The Experts below are selected from a list of 42321 Experts worldwide ranked by ideXlab platform
Junita Diana Karlsen - One of the best experts on this subject based on the ideXlab platform.
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improving escape panel selectivity in nephrops directed Fisheries by actively stimulating Fish Behavior
Canadian Journal of Fisheries and Aquatic Sciences, 2017Co-Authors: Ludvig Ahm Krag, Bent Herrmann, Jordan P Feekings, Henrik Lund, Junita Diana KarlsenAbstract:The efficiency of escape panels inserted in trawls relies on Fish actively attempting to escape through them. However, several studies indicate that most Fish drift towards the aft end of the trawl...
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improving escape panel selectivity in nephrops directed Fisheries by actively stimulating Fish Behavior
Canadian Journal of Fisheries and Aquatic Sciences, 2017Co-Authors: Ludvig Ahm Krag, Bent Herrmann, Jordan P Feekings, Henrik Lund, Junita Diana KarlsenAbstract:The efficiency of escape panels inserted in trawls relies on Fish actively attempting to escape through them. However, several studies indicate that most Fish drift towards the aft end of the trawl, passing the escape panel through which they easily could have escaped, without making contact with it. To increase the efficiency of such panels, the contact probability needs to be improved. In this study, we investigate to what extent the efficiency of escape panels can be improved by actively stimulating the escape behaviour of Fish. The performance of two identical panel sections was compared in a twin-trawl system, one with and one without a stimulation device. A new coupled analysis method was used to explicitly quantify the improvements in contact probability and release efficiency for the escape panel. The results demonstrate that by actively stimulating escape behaviour, the contact probability and release efficiency for cod (Gadus morhua) can be significantly improved without effecting the catch of N...
Matthew R Helmus - One of the best experts on this subject based on the ideXlab platform.
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the influence of littoral zone coarse woody habitat on home range size spatial distribution and feeding ecology of largemouth bass micropterus salmoides
Hydrobiologia, 2009Co-Authors: Tyler D Ahrenstorff, Greg G Sass, Matthew R HelmusAbstract:Coarse woody habitat (CWH) may be a critical feature of lakes that influences Fish distributions, movement patterns, and feeding habits. We used radio telemetry to examine the role of CWH in determining the movements of largemouth bass (Micropterus salmoides Lacepede) in the context of two whole-lake experiments that provided a gradient of four lake basins varying in natural and manipulated CWH. We also conducted diet studies on largemouth bass in these lakes to test for correlates among consumption rate and prey selectivity with bass Behavior. Our results indicated that largemouth bass in basins with lower CWH abundances had larger home ranges, spent more time in deep water, were more selective predators, and showed lower consumption rates. Largemouth bass in basins with higher CWH abundances showed the opposite patterns. Low CWH abundances were correlated with a shift in largemouth bass foraging Behavior from sit-and-wait to actively searching. This increased activity, coupled with the potential decline of prey Fish species in the absence of CWH, may decrease largemouth bass growth potential regardless of the prey type consumed. Our results suggest that lakeshore residential development and associated removals of CWH from lakes may influence Fish Behavior, while CWH augmentation may reverse some of those changes.
Ludvig Ahm Krag - One of the best experts on this subject based on the ideXlab platform.
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improving escape panel selectivity in nephrops directed Fisheries by actively stimulating Fish Behavior
Canadian Journal of Fisheries and Aquatic Sciences, 2017Co-Authors: Ludvig Ahm Krag, Bent Herrmann, Jordan P Feekings, Henrik Lund, Junita Diana KarlsenAbstract:The efficiency of escape panels inserted in trawls relies on Fish actively attempting to escape through them. However, several studies indicate that most Fish drift towards the aft end of the trawl...
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improving escape panel selectivity in nephrops directed Fisheries by actively stimulating Fish Behavior
Canadian Journal of Fisheries and Aquatic Sciences, 2017Co-Authors: Ludvig Ahm Krag, Bent Herrmann, Jordan P Feekings, Henrik Lund, Junita Diana KarlsenAbstract:The efficiency of escape panels inserted in trawls relies on Fish actively attempting to escape through them. However, several studies indicate that most Fish drift towards the aft end of the trawl, passing the escape panel through which they easily could have escaped, without making contact with it. To increase the efficiency of such panels, the contact probability needs to be improved. In this study, we investigate to what extent the efficiency of escape panels can be improved by actively stimulating the escape behaviour of Fish. The performance of two identical panel sections was compared in a twin-trawl system, one with and one without a stimulation device. A new coupled analysis method was used to explicitly quantify the improvements in contact probability and release efficiency for the escape panel. The results demonstrate that by actively stimulating escape behaviour, the contact probability and release efficiency for cod (Gadus morhua) can be significantly improved without effecting the catch of N...
Waldo W Wakefield - One of the best experts on this subject based on the ideXlab platform.
