Relevant bibliographies by topics / Trawling

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Trawling'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Trawling"

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Jones, Peter. "The spread of bottom trawling in the British Isles, c.1700–1860." International Journal of Maritime History 30, no. 4 (November 2018): 681–700. http://dx.doi.org/10.1177/0843871418804486.

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Widespread bottom trawling in British waters has traditionally been dated from the last decades of the 18th century, and its early heartland has most commonly been identified as the Torbay area of Devon. This article shows that, in fact, by the time Torbay became known as a centre for the industry, bottom trawling was already well-known and relatively widespread around much of England and Wales, as well as large parts of Eastern and Southern Ireland. Following on from an earlier contribution in this journal, it also demonstrates that bottom trawling’s unbroken history, going back to at least the first decades of the 17th century, has always been beset by controversy, but that the middle decades of the 19th century saw a sea-change in official attitudes that, in effect, ushered in an era of unfettered expansion in industrial beam trawling by the 1890s.
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Bergman, Magda J. N., and Erik H. Meesters. "First indications for reduced mortality of non-target invertebrate benthic megafauna after pulse beam trawling." ICES Journal of Marine Science 77, no. 2 (January 17, 2020): 846–57. http://dx.doi.org/10.1093/icesjms/fsz250.

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Abstract Two alternative stimulation techniques to reduce mortality in benthic megafauna were tested relative to standard tickler chain beam trawling: longitudinal electrodes (pulse trawl) and longitudinal chains. Longitudinal chains caused higher mortality than pulse trawling in 3 species. Standard trawling gave higher mortality in Echinocardium cordatum than pulse trawling. Between longitudinal chain and standard trawling were no significant differences. This trend in decreasing mortality from longitudinal, to standard and then pulse trawling was confirmed by a similar decline in: i) numbers of significant species mortalities per trawl type, ii) average mortalities, i.e. longitudinal chain caused 41% more mortality than standard trawling and pulse trawling 43% less, iii) pre- and post-trawling community dissimilarities. A significant majority of species showed higher mortalities after longitudinal than after standard trawling and, conversely, lower mortalities after pulse trawling. Trawls with longitudinal chains instead of cross tickler chains increase megafaunal impact. On the contrary, pulse trawling can reduce the impact, although average mortality remains substantial (25%) even in impoverished benthic test assemblages in the southern North Sea. Power, generally was low and reference areas, free of (pulse) trawling, and inhabited by more vulnerable taxa will facilitate higher powered studies on the impact of standard and alternative trawling techniques.
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Rijnsdorp, A. D., J. G. Hiddink, P. D. van Denderen, N. T. Hintzen, O. R. Eigaard, S. Valanko, F. Bastardie, et al. "Different bottom trawl fisheries have a differential impact on the status of the North Sea seafloor habitats." ICES Journal of Marine Science 77, no. 5 (April 24, 2020): 1772–86. http://dx.doi.org/10.1093/icesjms/fsaa050.

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Abstract Fisheries using bottom trawls are the most widespread source of anthropogenic physical disturbance to seafloor habitats. To mitigate such disturbances, the development of fisheries-, conservation-, and ecosystem-based management strategies requires the assessment of the impact of bottom trawling on the state of benthic biota. We explore a quantitative and mechanistic framework to assess trawling impact. Pressure and impact indicators that provide a continuous pressure–response curve are estimated at a spatial resolution of 1 × 1 min latitude and longitude (∼2 km2) using three methods: L1 estimates the proportion of the community with a life span exceeding the time interval between trawling events; L2 estimates the decrease in median longevity in response to trawling; and population dynamic (PD) estimates the decrease in biomass in response to trawling and the recovery time. Although impact scores are correlated, PD has the best performance over a broad range of trawling intensities. Using the framework in a trawling impact assessment of ten métiers in the North Sea shows that muddy habitats are impacted the most and coarse habitats are impacted the least. Otter trawling for crustaceans has the highest impact, followed by otter trawling for demersal fish and beam trawling for flatfish and flyshooting. Beam trawling for brown shrimps, otter trawling for industrial fish, and dredging for molluscs have the lowest impact. Trawling is highly aggregated in core fishing grounds where the status of the seafloor is low but the catch per unit of effort (CPUE) per unit of impact is high, in contrast to peripheral grounds, where CPUE per unit of impact is low.
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Hanna, Jack, Seán Power, Phil O'Keeffe, and Mary Ryan. "Trawling the Past." Books Ireland, no. 194 (1996): 93. http://dx.doi.org/10.2307/20623248.

