Relevant bibliographies by topics / Effect of fishing on

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Academic literature on the topic 'Effect of fishing on'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Effect of fishing on"

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Aida, Gilang Rusrita, Rhochmad Wahyu Illahi, and Tyas Dita Pramesthy. "Analisys of The Effect of Fisherman, Fishing Boat, and Fishery Ports on Catching Fisheries Production in East Java Province." Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan 5, no. 1 (April 30, 2023): 35–44. http://dx.doi.org/10.47685/barakuda45.v5i1.338.

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The importance of the fisheries sector for East Java Province can be seen from the high capture fisheries production compared to other provinces di Indonesia. In 2021, East Java Province is listed as the province with the highest capture fisheries production in Indonesia. This is suspected to be affected by several factors i.e the numberi of fishermen, fishing vessels, and fishing ports, so analysis is needed to determinei the effect of these factors on capture fisheries in East Java. The aim of this studyi was to determine the effect of the amount of fishermen, fishing boats, and fishing ports on capture fisheries production in East Java. The research methodi used in this research iis descriptive using secondary data. The data analysis used is multiplei linear regression, F-test, and T-test. Based on the results, the multiple linear regression analysis were obtained by the equation y = 292.543,118 + 0,381 X1-0,722 X2 + 2.838,450 X3 with an adjusted R2 value of 72,7 %. The F test shows a isignificance <0,05, which meansi that the total number of fishermen, fishing boats, and fishing ports have a significant effecti simultaneously on capture fisheries production in East Java. The T-test shows that the numberi of fishing ports has a partially significant effect on marine capture fisheries production in East Java Province (sig. <0,05). Meanwhile, the number ofi fishermen and fishingi boats showed no partially significant effect oni capture fisheriesi production in East Java Province (sig. > 0,05).
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PAN, QIUHUI, MENGPING LI, MINGFENG HE, and XIAOJIA MU. "THE EFFECT OF "CLOSED FISHING" IN CHINA." International Journal of Modern Physics C 18, no. 03 (March 2007): 391–98. http://dx.doi.org/10.1142/s0129183107010504.

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A fishing model is presented in this paper. A year is divided into four seasons on the basis of the Penna model. We define the rules of death, reproduction, fishing and so on for fish. And "closed fishing" in China is introduced in this model. Then we discuss the population size of fish and the fishing products in the case of "closed fishing" or not. At last the conclusion is obtained that the policy will be significant if fishing intensity is in a certain range. And reducing fishing intensity is essential policy, and "closed fishing" is just an accessorial policy.
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Zhou, Yanheng, and Zhineng Hu. "The Preventive Effect of Outdoor Recreational Fishing on Anxiety Disorder." E3S Web of Conferences 409 (2023): 06001. http://dx.doi.org/10.1051/e3sconf/202340906001.

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Background: Anxiety disorder, a severe global public health problem, has caused many adverse effects. Effectively preventing anxiety disorder is very important. This paper chose recreational fishing as an intervention measure to explore its effect on preventing anxiety disorder. Methods: The prevention effect of recreational fishing on anxiety disorder and the heterogeneity of this effect were analyzed through the ordinal logistic regression model. The robustness of the main results was tested through the multiple linear regression models. Results: “Fishing” significantly affected the anxiety level of residents. Compared with those who did not participate in outdoor recreational fishing, for those who participated there is a 3.494 decrease in the log odds of being in a higher severity of the anxiety level. With the increase in age, the negative effect of recreational fishing on anxiety levels was significantly lower. Conclusion: We focused on the preventive effect of outdoor recreational fishing on anxiety, contributing to add some evidence for non-medical measures to prevent anxiety disorder. Participation in outdoor recreational fishing has a significant prevention effect on anxiety disorder. Older people have less effect in preventing anxiety disorder by participating in fishing.
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Thorlindsson, Thorolfur. "The Skipper Effect in the Icelandic Herring Fishery." Human Organization 47, no. 3 (September 1, 1988): 199–212. http://dx.doi.org/10.17730/humo.47.3.1584t42x24702552.

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The centrality of the skipper to the economic and social organization of fishing is based on the assumption that he plays an important role in fishing success. This crucial assumption has recently been hotly debated in the social science literature in various contexts. In this study an attempt is made to estimate the role of the skipper in fishing success. The study is based on data from the Icelandic summer herring fishery from the years 1959, 1960 and 1961. The analysis of the data shows a correlation ranging from .59 to .70 for the skippers' catches between fishing seasons. When relevant variables—size of boat and time spent fishing—are controlled for, correlation for skippers' catches between seasons remains high (Beta = .52 and .53). Further, analysis of case histories of individual skippers and other qualitative evidence support the view that the skipper plays a central role in fishing success. Finally, results are discussed in the context of current social science debate around the folk belief in the skipper effect.
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Ralston, Stephen, and Michael R. O’Farrell. "Spatial variation in fishing intensity and its effect on yield." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 4 (April 1, 2008): 588–99. http://dx.doi.org/10.1139/f07-174.

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Fishing mortality is rarely, if ever, evenly distributed over space, yet this is a common assumption of many fisheries models. To evaluate the effect of spatial heterogeneity in fishing mortality on yield, we constructed age-structured models that allowed for differing levels of fishing in three regions within the boundaries of a stock and explored alternative assumptions about the life stage in which density-dependent compensation operates. If the fishing mortality rate (F) is not excessive (i.e., F ≤ FMSY defined for the spatially homogeneous case; MSY, maximum sustainable yield), simulations demonstrated that minor to moderate spatial variation in fishing intensity does not impact sustainable yield. However, if fishing mortality is excessive (F > FMSY), spatial variation in fishing intensity often improves yield and can actually produce yields in excess of MSY when compensation occurs after dispersal, and the density-dependent recruitment rate is a function of the local density of adults. The yield premium generated in these simulations by postdispersal density dependence is due to a low level of compensatory mortality in heavily fished areas coupled with dispersal of propagules into these areas from lightly fished adjacent regions.
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Soeprijadi, Liliek, Endang Yuli, Edi Susilo, and Rudianto Rudianto. "Model Joint Business Group Based Knowledge for Fishermen Community Empowerment Strategies (Case Study of Business Diversification on Solid Capture Region Cirebon City)." Business and Management Horizons 1, no. 1 (April 5, 2013): 96. http://dx.doi.org/10.5296/bmh.v1i1.3485.

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The purpose of this study was to analyze the effect of public capital fishing, fish processing business and micro-business skills to the programs and activities of the agency joint venture (KUB) coastal fishing town of Cirebon: to analyze the effect of public capital fishing, fish processing business and micro-enterprise skills through the agency the joint venture (KUB) fisherman exchange coastal fishing town of Cirebon: to analyze the effect of public capital fishing, fish processing business and micro-enterprise skills through a joint venture group institutions (KUB) and exchange fishing to conservation of fish resources in the coastal city of Cirebon , and to formulate a model of the joint venture (KUB) knowledge as a strategy of empowerment of fishing communities in the city of Cirebon. Analysis of regression weights measurement models with business groups (KUB) based knowledge as a fishing community empowerment strategy was as follows: capital fishing communities and micro-enterprise skills significantly influence the institutional joint venture (KUB) Cirebon fishermen. While the fish processing business variables didn’t significantly influence the institutional joint venture (KUB) Cirebon fishermen; stock fishing communities, fish processing business and micro-enterprise skills together through the institution of the joint venture (KUB) fisherman significant effect on the value of rate of coastal fishing town of Cirebon. While the partial correlation between public capital fishing, fish processing business and micro-enterprise skills exchange coastal fishing town of Cirebon was not significant; stock fishing communities, fish processing business and micro-enterprise skills together through the institution of the joint venture (KUB) and exchange rates have a significant effect fishing conservation of coastal fish resources Cirebon. While the partial correlation between public capital fishing, fish processing business and micro-business skills for the preservation of coastal fishery resources Cirebon was not significant, and KUB institutional model based knowledge capital in the form of fishing communities, fish processing business and micro-enterprise skills through a strategy of empowerment fishing communities significantly influence conservation of fish resources in coastal city of Cirebon.
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Cheon, Deok Hee, and Young Kwan Lee. "Effects of Fishing Village Tourism Motivation on Destination Image, Traveler Satisfaction and Loyalty." Convergence Tourism Contents Society 9, no. 2 (August 31, 2023): 191–204. http://dx.doi.org/10.22556/jctc.2023.9.2.191.