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efforts to reduce chinook salmon oncorhynchus tshawytscha and rockFish sebastes spp bycatch in the u s west coast pacific hake merluccius productus Fishery
Fisheries Research, 2012Co-Authors: Mark J M Lomeli, Waldo W WakefieldAbstract:Abstract This study examined two versions of an open escape window bycatch reduction device (BRD) designed to reduce bycatch of Chinook salmon ( Oncorhynchus tshawytscha ) and rockFish ( Sebastes spp.) in the U.S. Pacific coast Pacific hake ( Merluccius productus ) Fishery. Tests were conducted off central Oregon during 2009 and 2010 aboard a midwater trawler. Data on Fish Behavior and gear performance were observed using autonomous high-resolution low-light color video cameras and artificial lights. During this study, one of the BRD versions reduced both Chinook salmon and widow rockFish ( S. entomelas ) bycatch. The use of artificial light was also noted to influence the Behavior of Chinook salmon. The mean escape time of Chinook salmon differed significantly between the two versions examined. Escapement of Pacific hake, the target species, was rarely observed. Results of this study suggest that there is potential for reducing Chinook salmon and widow rockFish bycatch in the Pacific hake Fishery using open escape window BRDs.
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evaluating the role of Fish Behavior in surveys conducted with underwater vehicles
Canadian Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Allan W Stoner, Clifford H Ryer, Steven Parkers J J Parker, Peter J Auster, Waldo W WakefieldAbstract:It is often assumed that visual survey data provide more accurate Fish counts than conventional extractive gear. As a result, use of underwater vehicles to assess the abundance and distribution of Fishes has increased rapidly over recent years. However, a review of observations reported for 48 demersal marine Fish taxa showed that almost all respond in some way to underwater vehicles. Whether or not movements or changes in Behavior affect survey bias is more difficult to assess. A simple conceptual model is presented to evaluate relationships between stimulus intensity, distances from the vehicle where reactions occur, and survey bias. Largest bias is caused by attraction or avoidance that occurs outside the field of cameras or observers. While light level and vehicle speed have been explored experimentally in a few cases, much remains to be learned about how bias varies among species, age groups, different vehicles, and operating conditions. Given poor understanding of survey bias, we recommend that surv...
Kieran Cox - One of the best experts on this subject based on the ideXlab platform.
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sound the alarm a meta analysis on the effect of aquatic noise on Fish Behavior and physiology
Global Change Biology, 2018Co-Authors: Lawrence P Brennan, Kieran Cox, Sarah E Dudas, Travis G Gerwing, Francis JuanesAbstract:The aquatic environment is increasingly bombarded by a wide variety of noise pollutants whose range and intensity are increasing with each passing decade. Yet, little is known about how aquatic noise affects marine communities. To determine the implications that changes to the soundscape may have on Fishes, a meta-analysis was conducted focusing on the ramifications of noise on Fish Behavior and physiology. Our meta-analysis identified 42 studies that produced 2,354 data points, which in turn indicated that anthropogenic noise negatively affects Fish Behavior and physiology. The most predominate responses occurred within foraging ability, predation risk, and reproductive success. Additionally, anthropogenic noise was shown to increase the hearing thresholds and cortisol levels of numerous species while tones, biological, and environmental noise were most likely to affect complex movements and swimming abilities. These findings suggest that the majority of Fish species are sensitive to changes in the aquatic soundscape, and depending on the noise source, species responses may have extreme and negative fitness consequences. As such, this global synthesis should serve as a warning of the potentially dire consequences facing marine ecosystems if alterations to aquatic soundscapes continue on their current trajectory.
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the effect of anthropogenic and biological noise on Fish Behavior and physiology a meta analysis
Journal of the Acoustical Society of America, 2017Co-Authors: Francis Juanes, Kieran Cox, Lawrence P Brennan, Sarah E DudasAbstract:Aquatic noise has the potential to travel extreme distances and as such many marine species rely on the soundscape for auditory information regarding habitat selection, predator or prey locations, and communication. These species not only take advantage of the prevailing sounds but also contribute to the soundscape through their own vocalizations. Certain sounds have the potential to negatively effect marine species resulting in unbalanced predator-prey interactions and disrupted communication. In an attempt to determine the implications that changes to the soundscape may have on Fishes, we conducted a meta-analysis focusing on how anthropogenic and biological noises may alter Fish Behavior and physiology. We reviewed 3,174 potentially relevant papers of which 44 met our criteria and were used in the analysis. Results indicated that anthropogenic noise has an adverse effect on marine and freshwater Fish Behavior and physiology. Alternatively biological and environmental noises did not significantly alter Fish Behavior and physiology. These findings suggest that although certain species may be more susceptible to anthropogenic noise than others, the vast majority of Fish have the potential to be negatively affected by noise pollution, while biological noises may not have the same negative consequences for Fish Behavior and physiology.Aquatic noise has the potential to travel extreme distances and as such many marine species rely on the soundscape for auditory information regarding habitat selection, predator or prey locations, and communication. These species not only take advantage of the prevailing sounds but also contribute to the soundscape through their own vocalizations. Certain sounds have the potential to negatively effect marine species resulting in unbalanced predator-prey interactions and disrupted communication. In an attempt to determine the implications that changes to the soundscape may have on Fishes, we conducted a meta-analysis focusing on how anthropogenic and biological noises may alter Fish Behavior and physiology. We reviewed 3,174 potentially relevant papers of which 44 met our criteria and were used in the analysis. Results indicated that anthropogenic noise has an adverse effect on marine and freshwater Fish Behavior and physiology. Alternatively biological and environmental noises did not significantly alter ...