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Nuwer, Rachel. "Trawling for Viruses." Scientific American 313, no. 6 (November 17, 2015): 34. http://dx.doi.org/10.1038/scientificamerican1215-34a.

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Warren, Graham. "Trawling for receptors." Nature 346, no. 6282 (July 1990): 318–19. http://dx.doi.org/10.1038/346318b0.

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Gregg, J. Marty, and Amit Kumar. "Trawling for complements." Nature 510, no. 7506 (June 2014): 481–82. http://dx.doi.org/10.1038/510481a.

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Hinz, Hilmar, Jan G. Hiddink, James Forde, and Michel J. Kaiser. "Large-scale responses of nematode communities to chronic otter-trawl disturbance." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 4 (April 1, 2008): 723–32. http://dx.doi.org/10.1139/f08-002.

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Nematodes, because of their small size and short life cycles, are thought to be less affected by direct trawling mortality compared with the larger macrofauna. However, nematodes may still be indirectly affected by the physical disturbance of trawling through changing sediment characteristics and food web structure. We determined whether nematode communities on two muddy fishing grounds located in the North Sea and Irish Sea were affected by chronic otter-trawl disturbance and quantified these effects. Nematode abundance, production, and genus richness declined in response to trawling within both areas. Nematode biomass did not respond to trawling intensity. Genus composition was affected by trawling only in the North Sea. The responses in abundance of individual nematode genera to increasing trawling intensity were negative as well as positive. These results indicate that despite their size and fast life cycle, nematodes are affected by intensive trawling on muddy fishing grounds. The loss in secondary production from nematodes can have far-reaching consequences for the integrity of the benthic food web. As bottom trawl fisheries are expanding into ever deeper muddy habitats, the results presented here are an important step towards understanding the global ecosystem effects of bottom trawling.
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Mills, Craig M., Sunny E. Townsend, Simon Jennings, Paul D. Eastwood, and Carla A. Houghton. "Estimating high resolution trawl fishing effort from satellite-based vessel monitoring system data." ICES Journal of Marine Science 64, no. 2 (December 14, 2006): 248–55. http://dx.doi.org/10.1093/icesjms/fsl026.

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Abstract Mills, C. M., Townsend, S. E., Jennings, S., Eastwood, P. D., and Houghton, C. A. 2007. Estimating high resolution trawl fishing effort from satellite-based vessel monitoring system data. – ICES Journal of Marine Science, 64: 248–255. High resolution estimates of trawling effort are needed to underpin studies of trawling impacts on species, habitats, and ecosystem processes, and to monitor responses to area closure and other management actions. Satellite-based vessel monitoring systems (VMS) were designed for fishery control and enforcement, but they provide potentially valuable source information on spatial and temporal patterns of trawling activity at multiple scales. Based on an analysis of VMS data for UK beam trawlers in the North Sea, a method is described for identifying trawling activity and estimating fishing intensity based on the minimum and maximum potential spatial extent of trawling effort from VMS data. The optimal method for identifying trawling and steaming behaviour combined speed and directionality rules and correctly identified trawling and steaming in 99% and 95% of cases, respectively. Using speed- and directionality-filtered VMS data, trawling effort can be reported as area impacted per unit time per unit area at a range of grid scales from 1 km to 100 km (10 000 km2). Trawling effort is accurately represented at a grid cell resolution of 3 km or less.
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Kenchington, E. LR, J. Prena, K. D. Gilkinson, D. C. Gordon Jr., K. MacIsaac, C. Bourbonnais, P. J. Schwinghamer, T. W. Rowell, D. L. McKeown, and W. P. Vass. "Effects of experimental otter trawling on the macrofauna of a sandy bottom ecosystem on the Grand Banks of Newfoundland." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 6 (June 1, 2001): 1043–57. http://dx.doi.org/10.1139/f01-053.

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A 3-year otter trawling experiment was conducted on a deepwater (120–146 m) sandy bottom ecosystem on the Grand Banks of Newfoundland that had not experienced trawling for at least 12 years. The benthic macrofauna were sampled before and after trawling and in reference areas. The 200 grab samples collected contained 246 taxa, primarily polychaetes, crustaceans, echinoderms, and molluscs. Biomass was dominated by propeller clams (Cyrtodaria siliqua) and sand dollars (Echinarachnius parma), while abundance was dominated by the polychaete Prionospio steenstrupi and the mollusc Macoma calcarea. The most prominent feature of the data was a natural decline in the total number of species, the total abundance, and the abundance and biomass of selected species between 1993 and 1995. The only immediate effect of trawling was seen in 1994 when the abundance of 13 species, the biomass of 11 species (mostly polychaetes), and the total abundance per grab were significantly lower. There was little evidence of long-term trawling effects. When trawling disturbance was indicated, it appeared to mimic natural disturbance, shifting the community in the same direction in multidimensional scaling ordination; no distinctive trawling signature was observed. However, the results of this experiment should not be uncritically extrapolated to the impacts of commercial trawling.
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Dissertations / Theses on the topic "Trawling"

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Udoff, Geoffrey. "An Alternate Trawling Method: Reduced Bycatch and Benthic Disturbance Achieved with the Wing Trawling System." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2217.