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Purpose Fishing village tourism is a form of tourism that has been newly started according to the economic revitalization of underdeveloped fishing villages, the increase in leisure time and income of tourists, and the diversification of tourism needs. In order to maintain sustainable fishing village tourism, it is necessary to identify what motives tourists participate in fishing village tourism and to empirically study the effects of these motivation factors on destination image and tourist satisfaction and loyalty. Methods A survey was conducted on tourists who visited Daeyado, Yongshin, and Gagyeongju fishing villages located in Taean, which are representative tourist destinations in the west coast, and 176 questionnaires were used for empirical analysis. Results As a result of factor analysis, motivation for fishing village tourism was classified into five factors: nature appreciation, eating and purchasing marine products, family relations and rest, fishing village experience, and marine leisure sports experience, and destination image and traveler satisfaction and loyalty were each classified as a single dimension. As a result of the hypothesis verification, among the motives for fishing village tourism, factors such as family relations and rest, eating and purchasing marine products, nature appreciation, and marine leisure sports experience had a significant effect on the destination image, and fishing village experience, nature appreciation, and marine leisure sports experience factors had a significant effect on traveler satisfaction. It was verified that the destination image had a significant effect on traveler satisfaction and loyalty, and traveler satisfaction had a significant effect on loyalty. Conclusion In the end, it was studied that a good destination image can be planted according to the motive of fishing village tourism, and the loyalty of revisit, word of mouth, and recommendation can be increased by increasing the satisfaction of travelers.
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Marchal, Paul, Bo Andersen, David Bromley, Ane Iriondo, Stéphanie Mahévas, Floor Quirijns, Brian Rackham, Marina Santurtún, Nicola Tien, and Clara Ulrich. "Improving the definition of fishing effort for important European fleets by accounting for the skipper effect." Canadian Journal of Fisheries and Aquatic Sciences 63, no. 3 (March 1, 2006): 510–33. http://dx.doi.org/10.1139/f05-238.

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The scope of this paper is to quantify, for a wide selection of European fisheries, fishing tactics and strategies and to evaluate the benefits of adjusting the definition of fishing effort using these elements. Fishing tactics and strategies were identified by métiers choices and a series of indices. These indices have been derived to reflect shifts in tactics (within a fishing trip) and in strategies (within a year). The Shannon–Wiener spatial diversity indices of fishing tactics (FT_SW) and strategies (YE_SW) had the greatest impact on catch rates. In particular, FT_SW was always negatively correlated to catch rates. One may anticipate that during a fishing trip, vessels with high FT_SW have been searching fish aggregations for a long time, while vessels with low FT_SW have been more efficient in finding these aggregations. The linkage between YE_SW and catch rates was of a more complex nature. Adjusting fishing effort by means of (i) the métier effect and (ii) the indices of tactics and strategies generally led to a substantial gain in the precision of the relationship between fishing mortality and fishing effort.
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Lee, Sangheon, Yukio Akiba, Tateki Kurosu, and Masamori Iida. "Effect of Ag2O on fishing effect of bipbsrcacuo superconductor." Electronics and Communications in Japan (Part II: Electronics) 76, no. 8 (1993): 99–109. http://dx.doi.org/10.1002/ecjb.4420760810.

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Rochet, Marie-Joëlle, and Verena M. Trenkel. "Which community indicators can measure the impact of fishing? A review and proposals." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 1 (January 1, 2003): 86–99. http://dx.doi.org/10.1139/f02-164.

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Population and community descriptors that might be used as indicators of the impact of fishing are reviewed. The criteria used for the evaluation of these indicators are meaning, expected effect of fishing, exclusiveness to fishing effects, and measurability. Population indicators such as total mortality rate, exploitation rate, or average length are the most operational indicators because their meaning is clear and the expected effect of fishing on them is well understood so that reference points can be set. On the other hand, indicators based on the composition of species assemblages such as diversity indices and ordination of species abundances are difficult to interpret, and the effect of fishing on them is not easily predicted. Robust indicators describing the community functions of interest (production and transfer of biomass to large fish), such as size spectra descriptors or the proportion of piscivorous fish in the community, are more promising but are not yet well developed. New candidate indicators are proposed: the change in fishing mortality required to reverse population growth rate, the proportion of noncommercial species in the community, and the average length and weight in the community.
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Dissertations / Theses on the topic "Effect of fishing on"

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Bridson, Jessica. "The effect of fishing on the evolution of North Sea Cod." Thesis, University of Strathclyde, 2001. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=9352.

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Nimick, Aileen Margaret. "Modelling Fishing Gear to Address "More than Minimal and Not Temporary" Fishing Effects to Essential Fish Habitat." Thesis, Alaska Pacific University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10845718.

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The Magnuson-Stevens Fishery Conservation and Management Act (MSA; Magnuson-Stevens Fishery Conservation and Management Act. 2014. (16 U.S.C. 1801–1891(d)) mandates that fisheries management councils in the United States prevent adverse, or “more than minimal and not temporary”, fishing effects to essential fish habitat (EFH) to the extent practicable. Councils were left to decide what effects qualified as “minimal” and “temporary”. The lack of explicit definition in the MSA and its accompanying Final Rule has resulted in inconsistent habitat management throughout the country. The EFH mandate was written under an implicit assumption that councils have the scientific information necessary to effectively manage EFH. Basic information is lacking, such as what type of habitat occurs where, and how fishing effects habitat features. Chapter 1 briefly reviews the history of EFH regulation, the consequences of regulatory ambiguities and information gaps, and highlights that high latitude fisheries management can be disproportionately affected by climate variability. Thus, requiring investment in baseline habitat assessment and monitoring and renewed focus on under developed areas of research e.g. Fishing effects and gear-habitat interactions.

Councils have attempting to quantitatively describe fishing effects to EFH through the use of mathematical models. The most recent of which, the Fishing Effects (FE) Model, was used in the North Pacific Fisheries Management Council 2015 EFH Review cycle. The FE Model uses discrete time steps (monthly) and spatially explicit fishing effort and sediment data to calculate an estimated habitat disturbance. The FE Model is calculated in two-dimensions and implicitly assumes that if fishing gear does not contact the seabed, then there is no gear-habitat interaction. Some features stand taller than raised gear (e.g. sea whips, Halipteris willemoesi, in the North Pacific can up to 2m tall) and may interact with fishing gear. The FE Model in two-dimensions does not account for this potential interaction and cannot effectively simulate gear modifications. Chapter 2 proposes an adapted version of the FE Model that accounts for the vertical interactions through the use of discrete height bins. To accurately estimate interactions on and above the seabed, fishing gear has to be recharacterized. To demonstrate this the Bering Sea flatfish trawl was recharacterized by calculating how much of the nominal gear width is present in each height bin. A detailed methodology is provided to allow this method to be applied to any fishing gear. The adapted FE Model can be used to simulate gear modifications, as is shown by simulating two modifications of the flatfish trawl. This chapter will inform the 2020 EFH Review cycle as the FE Model is improved.

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Modig, Karl Johan. "Selective fishing gear : A review on the effects of selective fishing gear on cod in the Baltic Sea." Thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-31302.

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The populations of Atlantic cod (Gadus morhua) in the Baltic Sea has been heavily exploited for decades, with fishing mortalities close to, and for several occasions, even above one. The larger part of the spawning stock biomass is consequently being removed each year. The issue of fisheries induced evolution (FIE) has been gaining attention from researchers lately. The selection pressure driving this evolution is powered by a connection between high mortality rates and heritable traits. The fishing in the Baltic Sea is mainly performed with size selective gear that can impose selection on traits like size-at-age or size-at-maturity. In this review I show how FIE may affect the Baltic cod towards decreased size-at-age/maturity and how size selective fishing on stocks at low levels can increase the inherent instability of the population as well as deprave the Baltic Sea of ecosystemic services from cod.
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Ricks, Benjamin Riddick Maceina Michael J. "The effects of tournament fishing on dispersal, population characteristics, and mortaltiy of black bass in Lake Martin, Alabama." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/RICKS_BENJAMIN_26.pdf.

