1,721,191 research outputs found
Vectrino + ADV files, trial data and supplementary information
No full textVectrino + Acoustic Doppler Velocimetry files for each treatment (.vno files), trial data for all fish (.xlsx) and supplementary information to go with main manuscript (.docx).
Dataset to support:
Kerr, James et al (2016) Assessing hydrodynamic space use of brown trout, Salmo trutta, in a complex flow environment: A return to first principles. Journal of Experimental Biology</span
Experimental Data for Research: Masking a fish′s detection of environmental stimuli: application to improving downstream migration
No full textDataset includes raw Acoustic Doppler Velocimeter data and results of the fish trials with tracked positions.
This dataset supports the publication:
Kerr, J., & Kemp, P. (2018). Masking a fish′s detection of environmental stimuli: application to improving downstream migration.
Journal of Fish Biology. DOI: 10.1111/jfb.13812</span
Experimental data for the journal article: The effects of simulated hydropower turbine rapid decompression on two Neotropical fish species.
No full textExperimental data for research: The effects of simulated hydropower turbine rapid decompression on two Neotropical fish species. </span
Experimental data for the journal paper: Modelling fine scale route choice of upstream migrating fish as they approach an instream structure
No full textExperimental data collected in the process of modelling fine scale route choice of upstream migrating fish as they approach an instream structure. Specifically, river lamprey at Buttercrambe Weir, Yorkshire, UK. Data include PIT and acoustic (XXXX.csv files) telemetry detections, hydraulic model outputs (QXX.xyz files) and bank elevation measurements.</span
Quantification of new methods, behaviour and hydrodynamics for improving fish passage at anthropogenic barriers
No full textFish passes, which are designed to promote the free passage of fish past riverine obstructions, generally perform poorly for the entire community and even target species are not able to pass as well as previously thought. This is often because: 1) Fundamental knowledge of how fish interact with the complex hydrodynamic conditions within passes is lacking, 2) passage technology is less well developed for weaker swimming non-salmonid species, and 3) fish display complex behaviours, such as rejecting accelerating velocity gradients associated with downstream bypass intakes. This thesis addresses these issues.Current understanding on how fish interact with complex flows is discussed, and limitations and knowledge gaps highlighted. Previous studies in this field have generally focussed on identifying correlative links between one of any number of hydrodynamic metrics. However, often the causal reason behind these links is obscure. This issue was addressed by returning to first principles and experimentally investigating the behaviour of brown trout, Salmo trutta, under the simple assumption that space use should be governed by energy conservation strategies. The results indicate that fish use space as predicted; through either the selection of low drag regions or where they could express specialised energy reducing behaviours (e.g. the Kármán gait). A simple, robust and biologically relevant hydrodynamic descriptor of drag that can be used as a proxy for the energetic cost of holding station in a turbulent flow is described and tested and two new specialised behaviours identified (wall holding and tail holding).European eel, Anguilla anguilla, and river lamprey, Lampetra fluviatilis, are both weaker swimming non-salmonid fish, which are in decline, and for which conventional fish passes perform poorly. Experimental trials were undertaken to quantify the efficiency of a new method for improving the upstream passage of eel and lamprey at a model crump weir. Side-mounted and vertically oriented bristle passes improved the upstream passage of both species although there was interspecific differences in their efficacy, with the passes being more effective for eel than lamprey. Behavioural observations of both species as they used the bristle passes will aid in optimisation of this and similar pass types.According to Signal Detection Theory (SDT), the ability to detect a signal (discriminability) decreases with increasing levels of internal and/or external noise. Brown trout were used to test whether hydrodynamic noise would mask the detection of an accelerating velocity gradient as fish moved downstream. The experimental results were inconclusive but they represent the first attempt to use SDT as a tool to manipulate animal behaviour and aid in the conservation of vulnerable species. As such they provide a useful platform for future research.Experimental research presented within this thesis has advanced scientific knowledge that will aid in the development of methods to improve fish passage at migration barriers. The changes brought about as a result of this research will help conserve vulnerable fish species, something that should, in turn, help promote productive and resilient ecosystems that benefit society
Dataset supporting the publication "Accuracy of coarse-resolution protocols for assessing fish passability at river infrastructure"
No full textDataset supporting the publication "Accuracy of coarse-resolution protocols for assessing fish passability at river infrastructure", Ecological Informatics (2024) https://doi.org/10.1016/j.ecoinf.2024.102575
The data is presented in excel file. Tab 1 "Existing_data_and_prot_scores" contains data on the 13 river barriers in England where existing telemetry data was available on fish passage efficiency. The barrier name / source ID are retained from the source literature for ease of cross-referencing. Fish length, barrier height, fish passage efficiency (telemetry score) and the two barrier passability scores (ICE and SNIFFER) are included. Note that some of the protocol passability scores deviate from the categories defined by the protocols. This is because the size range of fish for which passage efficiency data were available did not always match that for which the protocol passability scores was generated. In these instances, the mean score of the protocol groups for which telemetry data were available was used in the analysis and presented here. Tab 2 "Prot_scores_for_species" contains the coarse-resolution rapid barrier assessment protocol scores (for both ICE and SNIFFER) for each barrier for Adult trout, Adult grayling, Adult lamprey and Juvenile salmonids.