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The Wing Trawling System (WTS) was tested as an alternative to traditional shrimp capture methods in the Gulf. Compared to an otter trawl, this trawl was conceived to reduce bycatch, retain shrimp catch, and minimize seafloor disturbance. Through seventy-one paired tows, the WTS was assessed against a standard otter trawl. The WTS was found to reduce bycatch by 63-65% and reduce shrimp catch by 30-35%. Additionally, I measured the depth of the scars produced by both trawls and quantified the turbidity of the plumes behind them. The scars left by the WTS and the otter trawl were between 9.9 cm-13.6 cm. The turbidity behind the WTS was 18.6 NTU, while the turbidity behind the otter trawl was 206.8 NTU. In conclusion, the WTS offers an alternative to an otter trawl that reduces bycatch and the impact trawling has on the seafloor but results in a significant amount of shrimp loss.
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Sterling, David John. "Modelling the physics of prawn trawling for fisheries management." Curtin University of Technology, School of Physical Sciences, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16093.

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Management of prawn trawling fisheries is a difficult task due to the competing interests of strongly motivated stakeholders and interest groups. This occurs because prawn trawling operations are technically complex, require large capital investments and exhibit high running costs while owners have limited property rights over the resources that they harvest. Prawn stocks are public resources and are managed with a view to provide maximum benefit to the broad community. Additionally their exploitation also involves the incidental capture of significant numbers of other animals of no commercial value (bycatch) and causes impacts on seabed morphologies, which are involved in many diverse ecosystem processes. At the policy level an intention to manage trawl fisheries in a comprehensive way is backed by a mandated approach that is designed to capture all of the above issues and interests. That approach is termed Ecological Sustainable Development (ESD). The work in this thesis is designed to produce a prediction tool for prawn trawling performance that is based on modelling the physical nature of prawn trawling activities. It is proposed that the resulting tool is essential for working to manage the multi-dimensional aspects of prawn trawling fisheries. Three discrete objectives for the thesis are; to expand and improve an existing Prawn Trawling Performance Model (PTPM) so that it is more accurate and relevant to a broader range of questions, to evaluate the capacity of the PTPM to predict the performance characteristics of real prawn trawling operations in terms of both engineering and catching performance and to investigate the problem space surrounding prawn trawl fisheries to identify and develop applications for the model. A rudimentary PTPM (Sterling 2000b) is expanded through the analysis of further empirical data collected for model and full-scale trawl gear.
ght area of improvement to the PTPM were considered and in all cases significant changes were made. The accuracy of the new form of the model is here tested by comparing performance predictions with measurements of trawling performance for a variety of industrial trawl systems operated in the Queensland East Coast Trawl Fishery and also through comparing predicted trawling performance with prawn catches returned for trawlers operating in the Northern Prawn Fishery over the years 1970 to 2000. In the first case, errors in predicting swept area rate, considered an important performance parameter, were less than 5%. Fine scale issues were explored using the available sea mal data and a number of areas of concern within the model are highlighted. These relate to accurately quantifying the forces involved in the interaction of the trawl gear with the seabed and accurately accounting for the interaction between components within trawl systems. In the second case, the results suggest that between 50% and 60% of the variation in the seasonal catching performance of trawlers in the NPF is explained by predictions of swept area rate derived by the PTPM from the available data for that fishery. A comprehensive survey of applications for the PTPM is conducted in context with approaching the management of prawn trawling fisheries using the principles of ESD as defined by the National Strategy for ESD (1992). The Northern Prawn Fishery is used as a case study to explore in finer detail applications for the PTPM. Issues arising from the implementation of some of the applications are discussed.
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Sterling, David J. "Modelling the physics of prawn trawling for fisheries management /." The Gap, Qld. : Sterling Trawl Gear Services, 2005. http://adt.curtin.edu.au/theses/available/adt-WCU20050921.093622.

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Alves, Fábio Rui Lima. "Traits of benthic assemblages subjected to different trawling pressure." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12618.

