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1
Torkelson, Thomas C., Thomas C. Austin i Peter H. Wiebe. "Multifrequency acoustic assessment of fisheries and plankton resources". Journal of the Acoustical Society of America 103, nr 5 (maj 1998): 3069. http://dx.doi.org/10.1121/1.422854.
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Calicdan, Melanie, Ericson Gumiran, Angel Encarnacion i Jovita Ayson. "Assessment of Fisheries Resources in the Babuyan Channel". Philippine Journal of Fisheries 25, nr 1 (2018): 14–24. http://dx.doi.org/10.31398/tpjf/25.1.2017c0003.
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Prestes, Luiza, Fabiana Calacina da Cunha, Maria Gercilia Mota Soares, Marcos Sidney Brito Oliveira, Netie Izabel Oliveira i Alexandro Cezar Florentino. "Stock Assessment: Sustainable management in high and medium Araguari River, Amapá, Brazil." Ciência e Natura 42 (29.06.2020): e71. http://dx.doi.org/10.5902/2179460x40186.
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Fisheries in Araguari river is an alternative income for families that depend on exploitation of natural resources. This study evaluates fisheries production in high and medium Araguari river to determine the bioeconomic reference points of fishery activities. Logbooks of fisheries were used from Fishermen Colony Z-16 from 2003 to 2010. The Maximum Sustainable Yield (MSY) and Effort at Maximum Sustainable Yield (fmsy) was: MSYSchaefer = 11246 kg and fmsy = 754 fisheries/year, and MSYFox = 11478 kg and fmsy = 1214 fisheries/year and at Bioeconomic Equilibrium (Eebe) Eebe = 10712 kg and Effort at Bioeconomic Equilibrium (febe) febe = 918 fisheries/year. The status of fisheries from Araguari River was declared as overfishing and in this study, we found the same results. The Maximum Economic Yield (MEY) was reached too, as the fisheries were at Bioeconomic Equilibrium (EBE). The fishery mortality (Fyear/Fmsy) and fishery effort (fyear/fmsy) trends show that from 2003 to 2009 the values were sustainable. In 2010 those trends became unsustainable, and the Maximum Economic Yield (MEY) for all years is unsustainable too. It is required this study be considered in future management agreements.
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Sherman, Kenneth. "Sustaining the world's large marine ecosystems". ICES Journal of Marine Science 72, nr 9 (15.09.2015): 2521–31. http://dx.doi.org/10.1093/icesjms/fsv136.
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Abstract In this essay, I review nearly six decades of a career in marine science and fisheries considering scientific contributions, successes, failures, and changes in my field of practice. My body of work has been in plankton research to support fisheries assessments, and in ecosystems programme development and implementation. I describe my early studies on Pacific plankton oceanography in relation to fisheries assessment, and subsequent studies of plankton oceanography and fisheries in relation to coastal ocean fisheries and management. Early in my career, realizing that applications of my published results and those of other fisheries ecologists were generally not included in fish stock assessments, I participated in a national planning group that introduced a system for marine resources monitoring, assessment, and prediction (MARMAP) that included primary productivity, ichthyoplankton, zooplankton, and oceanographic assessments as important components for large-scale fisheries ecology assessment. I joined with European colleagues in ICES to advance fisheries ecology studies in fish stock assessments in the 1970s and 1980s. In 1983, I conceived with Professor Lewis Alexander of the University of Rhode Island a system for assessing and managing marine resources within the spatial domain of ecologically delineated large marine ecosystems (LMEs). On behalf of the National Oceanic and Atmospheric Administration, and in partnership with developing countries, international financial organizations, UN agencies, and NGOs, I am currently contributing scientific and technical advice to a global network of assessment and management projects in 22 LMEs with 110 developing countries and $3.1 billion in financial support. The participating countries are applying a modular framework of natural science and social science indicators for assessing the changing states of LMEs. I conclude the essay with a retrospective viewpoint on my career and changes over half a century of practicing the application of marine science in relation to sustaining the goods and services of the ocean Commons.
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Tanaka, Kengo. "Assessment and Management of Fisheries Resources in Japanʼs EEZ". Marine Engineering 56, nr 2 (1.03.2021): 206–9. http://dx.doi.org/10.5988/jime.56.206.