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Miller, Nathan. "The Gulf of Mexico Red Snapper Individual Fishing Quota Program: The Effects on the Fishing Industry and Potential Outlook." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3626.

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In January 2007, the Gulf of Mexico red snapper fishery took a step toward sustainability and began management under an individual fishing quota (IFQ) system. The hope is that direct ownership stakes by fishers brings more direct involvement on behalf of the boat owners and fishermen as well as more responsible and sustainable fishing practices on depressed fish populations. The research was conducted in order to study the welfare of local fishing communities as well as the effects on the red snapper fishery itself. Traditional fisheries and economic data were analyzed. In addition a Data Envelopment Analysis (DEA) of the Florida Gulf Coast communities involved in the red snapper fishery was performed to compare to the analysis of fishing communities prepared by the National Marine Fisheries Service (NMFS). Finally, online and phone surveys of fishermen involved in the red snapper fishery were performed to gauge their responses to the change in management. The study reveals a strong correlation between the DEA analysis of fishing communities affected and the analysis performed by NMFS, and reinforces DEA as a method of determining involvement in a fishery. Additionally, the thesis indicates the red snapper IFQ has performed as expected in some areas by its supporters – an average gulf-wide ex-vessel price per pound increase of 10% in just three years; elimination of the rush to fish due to guaranteed quota; and a shift in fleet composition as the number of share owners owning less than 2.00% have dwindled, and the number of shareholders possessing greater than 2.00% of the quota has increased gulf-wide by 50%. However, in other areas such as effort reduction and bycatch rates, the IFQ appears to have mixed results. A reported decline in effort is likely attributable to a reduction in the overall gulf-wide red snapper quota between 2007 and 2008 rather than the IFQ, and even NMFS doubts the bycatch data that are being reported by fishermen. Most importantly, current IFQ shareholders were surveyed via phone and internet revealing not only an overall disapproval by most fishers of the IFQ design process, but also effects contrary to those publicized by IFQ supporters, and a general distrust in fisheries management.
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Søvik, Siri Lise. "Characterisation of enzymatic activities in by-products from cod species : effect of species, season and fishing ground." Doctoral thesis, Norwegian University of Science and Technology, Department of Biotechnology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1267.

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Westera, Mark B. "The effect of recreational fishing on targeted fishes and trophic structure, in a coral reef marine park." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2003. https://ro.ecu.edu.au/theses/1499.

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Recreational line fishing is highly targeted at predatory fishes, making them vulnerable to overfishing. These same fishes play a role in trophic structure by regulating prey species. Despite increasing numbers of fishers, few studies have investigated the potential effects of recreational fishing on fish populations and subsequent trophic effects. This project investigated whether there were differences in fishes and benthos between unfished and recreationally fished areas, and whether the removal of targeted fishes influenced trophic structure. The study was conducted at the Ningaloo Marine Park, Western Australia, which had Sanctuary (no-take) and Recreation {recreationally fished) Zones. Data were collected from three regions (Mandu, Osprey and Maud) and replicated over time. Fish assemblages, benthos and trophic interactions were compared between zones at each region. At Ningaloo the lethrinids (emperors) are a top-order predatory fish and the preferred target of recreational anglers. The algal-grazing urchin Echinometra mathaei comprised 51% of macro invertebrate abundances and was heavily preyed upon by lethrinids, being recorded in 50% of the guts of sampled fish. In nil regions, Sanctuary Zones had a greater biomass of lethrinids than Recreation Zones, but there were no differences in non-targeted fishes between zones. Despite the consistent effect on lethrinids, there were inconsistencies among regions in the predator-prey relationships. At Mandu, Echinometra mathaei abundances were inversely related to lethrinid biomass, suggesting a strong predator-prey interaction. In the Recreation Zone, the abundances of E. mathaei were four times greater, and macro-algal cover was half, that of the Sanctuary Zone. Furthermore, algal composition differed between zones, and this was driven by fucoid brown algae, which dominated the diets of E. mathaei. This was interpreted as evidence of a trophic cascade resulting from the removal of lethrinids at the Recreation Zone. At Maud, different results were recorded. Abundances of Echinometro mathaei and lethrinids were both higher in the Sanctuary Zone, than the adjacent Recreation Zone. E. mathaei reside in the crevices of rock, dead coral or Echinapora coral, which provided refuge from predation and this habitat was more available in the Sanctuary Zone. It is suggested that the availability of this habitat confounded the effects of predation. Macro- algal cover was lower in the Sanctuary Zone indicating a grazing effect from E. mathaei. At Osprey there was higher cover of E. mathaei habitat in the Sanctuary than the Recreation Zone. However, there were no differences in macro-algal cover, which was consistent with a lack of difference in E. mathaei abundances. The effect of E. mathaei grazing was unlikely to have been confounded by fishes that graze macro-algae, as they did not differ between zones at any region. These results indicate that recreational fishing reduced fish populations below that of adjacent protected areas at Ningaloo Marine Park, and in one region this resulted in a trophic cascade. This may be the first study that has recorded evidence of a trophic cascade where recreational line fishing is the only means of extraction. However, the results also show that this is not a consistent response to reduced fishing pressure; in other regions, changes in predatory fish abundance did not result in differences in the abundances of their prey, suggesting no trophic cascade. The studies have contributed towards an understanding of fish-habitat interactions and provide a baseline for future monitoring of the Ningaloo Marine Park. They also have important implications for marine park managers in terms of defining their expectations when implementing Sanctuary Zones. The results also show that Sanctuary Zones have the potential to be effective tools for fisheries management.
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Costa, André Bento. ""Fishing on Alentejo rocky shores - intensity, yield and protection effects"." Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/15861.