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Mestrado em Biologia Marinha
Over time, fishing techniques improved as a response to the needs of Human populations. Alongside with the increase of fishing activities important changes in the marine ecosystems were also observed (e.g. overexploitation of stocks and habitat loss or degradation). Overfishing, bycatch, discards and ghost-fishing are some of the most discussed impacts of fishing activities, but the effect of bottom trawling should not be underestimated, since it has been proven to have a significant impact of benthic communities. Up to now the knowledge about fisheries impact on deep-sea benthic macrofaunal assemblages is scarce in Europe and, for all we know, even more in Portuguese fishery grounds. However, assessing fisheries impacts on marine ecosystems and ensuring fisheries sustainability is essential to achieve proper management of the sector and for the conservation of marine resources. In this context, the present study was carried out aiming to investigate the impact of continued trawling on benthic macrofaunal assemblages from deep muddy grounds of the burrowing crustacean Nephropsnorvegicus (Norway lobster) by comparing towed and untowed stations regarding their biodiversity, density, biomass, trophic structure, life style and body size spectra. Seven stations were studied along a transect of a highly Fished zone (Area 1, Stations 1 and 2), a Non-fished zone (Area 2, Stations 3, 4 and 5) and another Fished zone (Area 3, stations 6 and 7) during a cruise carried out in September 2012 onboard the RV Garcia del Cid (Consejo Superior de Investigaciones Cientificas) in the framework of the project IMPACT (Universidade do Algarve). In general Fished zones showed decreased heterogeneity and although the results of the multivariate analysis support a significant difference between Fished and Non-fished areas the comparisons of the biodiversity (number of families, H’, EF(n)), density and biomass in Fished and Non-fished zones are inconclusive, inconsistent or even contradict most of the literature predictions. When the trophic structure and life style spectra of the assemblages are compared the decreased heterogeneity of the Fished zones is confirmed but other patterns emerge such as the higher relative contribution of free living organisms, especially meiofaunal predators, grazers and browsers in Fished zones in contrast with the higher relative contribution of tubiculous animals in Non-fished zones, the dominance of deposit feeders over detritus feeders in Fished areas and the presence of large suspension feeders in Non-fished zones. The interpretation of the observed taxonomic and trophic structure of the assemblages is complex and must take into account sources of variability introduced by unwanted alterations of the sampling strategy and habitat heterogeneities in the study area. Overall this study constitutes a good asset for the knowledge of bottom trawling impact on macrofaunal assemblages from deep-sea habitats. It is at this point impossible to estimate the impact of 60 years of bottom trawling and regular monitoring studies are desirable. Some methodological issues arose which can be used as recommendations for future assessments of trawling impacts and monitoring of seafloor integrity: selection of adequate control area(s) must consider habitat heterogeneity, selection of the sampling gear must consider the possible selectivity of smaller samplers; the number of replicates per stations should be sufficiently large to ensure representativeness of biodiversity, abundance and biomass assessment and significance of the comparative tests; and finally, trophic structure, life style and body size spectra showed to be good indicators of change and therefore they should become a more common tool on the assessment of trawling impact.
Ao longo do tempo, as artes de pesca têm vindo a evoluir como resposta às crescentes necessidades da população Humana. Ao mesmo tempo que a indústria pesqueira tem vindo a crescer têm-se vindo a observar importantes mudanças nos ecossistemas marinhos (ex. sobreexploração de recursos pesqueiros e perda ou degradação da biodiversidade). A sobre-pesca, pesca de espécies acessórias, rejeições e pesca fantasma são os impactos causados pelas pescas que geram maior preocupação, mas o efeito devastador de pesca de arrasto no fundo oceânico não deve ser subestimado, devido ao seu reconhecido impacto nas comunidades bentónicas. Até aos dias de hoje o conhecimento acerca do impacto em comunidades bentónicas de mar profundo é escasso na Europa e ainda menor em fundos oceânicos Portugueses. Contudo, a avaliação dos impactos da indústria pesqueira em fundos marinhos e nos seus ecossistemas é essencial para obter uma gestão apropriada do setor e para um uso mais sustentável dos recursos biológicos. Neste contexto, este estudo tem como objectivo avaliar o impacto da contínua pressão das pescas de arrasto em comunidades de macrofauna bentónica em fundos lamosos de mar profundo nos habitats do crustáceo Nephrops norvegicus (Lagostim), através da comparação de fundos impactados com fundos nãoimpactados, considerando a análise da biodiversidade, densidade, biomassa, estrutura trófica, espectro de tamanhos e modos de vida. Foram estudadas sete estações ao longo de um transeto, das quais, as primeiras duas estações (estações 1 e 2, área 1) correspondem a uma zona impactada, as seguintes três estações a uma zona não sujeita a pesca de arrasto (estações 3, 4 e 5, área 2,) e, por fim, duas estações (estações 6 e 7, área 3) novamente sujeitas a pressões de pesca de arrasto. A expedição oceanográfica foi realizada em Setembro de 2012 a bordo do navio RV Garcia del Cid (Consejo Superior de Investigaciones Cientificas) inserido no projecto IMPACT (Universidade do Algarve). De um modo geral, as zonas pescadas mostram uma menor heterogeneidade e embora os resultados da análise multivariada suportem uma diferença significante entre zonas pescadas e não-pescadas, as comparações de biodiversidade (número de familias, H’, EF(n)), densidade e biomassa) em zonas pescadas e não-pescadas são inconclusivas, inconsistentes e por vezes contraditórias quando comparadas com a literatura. Quando a estrutura trófica e o estilo de vida das comunidades são comparados, a pequena heterogeneidade nas zonas pescadas é confirmada, mas outros factores emergem, como a contribuição de animais de mobilidade livre, especialmente predadores de meiofauna e raspadores em zonas pescadas, em contraste com a alta contribuição de animais tubículos em zonas não-pescadas, a dominância de detritívoros que se alimentam de matéria orgânica associada ao sedimento sobre detritívoros que se alimentam de matéria orgânica particulada, em zonas pescadas e a presença de grandes suspensívoros em zonas não-pescadas. A interpretação dos resultados taxonómicos e da estrutura trófica é complexa e deve ter em conta variações introduzidas por alterações não esperadas na estratégia de amostragem e diferenças de habitat das zonas estudadas. No geral, este estudo contribui para o conhecimento do impacto de pescas de arrasto em comunidades de macrofauna bentónica de ambientes marinhos profundos. Nestas condições é dificil avaliar quais os efeitos de 60 anos de pressões de pesca de arrasto e futuros estudos são desejáveis. Surgiram alguns problemas metodológicos, o que pode servir como recomendações para futuros estudos de impactos de pesca de arrasto e monitorização da integridade dos fundos oceânicos: uma boa selecção de áreas controlo deve ser considerada; a seleção de tipos de amostradores deve ter em conta a selectividade de amostradores menores; o número de réplicas por estação deve ser suficiente para garantir representatividade da biodiversidade, abundância e biomassa, e a significância de testes comparativos; e por fim, estrutura trófica, espetro de tamanhos e modo de vida mostraram ser bons indicadores de diferenças entre as duas zonas, logo deveriam ser usados mais regularmente na avaliação de impactos de pesca de arrasto.
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Bloomfield, Helen J. "Compliance and control : a multidisciplinary assessment of prohibited trawling areas." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613446.