This project was funded by the Horizon 2020 AMBER (Adaptive Management of Barriers in European Rivers) project (no. 689682). </span
Efficacy of a side-mounted vertically oriented bristle pass for improving upstream passage of European eel (Anguilla anguilla) and river lamprey (Lampetra fluviatilis) at an experimental Crump weir
No full textGlobally, populations of diadromous anguilliform morphotype fish, such as eel and lamprey, have experienced substantial declines, partly as a result of habitat fragmentation caused by river infrastructure. In the UK, a new configuration of hydraulically unobtrusive bristle pass (side-mounted and vertically oriented) has been developed to help upstream moving European eel (Anguilla anguilla) negotiate gauging weirs. The efficacy of vertically oriented bristle passes remains untested, despite their potential as a low-cost low-maintenance solution to improve habitat connectivity at low-head structural barriers worldwide. This study assessed the ability of small (82–320 mm) and large (322–660 mm) European eel and adult (291–401 mm) river lamprey (Lampetra fluviatilis) to pass upstream over an experimental Crump weir installed in a large open-channel flume with (treatment) and without (control) side-mounted vertically oriented bristle passes under three different hydraulic regimes. Both species were highly motivated to explore their surroundings and move upstream during the trials. Under flooded control conditions, passage efficiency (the total number of times fish passed the structure as a percentage of total attempts) and passage success (the number of fish that passed the structure as a percentage of those that attempted) were high, delay was short, and number of failed attempts before passage was low for both species. When difference in head was at its greatest (230 mm) and velocity and its variation downstream were high (maximum u and ?: 2.43 ms?1 and 0.66 ms?1, respectively), the upstream movement of small eel and lamprey was blocked, and passage efficiency and success for large eel low (4.6% and 17.2%, respectively). For large eel that successfully passed, delay was long, and number of failed attempts before upstream passage was high. When bristle passes were installed, passage efficiency for small (91.5%) and large eel (56.7%), and passage success for large eel (76.5%) and lamprey (36.7%) was higher, while delay and the number of attempts before passage was lower for both species. Bristle passes helped European eel and river lamprey pass a small experimental Crump weir, although interspecific variation in efficacy was evident
Dataset for the journal paper 'River infrastructure and the spread of freshwater invasive species: inferences from an experimentally-parameterised individual-based model'
No full textData associated with article 'River infrastructure and the spread of freshwater invasive species: inferences from an experimentally-parameterised individual-based model', published in the Journal of Applied Ecology</span
Masking a fish's detection of environmental stimuli: application to improving downstream migration at river infrastructure
No full textAccording to Signal Detection Theory, the ability to detect a stimulus (discriminability, d') is inversely related to the magnitude of internal and external noise. In this study, downstream moving brown trout Salmo trutta were used to investigate whether external hydrodynamic noise (in this case turbulence) could mask a signal that induced an unwanted response, such as rejecting accelerating velocity gradients commonly encountered at entrances to fish bypass channels. S. trutta behaviour was quantified in the absence (control) or presence of an accelerating velocity gradient created by an unconstricted or constricted channel, respectively, under two levels (low and high) of background turbulent kinetic energy (hydrodynamic noise). Experiments were conducted in an indoor recirculating flume in the dark and a range of passage metrics were quantified. Under the control condition, most (ca. 91%) S. trutta passed, usually oriented downstream (67%), with minimal delay (median 0.13 min). In comparison, fewer S. trutta (ca. 43%) passed under constricted conditions, they tended to orient facing into the flow (ca. 64%) and delay was greater (median > 20 min). When viewed from a coarse-scale perspective, discriminability of the velocity gradient was lower when turbulence was high suggesting masking of the signal occurred. However, the resulting increase in the percentage of fish that passed, decrease in time to pass and reduction in the distance at which S. trutta reacted (switched orientation) was subtle and non-significant. Despite the mixed results obtained, the use of masking to manipulate an animal's perception of environmental stimuli as a fisheries management tool is conceptually valid and the results of this experiment present a useful stepping stone for future research.</p
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