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Actividades de pesca são tradicionais em Portugal e, na costa sudoeste continental Portuguesa, os pescadores geralmente exploram zonas rochosas intertidais ou subtidais pouco profundas, capturando peixes teleósteos e diversos invertebrados marinhos. Desde 1995, que esta costa está parcialmente protegida por um parque natural (Parque Natural do Sudoeste Alentejano e Costa Vicentina - PNSACV). Uma série de medidas de gestão de pesca têm vindo a ser implementados desde 2006 e mais recentemente, foi adoptado um novo plano de ordenamento do parque natural, que acrescenta normas ainda mais restritivas. Este estudo tem como objectivo analisar a variação espacial e temporal da intensidade e do rendimento das actividades de pesca no litoral rochoso Alentejo e avaliar os efeitos das medidas de protecção implementadas a essas actividades. Foi também avaliada a opinião dos pescadores, sobre as leis de gestão de pesca existentes e foi caracterizada a sua actividade. Para a análise da intensidade de pesca foi utilizado o método de “roving creel survey”. O rendimento das actividades de pesca foi estimado através de entrevistas directas a pescadores e observações de 30 minutos a pescadores à linha. Informação relativa à opinião dos pescadores e caracterização das suas actividades foram obtidas através de inquéritos. O trabalho de campo decorreu entre Janeiro e Julho de 2012. A amostragem foi efectuada em seis áreas e estratificada por: tipo de dia (dias de semana, período semanal de interdição, fins-de-semana/feriados); áreas (fora do parque; dentro do parque); período de defeso do sargo (antes, durante, depois) e período da Páscoa (antes, durante, depois). Usando dados publicados anteriormente, foi realizada uma comparação interanual relativamente ao período da Páscoa entre os anos de 1995, 1996 e 2012 de forma a avaliar os efeitos das medidas de protecção. As principais actividades de pesca documentadas no litoral rochoso Alentejo foram a pesca à linha e o marisqueio. O valor médio global de intensidade para todas as actividades humanas foi de 1,32 utilizadores.km-1.dia-1. Foram registados valores globais superiores durante fins-de-semana e/ou feriados, especialmente em áreas fora do parque. Durante o período semanal de interdição as áreas do parque registaram uma diminuição significativa no número de pescadores.km-1. No entanto, durante o defeso do sargo, a redução esperada no número pescadores à linha não foi observada em áreas protegidas. Foi observado elevados valores de intensidade e predação total durante o período da Páscoa, evidenciado em anos anteriores à implementação das medidas de protecção. A comparação interanual revelou uma variação da intensidade de pesca entre área e períodos para todas as actividades. Foi obtido um rendimento de cerca de 3 toneladas de pescado (peixes e mariscos), proporcionando um rendimento médio de 0.15 kg.h-1 por pescador. As áreas do parque apresentaram um rendimento superior relativo à predação total. O valor de rendimento obtido com as entrevistas directas, a pescadores à linha foi aproximadamente o dobro do valor obtido com as observações de 30 minutos. Os pescadores do litoral rochoso Alentejano são maioritariamente do sexo masculino com idades superiores a 30 anos, estão empregados no sector industrial ou são reformados/desempregados/estudantes, residem ou possuem naturalidade em concelhos com territórios abrangidos pelo parque natural, e capturam sobretudo peixes teleósteos e mariscos. A maioria conhece as leis portuguesas relativas à pesca recreativa e as medidas de protecção implementadas no parque. As medidas de protecção que afectam as suas actividades mais mencionadas pelos pescadores são: todas as medidas, período de defeso do sargo, e tamanhos e pesos mínimos do pescado. Em sentido contrário os pescadores que concordam com as medidas de protecção referem que as medidas mais acertadas são: todos os períodos de defeso, obrigatoriedade de licenças de pesca e tamanhos mínimos do pescado. Embora as medidas de protecção, recentemente estabelecidas no parque natural possam ter causado uma certa redução da intensidade de pesca, ainda é prematuro concluir sobre a totalidade dos efeitos de tais medidas. Como tal, para analisar e avaliar os efeitos precisos de medidas de protecção é indispensável uma constante monitorização das actividades de pesca; ABSTRACT:Fishing activities are traditional in Portugal and, in the Southwest continental coast, fishermen generally exploit intertidal or shallow subtidal rocky shores targeting shellfish and teleost fishes. Since 1995, the Portuguese SW continental coast is partially protected by a natural park (Southwest Alentejo and Vicentine Coast Natural Park - PNSACV). In this park, a series of fishing management measures has been implemented since 2006 and, more recently, a new management plan was adopted, adding more restrictive regulations. This study aims to analyse spatial and temporal variation of intensity and yield of fishing activities on Alentejo rocky shores and evaluate effects of protective measures implemented on these activities. The opinion of Alentejo rocky shores fishermen was evaluated on the existing fishing management laws and their fishing activity was characterized. Roving creel surveys were used for the analysis of fishing intensity. Fishing yield was estimated with direct inquiries and 30’ anglers’ observations. Information on fisheries characterization and fishermen opinion was obtained with direct inquiries. The field work took place between January and July of 2012. Sampling was made in six areas and was stratified by: day type (weekdays, banning period, weekends/holidays); park (areas outside and inside PNSACV park); sea bream closure season (before, during, after) and Easter period (before, during, after). Using previously published data, interannual comparisons between 1995, 1996 and 2012 Easter periods were performed to evaluate effects of protective measures on fishing intensity. The main fishing activities documented on Alentejo rocky shores, during the sampled period were shore angling and shellfish harvesting. Global mean value of intensity of all human activities was 1.32 users.km-1.day-1. Higher global mean values of users were registered during weekends/holidays, especially in areas outside the park. Park areas showed a significant decrease of fishermen.km-1 during banning period. However, during the sea bream closure season, an expected cutback in the number of shore anglers was not observed in the protected area. A high intensity of shellfish harvesting and total predation during Easter period were reported, matching the year’s prior protective measures. Interannual comparisons revealed variation among areas and periods regarding the intensity of all fishing activities. A total yield of fishing activities of about 3 tons of fish and shellfish was recorded, providing an average yield of 0.15 kg.h-1 per fisher. Areas inside the park presented a higher yield regarding total predation when compared with areas outside the park. The yield value of 0.21 kg.h−1 per angler, obtained with the inquiries doubled the yield value of 0.08 kg.h−1 per angler obtained with anglers’ observations. Alentejo rocky shores fishermen are mostly male, employed in manufacturing sectors or pensioners/unemployed/students above 30 years old, residents or with reported birthplace in municipalities with territory enclosed in the natural park and target mainly shellfish and teleost fish. The majority are aware of Portuguese recreational fishing laws and the protective measures implemented in the park. The most common protective measures referred by fishermen that affect their activity are: all measures, sea bream closure season and minimum size/weight of preys. In reverse, fishermen that agree with protective measures listed as more accurate measures closure (all seasons), mandatory fishing licenses and minimum prey sizes. Although recently established protection measures in park areas, might have caused some reduction in fishing intensity, it is still premature to assess the full effects of such measures. Therefore, in order to assess and evaluate accurate effects of protective measures a constantly monitoring of fishing activities should be implemented.
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Bracewell, Philip John. "The effects of electric fishing on some freshwater cyprinid fish species." Thesis, University of Hull, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327287.

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Leaf, Robert Thomas. "The Evolutionary Effects of Fishing: Implications for Stock Management and Rebuilding." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28636.

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Recent empirical studies have demonstrated inter-generational morphological and life-history changes in fish stocks that have been impacted by size-selective harvest. Evolutionary processes in biological populations occur through differential survival and reproductive success based, in part, upon individual phenotypic variability. Fishing is a source of directional selection resulting in the directed removal of some phenotypes; however, many aspects of the evolutionary effects of fishing remain have yet to be described. In order to better understand the life-history and morphological changes that occur as a result of size-selective fishing, and their effect on fishery dynamics, I first determined the suitability of Japanese medaka (Oryzias latipes) for selection experiments. I performed selection experiments using Japanese medaka and report how morphology and life-history characteristics changed over multiple generations of selection. I then used these patterns of change in life-history and morphology to validate individual-based simulation candidate models to test general mechanisms of life-history relationships. Finally, I applied the individual-based simulation modeling approach in order to describe how biological and fishery characteristics change in a large, age-structured population exposed to size-selective fishing over multiple generations. I found that the Japanese medaka has attractive characteristics for biological investigation. The selection experiments indicated large changes in the age-atmaturity, including a nearly 50% decrease over four generations in the most intense sizeselective removal regimes. However, I did not observe significant changes in length-at-age or weight-at-age over the course of the experiment. Candidate simulation models were poor at predicting some aspects of the life-history characteristics of Japanese medaka. The simulation model to determine fishery characteristics predicted large decreases in yield and egg production as a result of decreases in length-at-age. Understanding the relationships of life-history characteristics and their role in determining population resilience is a step toward understanding the importance of evolutionary processes in fishery management.
Ph. D.
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Books on the topic "Effect of fishing on"

1

Ring, Ken. The Maori fishing calendar: Fishing by the moon. Auckland, N.Z: Predict Weather Ltd., 2002.

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Duffield, John W. Effect of proposed changes to rod and reel subsistence harvest regulations in the lower Yukon/Kuskokwim area: Surveys and analysis. Anchorage, Alaska: Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services, 2000.

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Bendock, Terrence N. Mortality and movement behavior of hooked-and-released chinook salmon in the Kenai River recreational fishery, 1989-1991. Anchorage, Alaska: Alaska Dept. of Fish and Game, Division of Sport Fish, 1992.

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Daily, Kin. Exploitation, movement, and mortality associated with capture by electrofishing and angling of largemouth bass in three Oregon coastal lakes. Portland, Or: Fish Division, Oregon Dept. of Fish and Wildlife, 1996.

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1949-, Craik W., Glaister J, and Poiner I, eds. The Effects of fishing. [Melbourne]: CSIRO Australia, 1990.

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Canada. Dept. of Fisheries and Oceans. Gulf Region. Science Branch. Effect of run timing on the exploitation by anglers of atlantic salmon in the Miramichi River. Moncton, N.B: Dept. of Fisheries and Oceans, Science Branch, Gulf Region, 1991.