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Stella, Leonie C. "Trawling Deeper Seas: the Gendered Production of Seafood in Western Australia." Murdoch University, 1998. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040913.155811.

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This thesis explores the sexual division of labour in three worksites associated with the Western Australian Fishing industry: fishers' households, a seafood processing company and fishing vessels. There has been no previous substantial study of the labour of women in Australian fishing industries. My research has been primarily undertaken by interviewing women and men who work in the Western Australian fishing industry, and my findings are presented through a comparison with overseas literature relative to each site. As I found, in the households of fishermen, women do unpaid and undervalued labour which includes servicing men and children; managing household finances and operating fishing enterprises. In seafood processing companies women are allocated the lowest paid and least rewarding work which is regarded as "women's work". On-the factory floor issues of class, race/ ethnicity and gender intersect so that the majority of women employed in hands-on processing work are migrant women froma non-English speaking background. The majority of women who work at sea are cook/ deckhands who are confronted by a rigid sexual division of labour, and work in a hyper-masculine workplace. The few other women who have found a niche which enables them to enjoy an outdoor lifestyle while they earn their own living, are those who work as autonomous independent small boat fishers. In each site there is evidence that women, individually and collectively, exercise some power in determining how and where they work, but they remain marginalised from the more lucrative sites of the industry, and have limited access to economic and social power.
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Stella, Leonie. "Trawling deeper seas : the gendered production of seafood in Western Australia /." Access via Murdoch University Digital Theses Project, 1998. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040913.155811.

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Magorrian, Bridgeen Helen. "The impact of commercial trawling on the benthos of Strangford Lough." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318751.

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Britton, Adam Robert Corden. "Flight performance, echolocation and prey capture behaviour in trawling Myotis bats." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319104.

