
CR CLASS 2008
BO Thalassa
DE ;Species identification;Scomber scombrus;Sardina pilchardus;Pelagic fish;Acoustics
AB Fish schools can be insonified simultaneously with multifrequency echosounders (e.g. Simrad EK60s) and a multibeam echosounder (e.g. Simrad ME70). This paper presents a method for combining these data to improve estimates of the relative frequency response r(f) of fish schools. Values of r(f) are now commonly used to classify echoes in fishery surveys. The data from the roll- and pitch-stabilized, high-resolution ME70 are used to correct beam-width effects in the multifrequency EK60 data. First, knowing the exact position and orientation of the transducers and the position of the vessel, the echoes are placed into a common geographic coordinate system. Then, the EK60 data are rejected if they do not include a significant percentage of the fish school imaged with the multibeam echosounder. Echoes that exceed the overlap threshold are used to estimate the r(f). The proposed method is applied to simulated and actual data for sardine and mackerel schools in the Bay of Biscay to estimate their r(f) values. The results for different overlap thresholds are compared with the results of a different method, one that uses adaptive thresholds on volume-backscattering strength Sv. The proposed method reduces uncertainty in estimates of r(f) for schools with an overlap of greater than 80%, and it outperforms the Sv-thresholding technique.
PY 2009
PD JUN
SO ICES Journal of Marine Science
SN 1054-3139
PU Oxford university press
VL 66
IS 6
UT 000267221600027
BP 1155
EP 1161
DI 10.1093/icesjms/fsp113
ID 6590
ER

EF