Horizontal target strength of Luciobarbus sp. in ex situ experiments: Testing differences by aspect angle, pulse length and beam position

Rodríguez-Sánchez, Victoria; Encina-Encina, Lourdes; Rodríguez-Ruiz, Amadora; Sánchez-Carmona, Ramona

doi:10.1016/j.fishres.2014.11.020

Cited by 16 publications

(22 citation statements)

References 41 publications

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“…In agreement with previous studies, we confirm the importance of fish swimming orientation as a factor that affects the TS values in horizontal applications (Foote, 1980;Kubecka and Duncan, 1998;Burwen and Fleischman, 1998;Hazen and Horne, 2003;Frouzova et al, 2005;Henderson et al, 2007;Jech, 2011;Kubilius and Ona, 2012;Rodríguez-Sánchez et al, 2015). Lateral orientations gave consistently greater TS values than head and tail orientations.…”

Section: Discussionsupporting

confidence: 92%

“…The aspects of the fish tracks were calculated using the specific method developed by Rodríguez-Sánchez et al (2015) and implemented in Sonar5-Pro. This method employs information from the whole track, removing the Y component of the track vector.…”

Section: Acoustic Processing and Near-field Calculationmentioning

confidence: 99%

“…It is known that large variations have been encountered when fish swim from a lateral position to a head or tail position (Kubecka, 1994;Lilja et al, 2000Lilja et al, , 2004Frouzova et al, 2005;Boswell and Wilson, 2008;Pedersen et al, 2009;Rodríguez-Sánchez et al, 2015). Therefore, when horizontal applications are used, the study of these variations and their inclusion in TS-length relationships are fundamental.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Do close range measurements affect the target strength (TS) of fish in horizontal beaming hydroacoustics?

et al. 2016

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Section: Discussionsupporting

confidence: 92%

Section: Acoustic Processing and Near-field Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Do close range measurements affect the target strength (TS) of fish in horizontal beaming hydroacoustics?

et al. 2016

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“…Equation (3) is based on 12 barbel Luciobarbus sp. TL ranged from 6 to 70 cm (Rodríguez‐Sánchez, Encina‐Encina, Rodríguez‐Ruiz, & Sánchez‐Carmona, ).…”

Section: Methodsmentioning

confidence: 99%

Measuring fish length and assessing behaviour in a high-biodiversity reach of the Upper Yangtze River using an acoustic camera and echo sounder

et al. 2016

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Summary In the past decade improved acoustic hard‐ and software have enabled estimations of abundance and distribution patterns of aquatic organism, including non‐intrusive monitoring of fish migrations and behaviour. In this study, a high frequency acoustic camera (DIDSON‐LR, 1.2 MHz, 0.7 MHz) and a portable split‐beam scientific echo sounder (Simrad EY60, 200 kHz) collected acoustic data on 192 and 157 individuals within 24 hr (19–20 April 2011) in the Mituo reach of the Yangtze River, China. Mean fish length estimated from the acoustic camera data was 18.7 ± 5.6 cm, with an average swimming speed of 0.19 ± 0.13 m s−1. The mean fish target strength (TS) produced by the echo sounder was −43.8 ± 4.4 dB, which corresponded to 5.7–119.9 cm fish length when converted by three different TS‐length equations. Average swimming speed was 0.11 ± 0.06 m s−1 from the echo sounder. Compared with the actual fish catch by the three layers of drift gill net in the survey area, the target length indicated by DIDSON was more accurate than the EY60 results, which were highly affected by the choice of TS length equations. It was determined that the two devices used synchronously could estimate fish length effectively to investigate their behaviour and distribution.

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“…In fact, the formula was quantified at 120 kHz. For targeting carp species, a TS-fish length equation at 200 kHz was not available, although its horizontal ex situ TS was measured [34]. For capelin, pollock, Pacific Ocean perch, and jellyfish, their frequency response patterns were similar, between 120 and 200 kHz [35].…”

Section: Acoustic Data Analysismentioning

confidence: 99%

Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China

Lin

Gao

et al. 2020

Water

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The river–reservoir transitional zones play an important role in maintaining riverine fish biodiversity and abundance in highly regulated rivers. The Upper Yangtze River, which contains 286 fish species, is experiencing intense hydropower development. However, few studies have been conducted on the spatial distribution of fish in the river–reservoir transitional zones in the Upper Yangtze River, and it is therefore difficult to predict how this development will impact the region. In this study, a 200-kHz split-beam acoustic system in combination with biological samplings was used to investigate the composition and spatiotemporal distribution of the fish in the transition zone of the Three Gorges Reservoir (TGR) in 2017. The biological samplings comprised 7434 individuals from 61 species, 38 genera, 15 families, and 5 orders. The dominant fish species were Rhinogobio cylindricus, Coreius guichenoti, Hemiculter bleekeri, and Pelteobagrus vachelli. Acoustic detection identified the mean target strength (TS) to be −55.6 in May, −57.8 in August, and −55.8 dB in December. Accordingly, the average fish density was 4.96, 6.96, and 4.42 ind/1000 m3. Significant differences were found in the TS and fish density between flood season (August) and non-flood season (May and December). Spatially, fish preferred the meandering sections at 10–20 m deep. A size-dependent vertical distribution pattern was observed, with larger fish in the deeper layers and smaller fish in shallower waters. Lastly, our results suggest that meandering deep channels should be assigned high priority with respect to fish conservation in the Upper Yangtze River.

show abstract

Horizontal target strength of Luciobarbus sp. in ex situ experiments: Testing differences by aspect angle, pulse length and beam position

Cited by 16 publications

References 41 publications

Do close range measurements affect the target strength (TS) of fish in horizontal beaming hydroacoustics?

Do close range measurements affect the target strength (TS) of fish in horizontal beaming hydroacoustics?

Measuring fish length and assessing behaviour in a high-biodiversity reach of the Upper Yangtze River using an acoustic camera and echo sounder

Spatiotemporal Distribution and Species Composition of Fish Assemblages in the Transitional Zone of the Three Gorges Reservoir, China

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