TY - GEN
T1 - Jumbo squid (Dosidicus gigas) in situ target strength measurements in northwest Mexico
AU - Villalobos, Hector
AU - Manini-Ramos, Fernando
AU - Salinas-Zavala, Cesar
AU - Brehmer, Patrice
PY - 2013
Y1 - 2013
N2 - In order to convert acoustic abundance indexes into biomass is essential to establish the relationship between squid size dorsal mantle length (DML) and acoustic Target Strength (TS). We had carried out in situ measurement in 2012 off Baja California on Dosidicus gigas. For both frequencies, we found significant differences between modes of measured and predicted TS distributions, 6 and 11 dB for 120 and 38 kHz, respectively. It is known that TS varies with several factors, including echosounder characteristics and transducer frequency and mainly the target orientation in the acoustic beam and many other biological variables. In relation to squid behavior, during the capture operation small fish schools were observed in the area, which may suggest that squid were feeding. Further observations and analysis are necessary in order to obtain reliable TS - DML relationship for jumbo squid before attempting acoustic biomass assessment methods to this important species.
AB - In order to convert acoustic abundance indexes into biomass is essential to establish the relationship between squid size dorsal mantle length (DML) and acoustic Target Strength (TS). We had carried out in situ measurement in 2012 off Baja California on Dosidicus gigas. For both frequencies, we found significant differences between modes of measured and predicted TS distributions, 6 and 11 dB for 120 and 38 kHz, respectively. It is known that TS varies with several factors, including echosounder characteristics and transducer frequency and mainly the target orientation in the acoustic beam and many other biological variables. In relation to squid behavior, during the capture operation small fish schools were observed in the area, which may suggest that squid were feeding. Further observations and analysis are necessary in order to obtain reliable TS - DML relationship for jumbo squid before attempting acoustic biomass assessment methods to this important species.
KW - Jumbo Squid
KW - acoustic Target Strength
KW - acoustic abundance indexes
KW - biomass
KW - dorsal mantle length
UR - http://www.scopus.com/inward/record.url?scp=84893347893&partnerID=8YFLogxK
U2 - 10.1109/RIOAcoustics.2013.6683994
DO - 10.1109/RIOAcoustics.2013.6683994
M3 - Contribución a la conferencia
AN - SCOPUS:84893347893
SN - 9781479903627
T3 - 2013 IEEE/OES Acoustics in Underwater Geosciences Symposium, RIO Acoustics 2013
BT - 2013 IEEE/OES Acoustics in Underwater Geosciences Symposium, RIO Acoustics 2013
PB - IEEE Computer Society
T2 - 2013 IEEE/OES Acoustics in Underwater Geosciences Symposium, RIO Acoustics 2013
Y2 - 26 July 2013 through 28 July 2013
ER -