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Talhelm, Daniel R., Jack A. Donnan, Delano R. Graff, A. P. Grima, Lawrence W. Libby, Scott Milliman i Margaret Ross Dochoda. "Introduction to the Social Assessment of Fisheries Resources Proceedings". Transactions of the American Fisheries Society 116, nr 3 (maj 1987): 289–92. http://dx.doi.org/10.1577/1548-8659(1987)116<289:ittsao>2.0.co;2.
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Sutaman, Sutaman, Yusli Wardiatno, Mennofatria Boer i Fredinan Yulianda. "Assessment of Sustainable Use of Coastal Resources of Regional Waters Conservation Area Biak Numfor Regency, Papua Province, Indonesia". ILMU KELAUTAN: Indonesian Journal of Marine Sciences 22, nr 2 (5.06.2017): 75–84. http://dx.doi.org/10.14710/ik.ijms.22.2.75-84.
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Efforts to exploit fish resources optimally, continuous and sustainable is an urgent demand for the greatest prosperity of the people, especially to improve the welfare of fishermen and fish farmers. The level of sustainable use of coastal resources in water conservation is very important, so that the utilization does not exceed the carrying capacity of the environment. The purpose of this study was to determine the level of sustainable use of coastal resources Biak Numfor, associated with the utilization of fisheries, aquaculture and tourism. The study was conducted in June to December 2015 and October to November 2016. The primary data obtained by interview and direct discussion through Focus Group Disscution (FGD) with fishermen community, tourist and tourist entrepreneurs as well as related officials in the Office of Fisheries and Marine Affairs, and Tourism Office of Biak Numfor Regency. Methods of data analysis approach sustainability analysis conducted by the method of MDS (Multi-Dimensional Scaling) with the help of software Rapfish. Based on the survey results revealed that the value of fisheries ordinated to achieve 57.66%, 44.80% aquaculture, and tourism 46.25%. With these achievements ordinated value, it can be concluded that the use of sustainable capture fisheries are still classified by the lever sustainability attributes include; the type of fishing gear, vessel types used and the catch per unit effort (CPUE). Meanwhile the relatively less sustainable aquaculture with the sustainability lever attributes include; cultivation technology, the number of business units with different types and species of fish. For tourism utilization is still considered less sustainable with levers sustainability attributes include the number of tourists, the type and number of amenities and facilities and infrastructure Keywords: Sustainability, utilization, waters conservation area (KKPD), MDS-Rapfish
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PAPACONSTANTINOU, C., i H. FARRUGIO. "Fisheries in the Mediterranean". Mediterranean Marine Science 1, nr 1 (1.06.2000): 5. http://dx.doi.org/10.12681/mms.2.
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The aim of this paper is to give a description of the Mediterranean fisheries, and its level of exploitation and to address the main questions dealing with its management. The Mediterranean is a semi-enclosed marine area with generally narrow continental shelves. The primary production of the Mediterranean is among the lowest in the world (26-50g C m-2 y-1). The Mediterranean fisheries can be broken down into three main categories: small scale fisheries, trawling and seining fisheries, which operated on demersal, small pelagic and large pelagic resources. After a general description of the state of the resources in the different areas of the Mediterranean it is concluded that (a) the overall pictures from the western to the eastern Mediterranean are not considerably different, (b) the total landings in the Mediterranean have been increased the last decades, and (c) from the perspective of stock assessment, the very few available time series data show stable yield levels. In general fisheries management in the Mediterranean is at a rela- tively early stage of development, judging by the criteria of North Atlantic fisheries. Quota systems are generally not applied, mesh-size regulations usually are set at low levels relative to scientific advice, and effort limitation is not usually applied or, if it is, is not always based on a formal resource assessment. The conservation/management measures applied by the Mediterranean countries can be broadly separated into two major categories: those aiming to keep the fishing effort under control and those aiming to make the exploitation pattern more rational. The most acute problems in the management of the Mediterranean resources are the multispecificity of the catches and the lack of reliable official statistics.