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Evert, Traugott, ed. Addressing illegal, unreported, and unregulated fishing. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Roach, Stafford M. Injury, survival, and growth of northern pike captured by electrofishing. Anchorage, Alaska: Alaska Dept. of Fish and Game, Division of Sport Fish, 1992.

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Canada. Health and Welfare Canada. Having your catch and eating it too: A few words about sport fish and your health. [Ottawa: Health Canada, 1992.

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Southeast Fisheries Center (U.S.), ed. Preliminary information on turtle captures incidental to fishing in southeastern U.S. waters. Miami, FL: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Fisheries Science Center, 1991.

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Book chapters on the topic "Effect of fishing on"

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Smith, Margaret M., and Phillip C. Heemstra. "The effect of fishing." In Smiths’ Sea Fishes, 19. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82858-4_4.

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Adeleke, Lydia, Jacob Victor Jerry, Desalegn Ayal, Akinola Joshua Oluwatobi, Ayodele Idowu Sunday, and Ajibefun Igbekele Amos. "Climate Variability on Fishing Activities in Inland Waters: Case of Owena River in Ondo and Osun States, Nigeria." In African Handbook of Climate Change Adaptation, 1919–36. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_91.

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AbstractThis chapter examined the effects of climate variability on fishing activities in inland waters: the case of Owena River in Ondo and Osun States, Nigeria. The particular inland water body (Owena) was selected purposively because the Owena River crosses across the two States (Ondo and Osun States). A total of 100 respondents/fisher folks were selected randomly. Primary data was used to get information from the respondents with the aid of the structured questionnaire. Secondary data was used to get information on the climate variability existing in the locations in order to achieve the set objectives. Specifically, the effects of climatic variables such as temperature, rainfall, and wind were determined on fisher folk, fishing duration, fish catch, fishing techniques, and fishing equipment/gears. Descriptive survey design was used to examine the demographic characteristics of respondents. The result revealed that most of the respondents (96%) were male. This chapter established that climate variability particularly strong wind, rainfall, and temperature has adverse effects on fishing activities such as reduction in fish catch, long duration of fishing, loss of fishing gear, change in fishing techniques, and effect on health; hence, the livelihoods of the residence are adversely affected on the long run. In addition to the adverse effect of poverty and loss of life for the fisher folks. Although, the fisher folks livelihoods depend mainly on fisheries resources and optimum fishing depends on favorable climate/weather conditions. Therefore, proper preventive coping strategies against the adverse effect of climate variables should be paramount in both States (Ondo and Ekiti) to improve livelihoods and food security.
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Lydia, Adeleke Mosunmola, Jacob Victor Jerry, Desalegn Yayeh Ayal, Akinola Joshua Oluwatobi, Ayodele Idowu Sunday, and Ajibefun Igbekele Amos. "Climate Variability on Fishing Activities in Inland Waters: Case of Owena River in Ondo and Osun States, Nigeria." In African Handbook of Climate Change Adaptation, 1–18. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-42091-8_91-1.

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AbstractThis chapter examined the effects of climate variability on fishing activities in inland waters: the case of Owena River in Ondo and Osun States, Nigeria. The particular inland water body (Owena) was selected purposively because the Owena River crosses across the two States (Ondo and Osun States). A total of 100 respondents/fisher folks were selected randomly. Primary data was used to get information from the respondents with the aid of the structured questionnaire. Secondary data was used to get information on the climate variability existing in the locations in order to achieve the set objectives. Specifically, the effects of climatic variables such as temperature, rainfall, and wind were determined on fisher folk, fishing duration, fish catch, fishing techniques, and fishing equipment/gears. Descriptive survey design was used to examine the demographic characteristics of respondents. The result revealed that most of the respondents (96%) were male. This chapter established that climate variability particularly strong wind, rainfall, and temperature has adverse effects on fishing activities such as reduction in fish catch, long duration of fishing, loss of fishing gear, change in fishing techniques, and effect on health; hence, the livelihoods of the residence are adversely affected on the long run. In addition to the adverse effect of poverty and loss of life for the fisher folks. Although, the fisher folks livelihoods depend mainly on fisheries resources and optimum fishing depends on favorable climate/weather conditions. Therefore, proper preventive coping strategies against the adverse effect of climate variables should be paramount in both States (Ondo and Ekiti) to improve livelihoods and food security.
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Lima, Ana Teresa Macas, Ida Maria Gieysztor Bertelsen, Lisbeth Mølgaard Ottosen, and Neil A. James. "The Effect of Fishing Nets Aging on Metal Uptake." In Marine Plastics: Innovative Solutions to Tackling Waste, 189–210. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-31058-4_11.

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AbstractFishing nets are mainly constituted of Polyethylene (PE), Polyamide, Polyethylene terephthalate (PET), Polypropylene (PP), and Nylon. While new, these plastics exhibit pristine mechanical performance but lose it as they age. But what about their metal adsorptive performance? Literature finds that plastics like PET and PVC accumulate Al, Cr, Mg, Fe, Co, Ni, Zn, Cd, and Pb, even when exposed to very low concentrations. This is mainly true for aged PVC (Kedzierski et al. Adsorption/desorption of Micropollutants. Mar Pollut Bull. 127:684–694, 2018). In this study, we look at the effect of age on the properties of fishing nets, including their capacity to adsorb metals. Because fishnets are in great part constituted by PE, we used standardized PE pellets as our reference. In calorimeter signaling, we observed that end-of-life fishing nets display a very different differential scanning calorimetry (DSC) pattern; both new and old fishing nets are very different from standardized PE polymer. Preliminary results show that Cr, Cu, Pb, and Se adsorption onto fishing nets occurs in the first 10 min to 6 h of exposure (24 h for Se). The maximum uptake was registered at 11 mg Cr kg‒1, 38 mg Cu kg‒1, 27 mg Pb kg‒1, and 15 mg Se kg‒1. All these concentrations refer to old end-of-life PE fishing nets, where new, unused PE fishing nets adsorb 2–20 times less (Old in this chapter refers to used fishing nets. The term is not attempting to attribute a particular life span/age to the nets). A comparison to different EU directives that regulate metal content in plastics for different end-uses shows that the old end-of-life PE fishing nets, after exposure to heavy metals, do not meet the regulations for hazardous waste. We believe that Greenlandic old waste fishing nets can be used to clean the wastewater, or metal-contaminated water, in Greenland and eventually, the rest of the world.
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Koss, Mikołaj, Martin Stjernstedt, Iwona Pawliczka, Anja Reckendorf, and Ursula Siebert. "Whaling, Seal Hunting and the Effect of Fisheries on Marine Mammals." In Marine Mammals, 33–47. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-06836-2_3.

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AbstractThere are various types of interactions between marine mammals and fisheries, and their presence in the same area inevitably leads to conflicts. Marine mammals may lose their lives as bycatch, which is the incidental catch of non-target species in fishing gear. On the other hand, some marine mammals specialise in feeding on fish caught in fishing gear, resulting in damaged and reduced catch as well as destroyed fishing gear. There are different methods to reduce bycatch and catch damage, such as reducing fishing efforts, using acoustic deterrent devices, employing temporal and zonal closure of fishing areas and using alternative fishing gear. Here we give an overview of whaling and sealing from historical and present perspectives, with examples for Baltic marine mammals. We present hands-on activities to familiarise students and teachers with investigations of prey remains, such as otoliths (fish ear stones) found in faeces, to learn about marine mammal diet. Additionally, we introduce a whaling role play designed as a debate between interest groups, to better understand whaling from different perspectives.
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Kaiser, M. J., and S. Jennings. "Ecosystem Effects of Fishing." In Handbook of Fish Biology and Fisheries, Volume 2, 342–66. Oxford, UK: Blackwell Science Ltd, 2008. http://dx.doi.org/10.1002/9780470693919.ch16.

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Fabinyi, Michael, and Kate Barclay. "Fishing Livelihoods and Wellbeing." In Asia-Pacific Fishing Livelihoods, 91–109. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79591-7_5.