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Houston, Robert Duncan. "Prey detection and evaluation by echolocation in aerial feeding and trawling bats." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313009.

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Books on the topic "Trawling"

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Nicklin, John. Trawling with the lid off. Bolton: Aurora, 1996.

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Richard, George. An assessment of trawling technology in Canada. Ottawa: Program Planning and Coordination, Fisheries Management, Fisheries and Oceans Canada, 1999.

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Mbuga, James Siwo. Trawling in Lake Victoria: Its history, status, and effects. Nairobi, Kenya: IUCN Eastern Africa Regional Office, 1998.

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Tax arbitrage: The trawling of the international tax system. London: Spiramus Press, 2011.

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Raja, B. T. Anthony. High-opening bottom trawling in Tamil Nadu, Gujarat and Orissa, India: A summary of effort and impact. Madras: Development of Small-Scale Fisheries in the Bay of Bengal, 1987., 1987.

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Evans, David O. A bridle-less trawl and fine-mesh purse seine for sampling pelagic coregonine larvae with observations of spatial distribution and abundance. Toronto: Ontario, Ministry of Natural Resources, Fisheries Branch, 1988.

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Brabant, Jean-Claude. Les chaluts: Conception, construction, mise en œuvre. Plouzané [France]: IFREMER, 1988.

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Fournier, Denis. Recueil de données: Campagne de chalutage à la rencontre de l'estuaire fluvial et moyen du Saint-Laurent en 2001. Québec: Société de la faune et des parcs du Québec, 2002.

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Deschamps, Gérard. Les chaluts. Plouzané, France: Ifremer, 2003.

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Clark, William G. Washington's trawl logbook data, past and present. Olympia, WA: State of Washington, Dept. of Fisheries, 1986.

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Book chapters on the topic "Trawling"

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Tang, Ying, Xinsheng Yu, and Ni Wang. "Trawling Pattern Analysis with Neural Classifier." In Lecture Notes in Computer Science, 598–601. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11881070_81.

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McLoughlin, John. "Trawling for flat superficial bladder tumour." In Top Tips in Urology, 173–74. Oxford: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118508060.ch109.

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Gunnarsson, Guđmunder. "Deep-Water Trawling Techniques Used by Icelandic Fishermen." In Deep-Water Fisheries of the North Atlantic Oceanic Slope, 385–95. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8414-2_19.

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Menzies, Robert J. "Improved Techniques for Benthic Trawling at Depths Greater than 2000 Meters." In Biology of the Antarctic Seas, 93–109. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar001p0093.

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He, Pingguo, and Paul D. Winger. "Effect of Trawling on the Seabed and Mitigation Measures to Reduce Impact." In Behavior of Marine Fishes, 295–314. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9780813810966.ch12.

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Turner, George F., Denis Tweddle, and Ramsey D. Makwinja. "Changes in demersal cichlid communities as a result of trawling in southern Lake Malaŵi." In The Impact of Species Changes in African Lakes, 397–412. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0563-7_18.

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Hareide, Nils-Roar. "Comparisons between Longlining and Trawling for Deep-Water Species — Selectivity, Quality and Catchability — A Review." In Deep-Water Fisheries of the North Atlantic Oceanic Slope, 227–34. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8414-2_7.

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Campbell, Susan. "Ecological specialisation and conservation of Australia's Large-footed Myotis: a review of trawling bat behaviour." In The Biology and Conservation of Australasian Bats, 72–85. P.O. Box 20, Mosman NSW 2088, Australia: Royal Zoological Society of New South Wales, 2011. http://dx.doi.org/10.7882/fs.2011.010.

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Byrne, Jo. "Hull, Fishing and the Life and Death of Trawlertown: Living the Spaces of a Trawling Port-City." In Port Towns and Urban Cultures, 243–63. London: Palgrave Macmillan UK, 2016. http://dx.doi.org/10.1057/978-1-137-48316-4_13.

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Ramos-EsplÁ, Alfonso A., Juan E. GuillÉn, Just T. Bayle, and Pablo SÁnchez-JÉrez. "Artificial Anti-trawling Reefs off Alicante, South- Eastern Iberian Peninsula: Evolution of Reef Block and Set Designs." In Artificial Reefs in European Seas, 195–218. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4215-1_12.

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Conference papers on the topic "Trawling"

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West, B. "1986 Bering Sea Trawling Impact Project." In OCEANS '87. IEEE, 1987. http://dx.doi.org/10.1109/oceans.1987.1160761.