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Yang, Hyun-Joo, Daomin Peng, Honghong Liu, Yongtong Mu i Do-Hoon Kim. "Is China’s Fishing Capacity Management Sufficient? Quantitative Assessment of China’s Efforts toward Fishing Capacity Management and Proposals for Improvement". Journal of Marine Science and Engineering 10, nr 12 (15.12.2022): 1998. http://dx.doi.org/10.3390/jmse10121998.
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As the country with the world’s largest fishing capacity, China suffers from the depletion of living marine resources, mainly caused by overexploitation, the effects of which also distinctly influence global sustainable utilization of marine resources and maritime order. The country has implemented a series of measures to control its national fishing capacity, notably since the late 1980s, and strongly expressed its responsibility and commitment to sustainable resource utilization in the 13th Five-Year Plan (2016–2020). This study quantitatively assesses the effect of China’s fishing capacity management efforts by examining changes in the fishing capacity of marine capture fisheries by region from 1979 to 2019 in Chinese waters, based on window data envelopment analysis (DEA), and further proposes directions for policy adjustment. The results suggest that China’s coastal and offshore fisheries are still subject to overcapacity of approximately 20%, despite major corrective efforts invested in past decades. This implies that China needs to further improve its fishing capacity management and set clear objectives, as determined by the availability of resources and regional features. Global fisheries management’s focus is shifting from input to output control, but overcapacity still threatens the sustainable use of fisheries resources in China and poses obstacles to other systems.
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Torell, Elin, Chikondi Manyungwa-Pasani, Danielle Bilecki, Innocent Gumulira i Gordon Yiwombe. "Assessing and Advancing Gender Equity in Lake Malawi’s Small-Scale Fisheries Sector". Sustainability 13, nr 23 (24.11.2021): 13001. http://dx.doi.org/10.3390/su132313001.
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Women play important, but often invisible, roles in Lake Malawi’s small-scale fisheries sector. This paper augments previous research by exploring the productive and reproductive roles that men and women have in fishing communities and how this shapes women’s access and control over fisheries resources. Contributing to advancing the understanding of how to strengthen women’s roles in the fisheries sector, this paper reports on a qualitative assessment conducted in seven Malawian lakeshore districts. Data collected via focus group discussions, which included gendered resource mapping exercises, revealed belief systems and gender norms that shape men’s and women’s access to and control over lacustrine resources. While both men and women have access to lake and land resources, their roles differ. Men dominate fishing resources whereas women dominate resources that are tied to household management. While all value chain nodes are open to men, women tend to be concentrated in lower-value processing and trading activities. Social norms and values shape people’s access and control over communal resources. It is noteworthy that women who earn an income from the fisheries value chain have more access to savings and credit and have more equal household bargaining power.
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Ha, Vu Viet. "BÀN VỀ ĐIỀU TRA NGHỀ CÁ THƯƠNG PHẨM Ở BIỂN VIỆT NAM". Tạp chí Khoa học và Công nghệ Biển 18, nr 1 (21.06.2018): 52–59. http://dx.doi.org/10.15625/1859-3097/18/1/8663.
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In fish stock assessment, two approaches have been used to collect data: Fisheries independent survey and fisheries survey. Fisheries independent survey provides scientific information on species composition, catch rate, density, distribution, standing stock biomass and biological information of certain species while fisheries survey supplies primary data for a wide variety of statistical analysis of fisheries performance. In Vietnam, fisheries survey was first developed by project “Assessment of the Living Marine Resources in Vietnam” with the support of DANIA since 1998 as the pilot study in 11 coastal provinces with the purpose of establishing the fisheries statistical system in Vietnam. After the pilot stage, it has been extended to all of 28 coastal provinces and worked effectively since 2000. In 2006, when the project ended, the fisheries statistical system collapsed due to no finance support to continue. Since July 2014, the fisheries data collection network has been recovered with the collaboration of Directorate of Fisheries, Research Institute for Marine Fisheries and Provincial Departments of Capture Fisheries and Marine Resources Protection. The survey design was the logbook base with applying the sampling in space and in time method. This is an overview of the capture fisheries survey in Vietnam with its limitations and challenges.
