The use of an ROV in the study of juvenile flatfish

Norcross, Brenda L.; Mueter, Franz-Josef

doi:10.1016/s0165-7836(98)00200-8

Cited by 34 publications

(31 citation statements)

References 18 publications

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“…This trend could possibly be due to sampling difficulties reculting from strong currents, which niay decrease the effectiveness of the beam trawl. However, video observations seem to confirm that abundances of juvenile fishes are lower on coarse sediments (Norcross & Mueter 1999).…”

Section: Discussionmentioning

confidence: 90%

Linking community structure of small demersal fishes around Kodiak Island, Alaska, to environmental variables

Mueter¹,

Norcross²

1999

Mar. Ecol. Prog. Ser.

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Juveniles and small adults of at least 75 species of demersal fishes rvere identified in trawl catches from the nearshore waters of Kodiak Island, Alaska, in August 1991 and 1992. We derived several indices to characterize community structure at each site, identified key environmental gradients along w h c h community structure was organized, and identified those species whose abundances varied most strongly along these gradients. tVe related species richness, species diversity, and total catch per unit effort to environmental variables observed at each site. Species richness and diversity were highly variable among sites, but decreased significantly with salinity and were significantly higher on heterogeneous sediments. Standardized catch per unit effort for all species combined differed significantly among 5 geographic areas and was significantly higher on sediments with a high sand and/or mud content. Indices of species composition for each sampling site were 0btainc.d as the Scores of ordination axes based on non-metric multidimensional scaling of Bray-Curtis dissimilarities bettveen sites. The indices summarized different aspects of community composition and werc associated with different species groups. The first and major index was primarily related to the depth-ternperature gradient and contrasted a shallow, warm water species group with a deep, cold water group. Non-linedr depth effects on most indices suggest relatively rapid changes in species composition in shallow water (0 to 50 m), and more gradual changes in the lower part of the depth range. While the depth-ternperature gradient was the most important gradient along which species composition was structured, sediment composition and geographic area accounted for a significant proportion of the variance of each of the indices. While species composition changed most strongly along the depth-temperature gradient, species richness, diversity, and total abundance tvere not related to depth or temperature, suggesting that species composition changed independently of the overail abundance and of species richness and diverstity.

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Section: Discussionmentioning

confidence: 90%

Linking community structure of small demersal fishes around Kodiak Island, Alaska, to environmental variables

Mueter¹,

Norcross²

1999

Mar. Ecol. Prog. Ser.

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“…With regard to the ROV, the device employed, mostly in relation to the presence of the tether, showed some difficulties of movement within the platforms' environment, limiting the observation of their inner sectors. Some of these difficulties are probably issues which even an excellent technology cannot overcome (Norcross and Mueter 1999); however, up to a certain extent, some technical features of the ROV might improve its suitability. On the basis of our experience, we learned that the power of the thrusters, the lighting apparatus and the video camera resolution are chiefly important for the use of ROV in the fish census around vertical pillars.…”

Section: Discussionmentioning

confidence: 99%

“…Besides being employed in several industrial sectors and as a fundamental support to underwater archaeological researches, ROVs have been utilized with success in the field of marine biology and ecology (Bergström et al 1987;Hamner and Robison 1992). More in detail, visual censuses by means of ROVs have been conducted to describe several benthonic communities (Auster et al 1991;Kaufmann et al 1989;Norcross and Mueter 1999), to test their effectiveness in estimating fish species abundance (Adams et al 1995;Bergström et al 1987) and to observe the behavior of some species, also in relation to the presence of the ROV itself (Lorance and Trenkel 2006;Spanier et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

et al. 2012

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The effectiveness of a remotely operated vehicle (ROV) to describe the fish communities of three gas platforms located offshore Crotone (Italy, Ionian Sea) was investigated by comparing its observations with underwater visual censuses (UVCs). The study was carried out at two depth layers (0-6 and 12-18 m). Moreover, the ROV was used to survey three deeper depth layers up to 76 m. Overall, the ROV surveys failed to give a truthful representation of the fish communities underestimating the number of species and their abundances as compared to UVCs. The main discrepancies in data regarded cryptobenthic and nekto-benthic species, whereas the ROV proved to be a suitable method to census low-mobile and abundant planktivorous species. The differences between the fish assemblage described by the ROV, with respect to the one depicted by UVC, should be considered in the light of the technical limits of the recording camera, whose resolution and field of vision is clearly lower than the diver's eye. In addition, video images did not allow for the acquisition of a correct estimate of the distance between the individuals and the platform structures. This led, almost certainly, to an under-or over-estimation of fish abundance as regards to the censused volume. In spite of this, as a result of its capacity to reach depths inaccessible to scuba divers and then to add complementary information, the ROV could be used jointly with UVCs, in studies having as their objective the description of the fish communities associated with offshore platforms.

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“…These fishes inhabit inshore locations where they co-occur with early juvenile red king crab (Dean et al 2000, Loher & Armstrong 2000, Pirtle 2010). Halibut are efficient predators of early juvenile stage red king crab (Stoner 2009) but were not observed at our field predation site; however, halibut nursery grounds (Norcross & Mueter 1999, Stoner & Titgen 2003 potentially overlap with red king crab nursery locations (Pirtle 2010).…”

Section: Predators Of Early Juvenile Red King Crabmentioning

confidence: 79%

Habitat structure influences the survival and predator–prey interactions of early juvenile red king crab Paralithodes camtschaticus

Pirtle

Eckert²,

Stoner³

2012

Mar. Ecol. Prog. Ser.

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Highly structured nursery habitats promote the survival of juvenile stages of many species by providing foraging opportunities and refuge from predators. Through integrated laboratory and field experiments, we demonstrate that nursery habitat structure affects survival and predator-prey interactions of red king crab Paralithodes camtschaticus. Crabs (< 1 yr old [Age 0]; 8 to 10 mm carapace length [CL]) preferred complex biogenic habitats formed by structural invertebrates and macroalgae over structural mimics and sand in the absence of predators in laboratory experiments, yet they associated with any available structural habitat when fish predators were present. Survival was higher in the presence of complex habitat for Age 0 crabs (5 to 7.5 mm CL) with Pacific cod Gadus macrocephalus predators in the laboratory and for Age 0 (4 to 8 mm CL) and Age 1 (16 to 28 mm CL) crabs with fish and invertebrate predators in the field. Crab activity and refuge response behavior varied with crab stage and habitat. Age 0 crabs were cryptic, avoiding predators by associating with habitat structure or remaining motionless in the absence of structure, and were less likely to respond to an attack. In contrast, Age 1 crabs were more likely to respond to an attacking predator and were less likely to remain motionless in the absence of structural refuge, suggesting an ontogenetic shift in behavior. Complex habitats, cryptic behavior, and direct defense improve juvenile red king crab survival against certain predators, including demersal fishes.

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The use of an ROV in the study of juvenile flatfish

Cited by 34 publications

References 18 publications

Linking community structure of small demersal fishes around Kodiak Island, Alaska, to environmental variables

Linking community structure of small demersal fishes around Kodiak Island, Alaska, to environmental variables

Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

Habitat structure influences the survival and predator–prey interactions of early juvenile red king crab Paralithodes camtschaticus

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