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AbstractThe final chapter of this book discusses the implications of a relational approach to fishing livelihoods for governance for improved social and ecological outcomes. The chapter reviews some of the ways in which academics, activists and policymakers can use approaches that emphasise the relational context of fishing livelihoods, and specifies the concept of wellbeing as one that can usefully and practically build bridges between fisheries stakeholders with diverse interests. The chapter then examines two assessments of fisheries on community wellbeing: the social and economic impacts of fisheries in Australia, and the effects of governance on wellbeing of fishing communities in Indonesia and Solomon Islands.
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Rochet, Marie-Joëlle, and Lise Marty. "Effects of Fishing on the Population." In Fish Reproductive Biology, 188–225. Oxford, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118752739.ch4.

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"Measuring the effect of fishing, 1890–1900." In Scaling Fisheries, 70–109. Cambridge University Press, 1994. http://dx.doi.org/10.1017/cbo9780511470868.008.

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Hilborn, Ray, and Ulrike Hilborn. "Recreational Fishing." In Ocean Recovery, 83–91. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198839767.003.0007.

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Recreational Fishing. Recreational fisheries involve far more people than commercial fisheries do in most of the developed countries, and their economic value is often estimated to be larger than that of commercial fisheries. The main objective of most recreational fisheries is the opportunity to fish rather than the number or value of fish caught, and very different management methods are appropriate. Ideally, the total fishing effort should be maximized rather than reduced, to keep costs down as for commercial fisheries. Access to recreational fishing differs greatly around the world and ranges from effectively privatizing fishing opportunity to allowing anyone wishing to fish to do so.
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Conference papers on the topic "Effect of fishing on"

1

Sampson, Rod, Mehmet Atlar, Bulent Danisman, Omer Goren, Gerry Smart, and John Ironside. "On The Effect of Forebody OptimiSation of Fishing Vessels." In Fishing Vessels, Fishing Technology & Fisheries. RINA, 2005. http://dx.doi.org/10.3940/rina.fis.2005.1.

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Feng, Jianfeng, and Hongli Wang. "Effect of Fishing on the Complex Dynamics of Marine Ecosystems." In 2009 International Workshop on Chaos-Fractals Theories and Applications (IWCFTA). IEEE, 2009. http://dx.doi.org/10.1109/iwcfta.2009.83.

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Shen, Haixue, Terrance Quinn, Vidar Wespestad, Martin Dorn, and Matthew Kookesh. "Using Acoustics to Evaluate the Effect of Fishing on School Characteristics of Walleye Pollock." In Resiliency of Gadid Stocks to Fishing and Climate Change. Alaska Sea Grant College Program, 2008. http://dx.doi.org/10.4027/rgsfcc.2008.07.

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Cardinale, Massimiliano, Joakim Hjelm, and Michele Casini. "Disentangling the Effect of Adult Biomass and Temperature on the Recruitment Dynamics of Fishes." In Resiliency of Gadid Stocks to Fishing and Climate Change. Alaska Sea Grant College Program, 2008. http://dx.doi.org/10.4027/rgsfcc.2008.12.

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Proboseno, N. G., N. B. Sangka, A. Y. Benigno, H. Fadilah, J. Kurniawan, M. Bastian, A. F. Hutama, and D. A. Kesnawaty. "Fishing Job Optimization: Accelerating & Increasing of Successful Fishing Job Through Digitalization PHR Fishing Complexity Calculator." In GOTECH. SPE, 2024. http://dx.doi.org/10.2118/219265-ms.

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Abstract Fishing operations are complex and time-consuming. This is due to the associated uncertainty with the orientation and condition of the tool that requires fishing. Fishing usually is needed when least expected and brings a sudden halt to operations, especially if the downhole tools become stuck. Reaction planning begins at this time unless the project was planned properly from the outset. That reaction planning is not good is not the question. What is important is to establish the facts. What should be done to free the stuck? What will the cost be? This paper addresses these questions. It also emphasizes the importance of routine, continuous, but often unrewarded, effort by operation personnel. An innovative approach to evaluate success ratio for retrieving a fish, not only using risk factors in the decision-making but also economical view is called PHR Fishing Complexity Calculator. Decision-making processes involved in recovering the fish when the downhole tools are stuck. The goal is to provide a usable wellbore at the lowest ultimate cost. Nowadays, the world is working in industrial revolution 4.0, where all are about digital transformation, increase the automation, artificial intelligence, and more simple work process. To keep the existences and explore the optimization in Industrial revolution 4.0, Oil and Gas Industry must be adapted and accelerated day to day operational in line with the advances of technology. Drilling & Well Intervention as an essential part of puzzles in Oil and Gas Industry which responsible not only to maintain the health of the wells but also make a guarantee the longevity of wells performance. The objective of this paper is to show the digitalization and simple workflow using PHR Fishing Complexity Calculator can maximize both quality and delivery time of fishing job "as simple as in your hand". As a result, the success of fishing job can be increased from 39% to 71%. Approximately five wells can be converted into production and fish in holes can be retrieved. The success of those fishing jobs not only increases the satisfaction of fishing job but also increases production up to 153 Bopd and 2.9 mmscfd. Moreover, the Drilling & Well Intervention Manager often is forced by an extended fishing operation to choose between the known costs incurred with abandonment of retrieval attempts and the unknown costs of continuing fishing operations. The successful manager makes the decision that costs the company the least money. Continuing fishing operations beyond some economic limit is a failure, even if the fish is retrieved and that portion of the hole saved, because more money has been spent in the fishing attempt than would have been spent by not fishing. The strategy is to minimize losses.
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Francescutto, Alberto, Antonio Cardo, and Giulio Russo Krauss. "Dynamic Stability and Effect of Water on Deck Small Fishing Vessels." In Small Craft Safety. RINA, 2001. http://dx.doi.org/10.3940/rina.sc.2001.06.

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Nakamura, Kenta, Shota Suzuki, and Shigeru Tabeta. "A Study on the Operation Strategies for Bottom Otter Trawling in Ise Bay." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61142.

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In order to simulate the bottom trawl fishery in Ise Bay, a typical semi-enclosed bay in Japan, a fishery simulator has been developed that consists of a fish behavioral model and a fishing operations model. The fish behavioral models are developed for two major target species, conger eel and mantis shrimp, which consider the fish migration as well as the growth and the population change. The fish behavioral models are combined with a fishing operation model, which predicts the behavior of trawling boats based on economic conditions and resource distribution as well as the fish catch amount by each boat. The model is applied to evaluate the effects of fishery management, and it is investigated that how the control of fishing efforts or number of owned fishing boats affects the profit of the target fishery. The mesh size of the trawling net which maximizes the total catch is estimated considering both conger eel and mantis shrimp. At the target ports, reduction of boats number will increase the profit because the effect of fixed cost change exceeds the impact of fish catch decrease. However, the optimum reduction rate is different in each port and interactive effect should be also considered.
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Torné Reverté, Alfredo, ANTONI ISALGUÉ BUXEDA, and F. XAVIER MARTÍNEZ DE OSÉS. "EFFECTS OF COVID-19 ON MARITIME ACCIDENTS." In Maritime Transport Conference. Universitat Politècnica de Catalunya. Iniciativa Digital Politècnica, 2024. http://dx.doi.org/10.5821/mt.13179.

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A few years ago, we experienced, worldwide, a pandemic caused by the COVID-19 virus, which had various effects, both physically, emotionally and mentally. During the pandemic, various measures were established to reduce the high contagion among people caused by the virus, restricting contact between people and their activity. Fishing was declared an essential activity and, therefore, could fully develop its commercial activity. In this work we propose to analyze the effects that carrying out fishing activities may have had on maritime accidents in a context marked by uncertainty, the decrease in certain activities, and fear, emphasized by an extreme volume of information. and great media coverage. Under pre-pandemic conditions, the majority of serious maritime accidents in Spain were associated with fishing vessels, and we look here to see if there is an effect of the pandemic restrictions on the number and typology of maritime accidents.
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Ivanovic´, Ana, Richard Neilson, Chibisi Chima-Okereke, and Jianfeng Zhu. "Influence of a Roller Clump on the Seabed." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80145.