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Yin, Fuzheng, Qun Liu i Xu Chen. "Evaluation of Biological Reference Points of Two Important Fishery Resources in the East China Sea". Journal of Marine Science and Engineering 11, nr 1 (5.01.2023): 121. http://dx.doi.org/10.3390/jmse11010121.
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Fishery resources play an important role in the national economy and ecological diversity in China; it is of great significance to evaluate and rationally exploit the fishery resources. Most fisheries off the coast of China are data-limited, as the complex assessment models are not suitable for its resource assessment. Therefore, data-limited models for fishery resources assessment in China are among the current research hotspots. In this paper, two new data-limited assessment models (Bayesian state–space implementation of the Schaefer production model (BSM) and Monte Carlo MSY estimation model (CMSY)) were used to evaluate the fishery resources of Scomber japonicus and Muraenesox cinereus in the East China Sea. The results showed that the estimated value of MSY of S. japonicus was 220 × 103 t to 240 × 103 t, the estimated value of F/FMSY was greater than one, and the estimated value of B/BMSY was very close to one, indicating that the fishery in the East China Sea had been overfished. The estimated value of MSY for the M. cinereus fishery in the East China Sea ranged from 140 × 103 t to 170 × 103 t. The estimated value of F/FMSY at the biological reference point was greater than one and the estimated value of B/BMSY was less than one, indicating that the fishery had been overfished and resources had declined. Both models can be used for data-limited fisheries offshore of China. To better understand the impact of uncertainty on fishery resource assessment, more research should be carried out on these two data-limited assessment models.
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van der Elst, Rudy, Bernadine Everett, Narriman Jiddawi, Gerald Mwatha, Paula Santana Afonso i David Boulle. "Fish, fishers and fisheries of the Western Indian Ocean: their diversity and status. A preliminary assessment". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, nr 1826 (15.01.2005): 263–84. http://dx.doi.org/10.1098/rsta.2004.1492.
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The Western Indian Ocean represents ca. 8% of the world's oceans but generates only 4% of the global industrial catch. This region is also home to a great proportion of the world's population, living in developing countries with a high dependence on marine resources. Trends in the declared landings of marine resources from the Western Indian Ocean suggest that this ocean may be approaching its maximum harvest potential of ca. 4 Mt per annum, but underreported artisanal catches complicate more–detailed analyses. There is a growing demand for ‘new resources’ to make up for declining stocks, while several large fluctuations are linked to changes in market demand and over exploitation. Artisanal fisheries in the region are highly diversified. Preliminary results are presented of a project that evaluates the conservation status and sustainable management practices in 168 different fishery types. It is concluded that the majority of the region's artisanal fisheries are not adequately supported by scientific information and that management strategies need to be improved if the enormous development challenges of East African countries are to be met.
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Tilzey, R. D. J., i K. R. Rowling. "History of Australia's South East Fishery: a scientist's perspective". Marine and Freshwater Research 52, nr 4 (2001): 361. http://dx.doi.org/10.1071/mf99185.
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The South East Fishery is one of Australia’s oldest fisheries. Early research on this trawl fishery centred on tiger flathead, the major target species. In the 1970s, the Federal Government actively encouraged fishery development and funded several trawl surveys. Profitable catch rates and optimistic assessments of resource size caused a rapid expansion of the trawl fleet. Separate jurisdictions hampered strategic approaches to SEF-wide research until 1978. Most SEF research in the mid 1960s to mid 1980s was conducted by State fisheries agencies, but federal involvement increased thereafter. A management shift in 1992 to Individual Transferable Quotas saw stock assessment become the major research priority. Industry involvement in the stock assessment process has increased markedly over the past decade and communication between scientists, managers and industry has improved. Predictive models are still limited by poor biological data for most quota species. Stock assessment uncertainty necessitates the increasing use of risk assessments and management strategy evaluation. Assessment scientists are frustrated by limited resources for research and the perceived reluctance of managers to adopt more precautionary approaches to uncertainty. Since ITQ management, fishing effort has risen significantly and concerns have been expressed about the stock status of several SEF species. Recent federal environmental legislation is now directing more attention towards effects of fishing and resource sustainability issues.
