Acoustic habitat and shellfish mapping and monitoring in shallow coastal water – Sidescan sonar experiences in The Netherlands

Overmeeren, Ronnie van; Craeymeersch, Johan; Dalfsen, Jan van; Fey, Frouke; Heteren, Sytze van; Meesters, H.W.G.

doi:10.1016/j.ecss.2009.07.016

Cited by 27 publications

(19 citation statements)

References 10 publications

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“…Towfish data could be used to discern these impacts. Sidescan sonar imagery has been successful in discerning oyster and serpulid reefs and associated anthropogenic impacts in shallow waters (Moore et al 2009;van Overmeeren et al 2009;Raineault et al 2012).…”

Section: Estuarymentioning

confidence: 99%

Bay-scale assessment of eelgrass beds using sidescan and video

Vandermeulen

2014

Helgol Mar Res

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The assessment of the status of eelgrass (Zostera marina) beds at the bay-scale in turbid, shallow estuaries is problematic. The bay-scale assessment (i.e., tens of km) of eelgrass beds usually involves remote sensing methods such as aerial photography or satellite imagery. These methods can fail if the water column is turbid, as is the case for many shallow estuaries on Canada's eastern seaboard. A novel towfish package was developed for the bay-scale assessment of eelgrass beds irrespective of water column turbidity. The towfish consisted of an underwater video camera with scaling lasers, sidescan sonar and a transponder-based positioning system. The towfish was deployed along predetermined transects in three northern New Brunswick estuaries. Maps were created of eelgrass cover and health (epiphyte load) and ancillary bottom features such as benthic algal growth, bacterial mats (Beggiatoa) and oysters. All three estuaries had accumulations of material reminiscent of the oomycete Leptomitus, although it was not positively identified in our study. Tabusintac held the most extensive eelgrass beds of the best health. Cocagne had the lowest scores for eelgrass health, while Bouctouche was slightly better. The towfish method proved to be cost effective and useful for the bayscale assessment of eelgrass beds to sub-meter precision in real time.

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Section: Estuarymentioning

confidence: 99%

Bay-scale assessment of eelgrass beds using sidescan and video

Vandermeulen

2014

Helgol Mar Res

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“…According to the authors, 72% of the intertidal populations that they assessed reached the minimum commercial size (50 mm) only after 28 months. The use of SSS equipment, as described by OVERMEEREN et al (2009), proved to be a suitable method with which to monitor the oyster habitats quantitatively. In turn, the collections from and visual observations of banks provided irrefutable evidence of the presence of these species and also served as a means for the calibration and validation of the method, as suggested by GRIZZLE et al (2008), OVERMEEREN et al (op.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…In these new studies, such as those performed by DALE et al (2002), BREHMER et al (2003, SMITH et al (2003), ALLEN et al (2005), COLLIER and HUMBER (2007), OVERMEEREN et al (2009) and BECK et al (2011, methods that employ acoustic prospecting of the bottoms of oceans, estuaries and bays have begun to be incorporated into studies of benthic organisms.…”

Section: Introductionmentioning

confidence: 99%

“…SSS can also be used in mapping and monitoring studies of the stocks of bivalve mollusks and benthic organisms in shallow water habitats (BREHMER et al, 2003;OVERMEEREN et al, 2009). Its use has been recommended as public policy in New Zealand, where there are plans to map the banks of Crassostrea gigas and Mytilus edulis in the environment (OVERMEEREN et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Its use has been recommended as public policy in New Zealand, where there are plans to map the banks of Crassostrea gigas and Mytilus edulis in the environment (OVERMEEREN et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Use of side-scan sonar for estimations of Crassostrea brasiliana (Lamarck, 1819) stocks in subtidal banks on the south coast of Brazil

Westphal

Ostrensky

2016

Braz. j. oceanogr.

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Westphal et al.: Use of sonar for estimations of oysters stocks 49Use of side-scan sonar for estimations of Crassostrea brasiliana (Lamarck, 1819) stocks in subtidal banks on the south coast of Brazil Uncontrolled extractivism has led to a worldwide reduction in oyster stocks. The use of new and more efficient management tools for impacted environments must increase. The application of such tools requires previous biological and environmental knowledge of the resident populations of these bivalve mollusks. Technical difficulties are usually associated with studies of submerged oyster banks, and these difficulties result in a considerable lack of biological data on the oysters that inhabit subtidal zones. This study aimed to survey Crassostrea brasiliana (also known as C. gasar) stocks in submerged banks and to evaluate a method with which to measure the extent of the banks and identify and quantify the oysters in the banks with the use of side-scan sonar. This study was conducted on 10 oysters banks located in the subtidal zone of Guaratuba Bay, on the south coast of Brazil. The prospection of all these banks was later validated by diving, and oyster samples (n = 20/bank) were collected for species identification with a molecular method. Only one bank contained oysters that were generically classified as Crassostrea sp.; those in the remaining banks being identified as C. brasiliana. The prospected banks contained oysters of various sizes (average 1.5 m, n = 1,107) that were heterogeneously scattered in the riverbeds. The total number of oysters in the 10 sampled banks was estimated to be 21,159.13 oysters or 1 oyster/4.5 m², which represents a low oyster density in the study site. The results validate the use of side-scan sonar as an efficient means with which to prospect for oysters in banks located within subtidal zones. O extrativismo descontrolado tem levado a uma redução mundial nos estoques de ostras. Embora o uso de novas e mais eficientes ferramentas que conduzam à redução de impactos ambientais tenham aumentado, a aplicação de tais ferramentas requer conhecimento prévio de características ambientais e biológicas das populações de moluscos bivalves residentes. Dificuldades técnicas são geralmente associadas ao estudo de bancos de ostras submersos e esta dificuldade resulta em uma considerá-vel falta de dados biológicos de ostras que habitam zonas subtidais. Este estudo objetivou pesquisar estoques de Crassostrea brasiliana (sinonímia para C. gasar) em bancos submersos e avaliar um método com o qual as medições de extensão dos bancos, identificação e quantificação das ostras nestes bancos fosse feita usando um sonar de varredura lateral. Este estudo foi conduzido em 10 bancos de ostras localizados na zona de infralitoral da baía de Guaratuba, na costa sul do Brasil. Toda a prospecção dos bancos foi validada por mergulho e amostragens de ostras (n = 20/banco), que foram coletadas para a identificação das espécies por análise molecular. Somente um banco continha ostras que foram genericamente classificadas...

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