Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico
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 foun...
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ftird:oai:ird.fr:fdi:010064373 2023-05-15T16:01:35+02:00 Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics) Villalobos, H. Manini-Ramos, F. Salinas-Zavala, C. Brehmer, Patrice MEXIQUE PACIFIQUE 2013 http://www.documentation.ird.fr/hor/fdi:010064373 EN eng IEEE http://www.documentation.ird.fr/hor/fdi:010064373 oai:ird.fr:fdi:010064373 Villalobos H., Manini-Ramos F., Salinas-Zavala C., Brehmer Patrice. Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico. In : IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). Piscataway : IEEE, 2013, 3 p. RIO Acoustics 2013, Rio de Janeiro (BRA), 2013/07/24-26 text 2013 ftird 2020-08-21T06:53:56Z 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. Text DML IRD (Institute de recherche pour le développement): Horizon Baja |
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Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
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ftird |
language |
English |
description |
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. |
format |
Text |
author |
Villalobos, H. Manini-Ramos, F. Salinas-Zavala, C. Brehmer, Patrice |
spellingShingle |
Villalobos, H. Manini-Ramos, F. Salinas-Zavala, C. Brehmer, Patrice Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
author_facet |
Villalobos, H. Manini-Ramos, F. Salinas-Zavala, C. Brehmer, Patrice |
author_sort |
Villalobos, H. |
title |
Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
title_short |
Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
title_full |
Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
title_fullStr |
Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
title_full_unstemmed |
Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico |
title_sort |
jumbo squid (dosidicus gigas) in situ target strength measurements in northwest mexico |
publisher |
IEEE |
publishDate |
2013 |
url |
http://www.documentation.ird.fr/hor/fdi:010064373 |
op_coverage |
MEXIQUE PACIFIQUE |
geographic |
Baja |
geographic_facet |
Baja |
genre |
DML |
genre_facet |
DML |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010064373 oai:ird.fr:fdi:010064373 Villalobos H., Manini-Ramos F., Salinas-Zavala C., Brehmer Patrice. Jumbo Squid (Dosidicus gigas) in situ Target Strength measurements in Northwest Mexico. In : IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). Piscataway : IEEE, 2013, 3 p. RIO Acoustics 2013, Rio de Janeiro (BRA), 2013/07/24-26 |
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