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García-Lorenzo, Iria, i Manuel María Varela-Lafuente. "Interacciones de gobernanza en las pesquerías a pequeña escala de Galicia: percepciones y dinámicas en las cofradías de pescadores". Studies of Applied Economics 37, nr 3 (9.10.2019): 42. http://dx.doi.org/10.25115/eea.v37i3.2772.
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Small-scale fisheries have specific dynamics in the relationships between resource systems, governance systems and actors. In Galicia, this reality has a central point in the organization of fishermen and shell fishermen in the so-called Cofradías, associative entities with administrative recognition and participation in the fishery resources management. These organisations have a public-private nature, where members share and benefit from the use and exploitation of the marine resources.In this scenario, the paper studies the governance interactions in the small-scale fisheries of Galicia, based on the cofradías perceptions as governance actors. Specifically, the case study analyses the changes in the management of the activities developed by the cofradías, such as production and commercialization, and the influence of the Public Administration and other social entities in the organization. To advance these objectives, the institutional analysis frameworks are applied, specifically the socio-ecological system of E. Ostrom and the governability assessment framework of Jentoft and Chuenpagdee, which allow to study concrete realities without being limited to a specific structure.
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Adediyan, Aderopo Raphael, Uchenna Kingsley Chigozie i Venus Nmakanmma Obadoni. "Foreign Direct Investment and External Debt Impacts Assessment on Environmental Resources Depletion in Nigeria". Ekonomické rozhľady – Economic Review 50, nr 4 (15.12.2021): 361–80. http://dx.doi.org/10.53465/er.2644-7185.2021.4.361-380.
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The public interest in justness, equity and fairness in the use of environmental resources between the present and future generations have raised concern about the current depletion rate of environmental resources in Nigeria. Several socioeconomic factors are involved. Worrisome however is the inflow of foreign direct investment and external debt escalation in recent years in the economy. Importantly, we asked, do they contribute to the depletion of environmental resources in Nigeria? In that, we modelled the implications of growth in FDI and external debt on four cases of environmental resources depletion (forestry, solid minerals, fisheries, and crude oil resources productions). The estimated results suggested that though the depletion rate of environmental resources like crude oil depends largely, over the long run and short run, on the movement in FDI inflow, critical to the level of depletion of the forest is the short run effect of external debt. Furthermore, the depletion level of fisheries responds positively only to a change in FDI with a lag in the short run. In terms of solid minerals, we found a long run impact of external debt. Therefore, provided the impact of a rise in FDI and external debt on the depletion of environmental resources is subject to the particular resource and time in Nigeria, selective policies based on the FDI and external debt management is appropriately adequate to control the level of depletion of environmental resources in Nigeria for the benefit of the future generation.
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Hélias, Arnaud, Juliette Langlois i Pierre Fréon. "Fisheries in life cycle assessment: Operational factors for biotic resources depletion". Fish and Fisheries 19, nr 6 (28.06.2018): 951–63. http://dx.doi.org/10.1111/faf.12299.
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Sugi, La. "Poverty in Golden Fishing: A Regulatory Impact Assessment of Fishermen Poverty in Indonesia". Policy & Governance Review 7, nr 1 (13.01.2023): 54. http://dx.doi.org/10.30589/pgr.v7i1.623.
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An area's wealth of natural resources can bring prosperity to its people. However, this is not the case with the fishermen in the Maluku Tengah Regency, Maluku, Indonesia, who live in the Golden Fishing area. For nearly 20 years, fishermen in this district have lived below the poverty line. In this study, RIA will be used to evaluate policies from the central government level to the district government level. The goal is to add to the repertoire of knowledge in the study of public policy and see the causes of this issue and alternative solutions. This field research uses a qualitative approach with a Regulatory Impact Assessment (RIA) analytical instrument. This study found that the government needed adequate strategies and designs to get fishermen out of the poverty trap. As a result, the government needs help to make quality policies. So that the strategic plan of the Fisheries Service of the Maluku Tengah Regency, which should be the spearhead of fisherman poverty reduction policies, becomes the most dominant inhibiting factor in creating fishermen's welfare. The proof is that many programs in the strategic plan do not favor fishermen. So the Fisheries Service of the Maluku Tengah Regency needs to evaluate the strategic plan as a whole so that it can have a positive impact on fishermen.