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Yu, Xinsheng, Dejun Gong, Ying Tang, and Ni Wang. "Detection of Trawling Patterns in Seabed Images." In OCEANS 2006. IEEE, 2006. http://dx.doi.org/10.1109/oceans.2006.306901.

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Wu, Jie, Chittiappa Muthanna, Hagbart Alsos, Rasmus Juhlin, and Daniel Karunakaran. "Experimental Investigation of Over-Trawlability of an Innovative Arctic Subsea Production Unit (SPU)." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95503.

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Abstract Model tests have been performed to examine the overtrawlability of Subsea7’s Subsea Production Unit (SPU) in SINTEF Ocean’s Ocean Laboratory in November/December 2017. In this test campaign, 50 tests with different SPU orientations and trawling equipment were carried out. Two trawling water depth (100 m and 500 m) were simulated in the model test. Two types of trawl door, i.e. Thyborøn (5.5t) and Poly Ice (3.8t), with Selstad No. 620 type fishing net were used in present test. Overtrawling with a roller clump (7.6t) was also tested. Two trawling speeds of 1.6 m/s and 2.6 m/s and 5 SPU orientations were examined. Force measurements both on the fishing lines, and directly measured on the SPU were used to determine overtrawlability of the SPU. The dynamometer used in present test to measure the forces directly on the SPU is the first time that this type of measurement has been undertaken at SINTEF Ocean at the Ocean Basin facility with fully modelled trawling gear.
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Wu, Xiaopeng, Vegard Longva, Svein Sævik, and Torgeir Moan. "Simulation of Hooking Event in Fish Trawling Operation." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10490.

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Interference between trawl gears and subsea pipelines is an important issue. A special case called hooking, defined as the situation when the trawl gear gets “stuck” under the pipeline, should be a rarely occurring situation. In this case, however, the warp line tension could be high as its breaking strength. This may be detrimental with respect to both fishing vessel safety and pipeline integrity. This calls for a better understanding of the hooking phenomenon. The goal of this study is to develop a proper numerical model to describe the hooking event. The proposed model is based on the finite element method. A special penalty-based contact element that includes the friction effect is utilized to deal with the trawl board and pipeline interaction. The trawl board and seabed (span shoulder) contact is also accounted for in order to simulate the hooking event. To validate the proposed model, numerical simulation results are compared with previous model test results. A rectangular type trawl board was selected as the target object. The pull-over cases with different span height were firstly tested and compared. Then, the hooking event set-ups were modeled. Based on the model tests, there are two most likely scenarios for hooking: 1) a de-stabilized trawl board with small span height; 2) small crossing angle with large span height. The above two cases were both tested by the proposed model. In the first case, the trawl board is towed flat on the seabed. Permanent hooking was successfully obtained in the simulation. Then, two cases with small crossing angle were studied. Hooking event was reproduced in the case of a 20 degree crossing angle by introducing a disturbance on the trawl board. It shows that the proposed model could reproduce the hooking event, provided that the trawl board motion similar to the model test could be obtained. This gives a good basis for further studies.
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Biryukov, A., I. Pustogarov, and R. Weinmann. "Trawling for Tor Hidden Services: Detection, Measurement, Deanonymization." In 2013 IEEE Symposium on Security and Privacy (SP) Conference. IEEE, 2013. http://dx.doi.org/10.1109/sp.2013.15.

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Masu, Lorenzo, Leonardo Cardinali, and Stefania Benucci. "Scraping Damage Hazard Due to Trawling Interference on Subsea Pipelines." In Proceedings of the 29th European Safety and Reliability Conference (ESREL). Singapore: Research Publishing Services, 2020. http://dx.doi.org/10.3850/978-981-14-8593-0_4064-cd.

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Balash, Cheslav, David Sterling, Matt Broadhurst, Arno Dubois, and Morgan Behrel. "Hydrodynamic Evaluation of a Generic Sail Used in an Innovative Prawn-Trawl Otter Board." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41335.