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The effect of the impact of trawl gears on benthic communities has been of concern during the last couple of decades. Knowledge of the response of benthic habitats to impacts from fishing gear is of great importance to the ecosystem and the management of sustainable fisheries. A European project, DEGREE (DEvelopment of Fishing Gears with Reduced Effects on the Environment), addresses this concern by focusing on quantifying the environmental and ecological impacts of fishing, developing fishing gears with reduced environmental impact, and assessing the socio-economic consequences of these changes. This paper is a preliminary study focusing primarily on the comparison between laboratory and finite element (FE) modelling of the interaction between a gear component, the roller clump of a twin trawl, and the seabed in terms of penetration and disturbance of the sediment. The FE model and experimental rig are described. Initial outputs of penetration depth from the FE calculations show that the model is highly sensitive to the yield stress and that further investigation is required to achieve full parity with laboratory observations on dry sand.
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Mi-ja, Yang, and J. o. Seong-jae. "The effect of city and fishing village elderly's daily stress on their suicidal thoughts." In Bioscience and Medical Research 2015. Science & Engineering Research Support soCiety, 2015. http://dx.doi.org/10.14257/astl.2015.91.21.

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Reports on the topic "Effect of fishing on"

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Mendo, Tania, Sophie Smout, Johanna Ransijn, Ian Durbach, Paddy McCann, Swithun Crowe, Ariadna Carulla Fàbrega, Irene de Prado, and Mark James. Scottish Inshore Fisheries Integrated Data System (SIFIDS): work package 8B final report identifying fishing activities and their associated drivers. Edited by Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23463.

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[Extract from Executive Summary] This Work Package (WP8B) of the SIFIDS project focused on vessels that are 12 m or under in length, use static gear (pots or creels), and primarily target lobsters (Homarus gammarus), crabs (Cancer pagurus and Necora puber), and prawns (Nephrops norvegicus). WP8B had two principal objectives: 1. Identify fishing activity profiles for static gear vessels in the inshore fleet prosecuting lobsters, crabs and nephrops. 2. Incorporate effort, biological data, socio-economic data, environmental data to understand fishing behaviour
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Börjesson, Patrik, Maria Eggertsen, Lachlan Fetterplace, Ann-Britt Florin, Ronny Fredriksson, Susanna Fredriksson, Patrik Kraufvelin, et al. Long-term effects of no-take zones in Swedish waters. Edited by Ulf Bergström, Charlotte Berkström, and Mattias Sköld. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2023. http://dx.doi.org/10.54612/a.10da2mgf51.

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Marine protected areas (MPAs) are increasingly established worldwide to protect and restore degraded ecosystems. However, the level of protection varies among MPAs and has been found to affect the outcome of the closure. In no-take zones (NTZs), no fishing or extraction of marine organisms is allowed. The EU Commission recently committed to protect 30% of European waters by 2030 through the updated Biodiversity Strategy. Importantly, one third of these 30% should be of strict protection. Exactly what is meant by strict protection is not entirely clear, but fishing would likely have to be fully or largely prohibited in these areas. This new target for strictly protected areas highlights the need to evaluate the ecological effects of NTZs, particularly in regions like northern Europe where such evaluations are scarce. The Swedish NTZs made up approximately two thirds of the total areal extent of NTZs in Europe a decade ago. Given that these areas have been closed for at least 10 years and can provide insights into long-term effects of NTZs on fish and ecosystems, they are of broad interest in light of the new 10% strict protection by 2030 commitment by EU member states. In total, eight NTZs in Swedish coastal and offshore waters were evaluated in the current report, with respect to primarily the responses of focal species for the conservation measure, but in some of the areas also ecosystem responses. Five of the NTZs were established in 2009-2011, as part of a government commission, while the other three had been established earlier. The results of the evaluations are presented in a synthesis and also in separate, more detailed chapters for each of the eight NTZs. Overall, the results suggest that NTZs can increase abundances and biomasses of fish and decapod crustaceans, given that the closed areas are strategically placed and of an appropriate size in relation to the life cycle of the focal species. A meta-regression of the effects on focal species of the NTZs showed that CPUE was on average 2.6 times higher after three years of protection, and 3.8 times higher than in the fished reference areas after six years of protection. The proportion of old and large individuals increased in most NTZs, and thereby also the reproductive potential of populations. The increase in abundance of large predatory fish also likely contributed to restoring ecosystem functions, such as top-down control. These effects appeared after a 5-year period and in many cases remained and continued to increase in the longer term (>10 years). In the two areas where cod was the focal species of the NTZs, positive responses were weak, likely as an effect of long-term past, and in the Kattegat still present, recruitment overfishing. In the Baltic Sea, predation by grey seal and cormorant was in some cases so high that it likely counteracted the positive effects of removing fisheries and led to stock declines in the NTZs. In most cases, the introduction of the NTZs has likely decreased the total fishing effort rather than displacing it to adjacent areas. In the Kattegat NTZ, however, the purpose was explicitly to displace an unselective coastal mixed bottom-trawl fishery targeting Norway lobster and flatfish to areas where the bycatches of mature cod were smaller. In two areas that were reopened to fishing after 5 years, the positive effects of the NTZs on fish stocks eroded quickly to pre-closure levels despite that the areas remained closed during the spawning period, highlighting that permanent closures may be necessary to maintain positive effects. We conclude from the Swedish case studies that NTZs may well function as a complement to other fisheries management measures, such as catch, effort and gear regulations. The experiences from the current evaluation show that NTZs can be an important tool for fisheries management especially for local coastal fish populations and areas with mixed fisheries, as well as in cases where there is a need to counteract adverse ecosystem effects of fishing. NTZs are also needed as reference for marine environmental management, and for understanding the effects of fishing on fish populations and other ecosystem components in relation to other pressures. MPAs where the protection of both fish and their habitats is combined may be an important instrument for ecosystembased management, where the recovery of large predatory fish may lead to a restoration of important ecosystem functions and contribute to improving decayed habitats. With the new Biodiversity Strategy, EUs level of ambition for marine conservation increases significantly, with the goal of 30% of coastal and marine waters protected by 2030, and, importantly, one third of these areas being strictly protected. From a conservation perspective, rare, sensitive and/or charismatic species or habitats are often in focus when designating MPAs, and displacement of fisheries is then considered an unwanted side effect. However, if the establishment of strictly protected areas also aims to rebuild fish stocks, these MPAs should be placed in heavily fished areas and designed to protect depleted populations by accounting for their home ranges to generate positive outcomes. Thus, extensive displacement of fisheries is required to reach benefits for depleted populations, and need to be accounted for e.g. by specific regulations outside the strictly protected areas. These new extensive EU goals for MPA establishment pose a challenge for management, but at the same time offer an opportunity to bridge the current gap between conservation and fisheries management.
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Ayers, R., G. P. Course, and G. R. Pasco. Scottish Inshore Fisheries Integrated Data System (SIFIDS): work package (2) final report WP2A: development and pilot deployment of a prototypic autonomous fisheries data harvesting system, and WP2B: investigation into the availability and adaptability of novel technological approaches to data collection. Edited by Mark James and Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23443.

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[Extract from Executive Summary] To enhance sustainability and foster resilience within Scotland’s inshore fishing communities an effective system of collecting and sharing relevant data is required. To support business decisions made by vessel owners as well as informing fisheries managers and those involved in marine planning it will be vital to collect a range of information which will provide a robust understanding of fishing activity, the economic value of the sector and its importance within local communities. The SIFIDS Project was conceived to assist in attaining these goals by working alongside fishers to develop and test technology to automatically collect and collate data on board vessels, thereby reducing the reporting burden on fishers. The project built upon previous research funded through the European Fisheries Fund (EFF) and was designed to deliver a step change in the way that inshore fisheries in Scotland could be managed in cooperation with the industry. The project focussed on inshore fishing vessels around Scotland, where spatio-temporal information on the distribution of vessels and associated fishing effort is data deficient. The whole project was broken down into 12 highly integrated work packages. This is the integrated report for work packages 2A and 2B, entitled’ Development and Pilot Deployment of a Prototypic Autonomous Fisheries Data Harvesting System’ (2A) and ‘Investigation into the Availability and Adaptability of Novel Technological Approaches to Data Collection’ (2B).
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Rijnsdorp, Adriaan, Dick de Haan, Sarah Smith, and Wouter Jan Strietman. Pulse fishing and its effects on the marine ecosystem fisheries : an update of the scientific knowledge. IJmuiden: Wageningen Marine Research, 2016. http://dx.doi.org/10.18174/405708.

