Hydroacoustics as a tool for assessing fish biomass and size distribution associated with discrete shallow water estuarine habitats in Louisiana

Boswell, Kevin M.; Wilson, Matthew P.; Wilson, Charles A.

doi:10.1007/bf02841958

Cited by 60 publications

(63 citation statements)

References 29 publications

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“…Salinities were measured with a handheld multiparameter instrument (YSI Model 85; Yellow Springs Instruments, Yellow Springs, Ohio). Each sampling station was characterized by the presence of adjacent oyster and soft-bottom substrates identified from side-scan sonar mosaics (Allen et al 2005;Boswell et al 2007); depth was measured with a sounding pole. The GT region did not contain significant oyster habitat, so a high-salinity oyster habitat station was established at nearby Queen Bess Island (QB; salinity ¼ 20.05 6 1.58 psu).…”

Section: Methodsmentioning

confidence: 99%

“…For consistency, efforts were made to place the transducers in similar locations and orientations but aimed in opposite directions. Refer to Boswell et al (2007) for more details on the acoustic methods.…”

Section: Methodsmentioning

confidence: 99%

“…Initially, the data were manually edited to exclude unwanted reverberation (entrained air and surfacebottom scatter). Data collected between the near-field range (0.29 m) of the transducer to the onset of reverberation from either the water surface or substrate (range, 20-30 m) were used in the analyses to exclude potential biases from scattering losses (e.g., reverberation and environmental noise) (Guillard 1998;Trevorrow 1998;Boswell et al 2007). Sound speed and absorption coefficients were applied to account for the effects of temperature and salinity on the acoustic transmissions.…”

Section: Methodsmentioning

confidence: 99%

“…Hydroacoustic sampling is widely accepted as a method for enhancing fisheries assessments and is gaining momentum as a survey technique in shallowwater environments (Krumme and Saint-Paul 2003;Boswell et al 2007). Most studies utilize acoustics to provide complementary estimates of fish abundance and density while relying on direct biological sampling to gain information on the composition of the fish community (Yule 2000; Mackinson et al 2004;Simmonds and MacLennan 2005).…”

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confidence: 99%

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Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Boswell

Wilson²,

Macrae

et al. 2010

Mar Coast Fish

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We conducted hydroacoustic, gill‐net, and push trawl surveys to quantify changes in habitat‐specific fish size and biomass in shallow (<2‐m) estuarine waters of Barataria Bay, Louisiana, in order to evaluate essential fish habitat. Surveys were conducted monthly between June 2003 and May 2004 among regions located along a north—south salinity gradient. The fish length distributions derived from the gill‐net and push trawl catches showed moderate concordance with the measured target strength distributions, indicating that our integrated approach more effectively characterized the fish community than using only a single gear type would have. Acoustic estimates showed that biomass was highest during fall (mean ± SE; 2.30 ± 0.27 g/m3) and next highest in spring (1.49 ± 0.20 g/m3), with relatively low biomass during summer (0.70 ± 0.14 g/m3) and winter (0.86 ± 0.14 g/m3); pelagic fish biomass from nets was low during winter (53.9 ± 14.9 grams per unit effort [gpue]) but relatively high in fall (846.1 ± 207.2 gpue), spring (774.3 ± 175.5 gpue), and summer (620.3 ± 140.7 gpue). Oyster habitat supported a greater biomass of pelagic fish (acoustic survey: 1.54 ± 0.15 g/m3; gill‐net survey: 467.3 ± 81.0 gpue) than soft‐bottom habitat (acoustic: 0.94 ± 0.11 g/m3; gill‐net: 315.2 ± 54.8 gpue). Among regions, the greatest biomass of pelagic fish was observed at polyhaline stations (acoustic: 1.78 ± 0.19 g/m3; gill‐net: 654.3 ± 136.5 gpue), followed by mesohaline (acoustic: 1.18 ± 0.15 g/m3; gill‐net: 378.5 ± 79.1 gpue) and oligohaline stations (acoustic: 0.82 ± 0.12 g/m3; gill‐net: 228.3 ± 50.2 gpue). Gill‐net biomass was linearly related to the acoustic biomass estimates of small pelagic fish. The complementary, multigear approach proved to be useful in evaluating habitat use and may be particularly helpful in identifying and monitoring ecosystem reference points to evaluate change and in standardizing ecosystem‐based assessment approaches.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Boswell

Wilson²,

Macrae

et al. 2010

Mar Coast Fish

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“…For water depths of less than 5 m, horizontally applied sonar surveys have recently been made possible due to transducer and post-processing technology, especially through the development of narrow acoustic beams (Boswell, Wilson, Wilson 2007;Knudsen, Saegrov 2002;Simmonds, MacLennan 2005). With proper alignment, horizontally deployed transducers are capable of fish detection at ranges many times that of the water depth.…”

Section: Acoustic Sensing Of Fish Schoolsmentioning

confidence: 99%

Remote sensing of environmental indicators of potential fish aggregation: An overview

Klemas

2012

Baltica

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Sustainable use of marine resources requires effective monitoring and management of the world’s fish stocks. Acoustic and electromagnetic remote sensing techniques are being used to help manage fisheries at sustainable levels, while also guiding fishing fleets to locate fish schools more efficiently. Fish tend to aggregate in ocean areas that exhibit conditions favored by specific fish species. Some of the relevant oceanographic conditions, such as sea surface temperature, ocean color (productivity) and oceanic fronts, which strongly influence natural fluctuations of fish stocks, can be observed and measured by remote sensors on satellites, aircraft and ships. The remotely sensed data are provided in near-real time to help fishermen save fuel and ship time during their search for fish, to modelers who produce fisheries forecasts, and to scientists who help develop strategies for sustainable fisheries management. This article describes how acoustic, optical and radar sensors on ships, satellites and aircraft are used with forecast models to improve the management and harvesting of fisheries resources.

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eDNA metabarcoding from aquatic biofilms allows studying spatial and temporal fluctuations of fish communities from Lake Geneva

et al. 2023

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Fish communities are now studied non‐invasively using environmental DNA (eDNA) recovered from water samples. The objective of this study is to evaluate the possibility of surveying these communities using fish eDNA passively “captured” by aquatic biofilms. To this end, biofilm samples developing on natural and artificial substrates were collected every 2 weeks for a year and a half in a large lake (Lake Geneva). DNA was extracted from biofilms and fish communities were targeted using a standard 12S barcode with a metabarcoding approach. The fish eDNA signal recovered from biofilms revealed temporal and spatial changes in fish communities. These changes were linked to fish habitat preferences and spawning season. Peaks in the eDNA signal of some taxa fitted with their spawning period reported in the literature. We evidenced that the nature of the biofilm's substrate (natural or artificial) does not affect the image obtained of the fish community composition. Furthermore, by using biofilms grown on artificial substrates, the studied temporal window of the eDNA signal can be controlled. With biofilms acting as environmental passive samplers, our results open up the possibility to accurately monitor fish communities and their temporal and spatial changes with eDNA in a faster and less expensive way than with the classical water filtration approach.

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Hydroacoustics as a tool for assessing fish biomass and size distribution associated with discrete shallow water estuarine habitats in Louisiana

Cited by 60 publications

References 29 publications

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Seasonal Estimates of Fish Biomass and Length Distributions Using Acoustics and Traditional Nets to Identify Estuarine Habitat Preferences in Barataria Bay, Louisiana

Remote sensing of environmental indicators of potential fish aggregation: An overview

eDNA metabarcoding from aquatic biofilms allows studying spatial and temporal fluctuations of fish communities from Lake Geneva

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