Optimising stereo baited underwater video for sampling fish and invertebrates in temperate coastal habitats

Unsworth, Richard K. F.; Peters, Jonathan; McCloskey, Rosemary M.; Hinder, Stephanie L.

doi:10.1016/j.ecss.2014.03.020

Cited by 59 publications

(72 citation statements)

References 22 publications

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“…The deployment duration used in this investigation was 2 h, as this was deemed suitable for assessing fish communities using stereo BRUVs in temperate UK waters (Hinder et al 2013;Unsworth et al 2014). All deployments were in a depth range of between 3 and 6 m, and were placed away from meadow edges to avoid the presence of any edge effects.…”

Section: Methodsmentioning

confidence: 99%

“…N max is a metric commonly used for the quantification of the relative abundance of fish observed on underwater video (e.g. Cappo et al 2003;Unsworth et al 2014). It counts the maximum number of fish recorded at any one time (single video frame) and therefore removes the concerns associated with potentially double counting individual fish (Priede et al 1994).…”

Section: Methodsmentioning

confidence: 99%

“…The use of stereo Baited Remote Underwater Video systems (BRUVs) allows for monitoring of motile fauna within sensitive habitats. Although commonly utilised within the tropical seas, stereo baited underwater video systems remain in their infancy in the northern temperate environments, with techniques recently becoming adapted for their use in highly turbid coastal waters (Hinder et al 2013;Unsworth et al 2014). The use of a stereo BRUV system does create an artefact of attracting species to a bait station.…”

Section: The Stereo Bruv Systemmentioning

confidence: 98%

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Motile fauna of sub-tidal Zostera marina meadows in England and Wales

et al. 2014

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Despite being under continued anthropogenic threat, there exists limited evidence in the United Kingdom (UK) and northern Europe for the role of sub-tidal Zostera marina meadows in providing habitat in support of economically important fauna. This is a major issue given the need to support fisheries production into the future. Understanding this at a regional and local scale is important given that their ecosystem service value can change with factors such as environmental gradients and anthropogenic impacts. In the present study, we investigate the role of sub-tidal seagrass in supporting motile fauna including juvenile fish and invertebrates of commercial value. Seagrass meadows in three locations in the UK (Porthdinllaen, Tremadog Bay and the Isle of Wight) were examined using stereo Baited Remote Underwater Video systems (BRUVs). Twenty-six taxa were recorded, ten of which were of economic importance, including an abundance of juvenile gadoids. Although the commercially important species that we found as juveniles in seagrass are not obligate seagrass users, the resources that seagrass meadows offer to these fish potentially provide significant long-term fitness benefits, possibly enhancing the whole population. All sites sampled contained economically important fauna, but there existed a significant difference between the assemblages at different locations, with the sites in the Isle of Wight containing an impoverished fauna. Sites sampled in North Wales contained double the abundance of individuals and over three times the number of species than those in the Isle of Wight. This highlights that ecosystem services such as habitat provision are not constant between sites and possibly impacted upon by site condition and locally specific environmental differences. The present study provides evidence of the importance of seagrass meadows in the UK for supporting biodiversity and the need to protect these sensitive habitats.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: The Stereo Bruv Systemmentioning

confidence: 98%

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Motile fauna of sub-tidal Zostera marina meadows in England and Wales

et al. 2014

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“…This deployment length provided the best compromise between sufficient bait soak time for species accumulation, as tested by Unsworth et al (2014), and the need to bait and redeploy each camera multiple times on each sampling day. To minimise the possibility of deployments affecting each other, SBRUV deployments on the same day were a minimum distance of 500 m apart to minimise the possibility of juveniles swimming between SBRUV deployments.…”

Section: Data Collectionmentioning

confidence: 99%

Juvenile gadoid habitat and ontogenetic shift observations using stereo-video baited cameras

Elliott¹,

Turrell²,

Heath³

et al. 2017

Mar. Ecol. Prog. Ser.

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The protection of species requires an understanding of their habitat requirements and how habitat characteristics affect their distribution, survival and growth. This need is especially important in areas where anthropogenic pressures can not only have a significant direct impact on the survival of the species but also damage their habitat. The Firth of Clyde in southwestern Scotland was an important commercial fishing area for a variety of demersal fish species up until 1973. However, stocks rapidly declined thereafter and the catch of targeted species ceased in 2005, despite fisheries measures put in place to aid recovery. Changes in the availability and quality of fish habitat are possible explanations for this lack of recovery. Here, we report on stereo baited remote underwater video surveys in the Firth of Clyde between June and September in 2013 and 2014 to determine the habitat of juvenile Atlantic cod Gadus morhua, haddock Melanogrammus aeglefinus and whiting Merlangius merlangus. Habitat predictor variables explored included substratum type, depth, wave fetch, and epibenthic and demersal fauna diversity. G. morhua were most abundant in shallow, sheltered areas composed of gravel−pebble containing maerl. M. aeglefinus and M. merlangus predominated over deeper sand and mud. Ontogenetic shifts in all 3 species were also observed. Relative abundances of G. morhua and M. merlangus were positively related to the diversity of epibenthic and demersal fauna. Our results indicate that spatial conservation measures to benefit demersal fish should be advised by patterns of epibenthic and demersal fauna diversity as well as physical substratum types.

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“…They show that access to food is a principal driver of growth, but that variation in size and density is to a great extent linked to sediment characteristics. Alternative methods of assessing underwater fish assemblages are discussed by Unsworth et al (2014), who examined the use of stereo baited remote underwater video systems (BRUVs) as a method for assessing motile fauna within shallow coastal waters. Data are presented on the capacity of the system to measure fish and invertebrate size and how the system can be modified for optimized usage within low visibility waters.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%