Determination of the acoustic back-scattering patterns and cross sections of fish

Haslett, R.W.G.

doi:10.1088/0508-3443/13/7/316

Cited by 18 publications

(5 citation statements)

References 4 publications

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“…Swimbladder volumes estimated from this study are in fair agreement with the measurements published by Marshall (1951, I960) for like species of fish but, for the most part, are considerably less than volumes estimated by either Haslett's (1962), Andreeva and Chindonova's (1964), or Shearer's (1970) equations .…”

supporting

confidence: 90%

“…Other authors have related swimbladder volume to the more easily measured fish total length and have derived the following formulas: (Haslett, 1962) where L is apparently fish total length in cm and bladder volume equals 5 percent of total fish volume. Shearer (1970), who determined swimbladder volumes for 91 fresh specimens belonging to 4 species of mesopelagic physoclistous fishes essentially by the method of Kanwisher and Ebeling (1957), reported wide discrepancies and little correlation between estimated bladder volumes for 3 of these species and those calculated from total lengths by either equations (4) or (5).…”

Section: Swimbladder Formation and Fish Standard Lengthmentioning

confidence: 99%

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Swimbladder Allometry of Selected Midwater Fish Species

Brooks¹

1976

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supporting

confidence: 90%

Section: Swimbladder Formation and Fish Standard Lengthmentioning

confidence: 99%

Swimbladder Allometry of Selected Midwater Fish Species

Brooks¹

1976

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“…This was found to be due to two factors; first the considerable aeration of the water as it descends the ladder above the resting pool, and second the wooden inscale structure slowly giving out trapped air during the initial fortnight before the wood was thoroughly saturated as well as providing nucleii for air bubbles to form. Figure 6 shows the estimated maximum range at which it could be expected to detect a ping pong ball, equivalent to a 10 cm fish in side aspect, (Haslett, 1962) and an 11 cm sphere (30 cm fish) with a recognition differential of $6 dB (signal voltage level twice the noise level) for different parts around the pool as shown in Fig. 5.…”

Section: Tongland Trialsmentioning

confidence: 99%

A sonar fish counter

Braithwaite

1971

Journal of Fish Biology

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The basic principles of a new technique for counting fish moving up or down stream are given. The counter is based on the ability to detect the presence of fish in an acoustic beam directed across the river. The counter is capable of counting several fish moving up or down stream simultaneously and is designed for use in wide open channels. The results of field trials with the equipment at two different sites are discussed together with the problems encountered. The results obtained are in good agreetnent with other methods of counting fish but the totals obtained were insufficient to put confidence limits on the counter.

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“…Up to 95% of the backscatter of a swimbladder-bearing fish, is attributable to the swimbladder 39 due to the density contrast between gas and water 40 . Changes in the volume or surface area of the swimbladder can influence the TS significantly 41,42 and lead to considerable differences in abundance estimates.…”

Section: Introductionmentioning

confidence: 99%

Target Strength and swimbladder morphology of Mueller’s pearlside (Maurolicus muelleri)

Sobradillo

Boyra

Martinez

et al. 2019

Sci Rep

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In the last few years, there has been increasing interest in the commercial exploitation of mesopelagic fish and a trawl-acoustic methodology has been recommended to make estimates of abundance of these resources. This study provides relevant information on the scattering properties of a key mesopelagic fish species in the Bay of Biscay, Mueller’s pearlside (Maurolicus muelleri), necessary to convert the acoustic density into numerical abundance. The target strength (TS) of pearlside was estimated for the first time at five frequencies commonly used in acoustic surveys. A high-density filter was applied to reduce the bias derived from overlapping echoes erroneously assigned to single targets. Its relationship with fish length (b20) was also determined (−65.9 ± 2, −69.2 ± 3, −69.2 ± 2, −69.5 ± 2.5 and −71.5 ± 2.5 dB at 18, 38, 70, 120 and 200 kHz, respectively). Biomass estimates of pearlside in the Bay of Biscay during the four years of study (2014–2017) are given using the 38 kHz frequency. Morphological measurements of the swimbladder were obtained from soft X-ray images and used in the backscattering simulation of a gas-filled ellipsoid. Pearlside is a physoclist species, which means that they can compensate the swimbadder volume against pressure changes. However, the best fit between the model and the experimental data showed that they lose that capacity during the trawling process, when the swimbladder volume is affected by Boyle’s law.

show abstract

Determination of the acoustic back-scattering patterns and cross sections of fish

Cited by 18 publications

References 4 publications

Swimbladder Allometry of Selected Midwater Fish Species

Swimbladder Allometry of Selected Midwater Fish Species

A sonar fish counter

Target Strength and swimbladder morphology of Mueller’s pearlside (Maurolicus muelleri)

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