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Tidd, Alexander N., Richard A. Ayers, Grant P. Course, and Guy R. Pasco. Scottish Inshore Fisheries Integrated Data System (SIFIDS): work package 6 final report development of a pilot relational data resource for the collation and interpretation of inshore fisheries data. Edited by Mark James and Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23452.

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[Extract from Executive Summary] The competition for space from competing sectors in the coastal waters of Scotland has never been greater and thus there is a growing a need for interactive seascape planning tools that encompass all marine activities. Similarly, the need to gather data to inform decision makers, especially in the fishing industry, has become essential to provide advice on the economic impact on fishing fleets both in terms of alternative conservation measures (e.g. effort limitations, temporal and spatial closures) as well as the overlap with other activities, thereby allowing stakeholders to derive a preferred option. The SIFIDS project was conceived to allow the different relevant data sources to be identified and to allow these data to be collated in one place, rather than as isolated data sets with multiple data owners. The online interactive tool developed as part of the project (Work Package 6) brought together relevant data sets and developed data storage facilities and a user interface to allow various types of user to view and interrogate the data. Some of these data sets were obtained as static layers which could sit as background data e.g. substrate type, UK fishing limits; whilst other data came directly from electronic monitoring systems developed as part of the SIFIDS project. The main non-static data source was Work Package 2, which was collecting data from a sample of volunteer inshore fishing vessels (<12m). This included data on location; time; vessel speed; count, time and position of deployment of strings of creels (or as fleets and pots as they are also known respectively); and a count of how many creels were hauled on these strings. The interactive online tool allowed all the above data to be collated in a specially designed database and displayed in near real time on the web-based application.
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Conrad, Jon, Linda Nøstbakken, Steven Stone, Henrik Franklin, and César Viteri. Fisheries Management in the Galapagos Marine Reserve: A Bioeconomic Perspective. Inter-American Development Bank, May 2006. http://dx.doi.org/10.18235/0008751.

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Despite numerous efforts and a large investment by the Ecuadorian Government and the international community, fishery management in Galapagos remains highly conflictive and essentially ineffective. Levels of mistrust and lack of communication have eroded the governance mechanisms in place to resolve conflicts over competing uses in the Reserve. In an effort to provide new information and analytical content into the policy debate regarding fisheries management in the marine reserve, the authors of this paper developed this research utilizing an economic approach to regulating use of the primary commercial fisheries in Galapagos. In particular, the objective of this study is to determine the optimal harvest, escapement, and fishing effort for the small-scale fishing fleet of the Galapagos Marine Reserve (GMR). In this study, the focus of attention is the two most important fisheries: the sea cucumber (pepino de mar, or "pepino") and the spiny red lobster. The authors base their analysis on a stochastic discrete time bioeconomic model developed by Reed (1979).
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Sommer, Stefan. Potential effects of the exclusion of bottom fishing in the marine protected areas (MPAs) of the western Baltic Sea – third year observations Cruise No. AL570 22.03. – 11.04.2022, Kiel (Germany) – Kiel (Germany) MGF-OSTSEE-2022. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2022. http://dx.doi.org/10.3289/cr_al570.

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The expedition AL570 with the RV Alkor was carried out within the framework of the interdisciplinary DAM MGF-OSTSEE Project “Potential effects of closure for bottom fishing in the marine protected areas (MPAs) of the western Baltic Sea – baseline observations” funded by the Ministry of Education and Research (BMBF). Within MGF-OSTSEE a consortium of scientists from various institutions investigates how benthic ecosystems in Natura 2000 areas within the German exclusive economic zone develop after the exclusion of bottom trawling. Major goals of the project are i. the initial assessment of the environmental state and its variability in- and outside the three Natura 2000 areas Fehmarnbelt, Oder- and Rönnebank under the ongoing pressure of bottom trawling and ii. the general assessment of the effect of bottom trawling on benthic communities and benthic biogeochemical functioning as well as their development after fishery exclusion. The cruise AL570 concludes a series of three previous expeditions EMB238 (2020) and EMB267/268 (2021) and aimed to survey all components of the benthic food web including prokaryotes, protozoans, meiofauna and macrofauna, as well as sediment properties and biogeochemical processes in selected working areas in- and outside of the MPA. The working program comprised 156 station activities of various gears for biological and biogeochemical sampling of sediments. Solute exchange between the sediment and the water column was investigated using Landers and a novel underwater vehicle the Deep-Sea Rover (DSR) Panta Rhei. Investigations in the water column, seafloor observation and deployments of a dredge supplemented the station work. Due to stormy weather in situ solute fluxe measurements were not performed at the Rönnebank. (Alkor-Berichte ; AL570)
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van Oostenbrugge, Hans J. A. E., and Katell G. Hamon. Overview of the Dutch fishing activities in the Hornsea Project Three wind farm area : Trends in effort, landings and landings value for 2011-2015. Wageningen: Wageningen Economic Research, 2017. http://dx.doi.org/10.18174/421103.

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Bartolino, Valerio, Lena Bergström, Mårten Erlandsson, and Birgit Koehler. Potential future climate change effects on Swedish fish and fisheries. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2023. http://dx.doi.org/10.54612/a.69d4ds9ph6.

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Oceans have been warming at an unprecedented rate over the last few decades and climate change is having profound effects on biodiversity and other ecosystem services that oceans provide for human well-being. The motivation for this report is a strong need to understand the consequences of climate change on aquatic ecosystems to develop strategies to minimize the impact on fished species, fisheries and society. The introduction and first chapters of the report are based on a literature review, which summarizes the current state of knowledge about climate change in the Swedish marine and coastal areas, patterns emerging from the main climate scenarios, and potential effects on fish and fisheries. This is followed by an analysis of species environmental limits and tolerances to a warming environment, focusing on selected fish and invertebrate species of commercial relevance. Thermal safety margins show a smaller buffer for species of boreal origin including the northern shrimp, the gadoids and vendace, among others. Analyses of preferred spawning temperatures and depths enable a preliminary overview of the potential sensitivities of species to a warming environment, showing inter alia that species requiring shallow and cold waters for reproduction are likely more sensitive to the effect of warming. The report also includes a specific analysis of how changes in temperature, salinity and oxygen may affect the availability of suitable spawning and nursery habitats in the Baltic Sea. Using information from recently updated maps of potential spawning and recruitment areas in the Baltic Sea, the potential loss of reproductive grounds is evaluated in an ensemble analysis based on multiple climate scenarios. Finally, the report includes a climate risk analysis, which integrates information on the stocks' specific susceptibilities to climate change (hazard), with information on the vulnerabilities of the evaluated systems and their exposure to climate change. The integration is carried out at the level of different fishing segments (fleets) and at the level of the different coastal administrative regions in Sweden. Thus, the risk analysis aims to identify the relative distribution of climate risk among fishing fleets and geographical regions, and explores how this may develop under alternative climate scenarios. The results show that the risk ranks higher for the salmon, vendace and shrimp fisheries, while geographically, the northern Baltic Sea ranks higher in risk compared to other regions. Most importantly, the analyses show that the risk is not equally driven by hazard, vulnerability and exposure for the different fleets and regions, suggesting that no single risk-reducing approach is sufficient and appropriate across all areas and fleets. The report concludes with a gap analysis together with suggestions for next steps to improve the state of knowledge and enable more precise risk analyses in the future, as well as with summary conclusions.
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Aparisi Romero, Frederic. Fishing in medieval Valencia. Edicions de la Universitat de Lleida, 2021. http://dx.doi.org/10.21001/itma.2021.15.07.

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