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In prawn-trawling operations, otter boards provide the horizontal force required to maintain net openings, and are typically low aspect ratio (∼0.5) flat plates operating on the seabed at high angles of attack (AOA; 35–40°). Such characteristics cause otter boards to account for up to 30% of the total trawling resistance, including that from the vessel. A recent innovation is the batwing otter board, which is designed to spread trawls with substantially less towing resistance and benthic impacts. A key design feature is the use of a sail, instead of a flat plate, as the hydrodynamic foil. The superior drag and benthic performance of the batwing is achieved by (i) successful operation at an AOA of ∼20° and (ii) having the heavy sea floor contact shoe in line with the direction of tow. This study investigated the hydrodynamic characteristics of a generic sail by varying its twist and camber, to identify optimal settings for maximum spreading efficiency and stability. Loads in six degrees of freedom were measured at AOAs between 0 and 40° in a flume tank at a constant flow velocity, and with five combinations of twist and camber. The results showed that for the studied sail, the design AOA (20°) provides a suitable compromise between greater efficiency (occurring at lower AOAs) and greater effectiveness (occurring at higher AOAs). At optimum settings (20°, medium camber and twist), a lift-to-drag ratio >3 was achieved, which is ∼3 times more than that of contemporary prawn-trawling otter boards. Such a result implies relative drag reductions of 10–20% for trawling systems, depending on the rig configuration.
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Galdelli, A., A. Mancini, A. N. Tassetti, C. Ferrà Vega, E. Armelloni, G. Scarcella, G. Fabi, and P. Zingaretti. "A Cloud Computing Architecture to Map Trawling Activities Using Positioning Data." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97779.

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Abstract Descriptive and spatially-explicit information on fisheries plays a key role for an efficient integrated management of the maritime activities and the sustainable use of marine resources. However, this information is today still hard to obtain and, consequently, is a major issue for implementing Marine Spatial Planning (MSP). Since 2002, the Automatic Identification System (AIS) has been undergoing a major development allowing now for a real time geo-tracking and identification of equipped vessels of more than 15m in length overall (LOA) and, if properly processed, for the production of adequate information for MSP. Such monitoring systems or other low-cost and low-burden solutions are still missing for small vessels (LOA < 12m), whose catches and fishing effort remain spatially unassessed and, hence, unregulated. In this context, we propose an architecture to process vessel tracking data, understand the behaviour of trawling fleets and map related fishing activities. It could be used to process not only AIS data but also positioning data from other low cost systems as IoT sensors that share their position over LoRa and 2G/3G/4G links. Analysis gives back important and verified data (overall accuracy of 92% for trawlers) and opens up development perspectives for monitoring small scale fisheries, helping hence to fill fishery data gaps and obtain a clearer picture of the fishing grounds as a whole.
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Polanco-Loria, Mario A., Håvar Ilstad, and Erik Levold. "A Numerical-Experimental Approach of Indentation Problem: Part I — Force-Dent Response of Steel Pipes." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61890.

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Accidents by trawling impact have the potential of environmental consequences, in terms of safety, monetary values and reputation. Aware of this situation a technology development plan on “Pipeline subject to high interference loads” has been established at STATOIL in close collaboration with GASSCO. The overall achievement is to adapt and introduce more reliable assessment methods in the load and response of pipelines under a trawling impact scenario. This work includes a review of some known force-indentation models appeared in the literature. Some comments on the recently updated version of the DNV-RP-F111 document. Next, the description of the numerical results of 12 analyses of steel pipes studied is described and based on these results a new force-dent proposal is presented. The proposed equations are validated against experimental tests and the findings indicated fairly good predictions as indicated in the conclusions.
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Dolev, Shlomi, Yuval Elovici, Alex Kesselman, and Polina Zilberman. "Trawling Traffic under Attack, Overcoming DDoS Attacks by Target-Controlled Traffic Filtering." In 2009 International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT). IEEE, 2009. http://dx.doi.org/10.1109/pdcat.2009.40.

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Reports on the topic "Trawling"

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Turenhout, M. N. J., B. W. Zaalmink, W. J. Strietman, and K. G. Hamon. Pulse trawling in the Netherlands : economic and spatial impact study. Wageningen: Wageningen Economic Research, 2016. http://dx.doi.org/10.18174/396469.

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van de Wolfshaar, K. E., T. van Kooten, and A. D. Rijnsdorp. Lethal and non-lethal effects of trawling on the benthic invertebrate food web. Den Helder: Wageningen Marine Research, 2020. http://dx.doi.org/10.18174/514206.

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Schram, Edward, and Pieke Molenaar. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/504087.

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Schram, Edward, Pieke Molenaar, and Susan de Koning. Direct mortality among demersal fish and benthic organisms in the wake of pulse trawling. IJmuiden: Wageningen Marine Research, 2021. http://dx.doi.org/10.18174/541793.

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Hintzen, Niels, and Ulrika Beier. Predicting benthic fauna biomass in the Voordelta under different hypothetical fisheries regimes : Could an expected increase in benthic fauna have occurred within an area protected from demersal trawling if shrimp fisheries should not have increased? IJmuiden: Wageningen Marine Research, 2019. http://dx.doi.org/10.18174/499289.

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