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Kaczan, David J., i Pawan G. Patil. "Potential Development Contribution of Fisheries Reform: Evidence From Pakistan". Journal of Environment & Development 29, nr 3 (3.06.2020): 275–305. http://dx.doi.org/10.1177/1070496520925878.
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Mismanagement threatens the productivity and sustainability of an increasing number of capture fisheries globally, hindering these resources’ ability to contribute to socioeconomic and environmental outcomes such as those embodied in the Sustainable Development Goals. Using Pakistan as a case study, we assess the contribution that improved management of Pakistan’s marine fisheries can make to development through economic growth, productivity, employment, and resource sustainability. Using a bioeconomic model based on a recent stock assessment, we find large projected benefits of fisheries reform relative to business as usual. However, projected production volume is not higher than current output, which is inflated by ongoing overfishing. Aquaculture is found to have potential for substantial and complementary socioeconomic benefits. We highlight how Pakistan’s fisheries mirror global trends of plateauing wild capture and falling productivity and suggest key policy changes and investments along the value chain that can underpin more productive and sustainable fisheries in this context.
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Munga, Cosmas Nzaka, Edward Kimani i Ann Vanreusel. "Ecological and socio-economic assessment of Kenyan coastal fisheries: the case of Malindi-Ungwana Bay artisanal fisheries versus semi-industrial bottom trawling". Afrika Focus 26, nr 2 (26.02.2013): 151–64. http://dx.doi.org/10.1163/2031356x-02602010.
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This study explores and describes the status of the fisheries resources in the Malindi-Ungwana Bay, Kenya. In addition to shrimp bottom trawling, the bay also supports a variety of artisanal fishing techniques with associated resource-use conflict experienced for quite some time until a ban on bottom trawling was imposed. This study therefore, focuses on a before and after the trawling ban effect on shrimp populations and finfish bycatch distribution and abundance, and the characterisation of artisanal finfish catches in terms of catch composition, catch-per-unit-effort, and mean trophic level by vessel-gear categories. Apart from providing the current status of exploitation level of the fisheries resources, the scientific information generated from this study is also useful for the revision of the shrimp fishery management plan that was formulated with inadequate scientific and background information during the six year bottom trawling ban in the bay.
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Azis, Abd, Haryuna Syamsuddin, Muhammad Yusfi Yusuf, Siti Syamsuarty, Andi Rismayani i Sainal Sainal. "Assessment of octopus fisheries management based on fishing technique domain by EAFM (ecosystem approach to fisheries management) in Tarupa Island". Tomini Journal of Aquatic Science 3, nr 2 (18.11.2022): 74–84. http://dx.doi.org/10.37905/tjas.v3i2.17015.
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The increase in the utilization of octopus fishery has made it one of the main commodities of the national fisheries sub-sector. One of the areas that make octopus the main commodity for fishing targets is located on Tarupa Island, Selayar Islands Regency. However, with the increasing market demand for octopuses, the pressure on catching octopus will increase so that it is feared that it will disrupt the octopus's own resources. This study aims to evaluate the management status of octopus fisheries on Tarupa Island using the EAFM (Ecosystem Approach to Fisheries Management) approach in the domain of fishing techniques. The assessment of fisheries management in this study uses a method that refers to the NWG EAFM (National Working Group Ecosystem Approach to Fisheries Management) module. In these various methods, the types of data taken are primary data and secondary data. Analysis of the data used an ordinal-based Likert scoring with scoring assessments of 1, 2, and 3. The greater the value, the better the EAFM fisheries management. The results showed that the management of octopus fisheries on Tarupa Island, Selayar Islands Regency based on the EAFM assessment in the fishing technique domain obtained a composite value of 92 with the category of Very Good status. The majority of all indicators get the maximum scoring value, only the fishery crew certification indicator by the regulations obtains the minimum scoring value
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Neis, Barbara, David C. Schneider, Lawrence Felt, Richard L. Haedrich, Johanne Fischer i Jeffrey A. Hutchings. "Fisheries assessment: what can be learned from interviewing resource users?" Canadian Journal of Fisheries and Aquatic Sciences 56, nr 10 (1.10.1999): 1949–63. http://dx.doi.org/10.1139/f99-115.
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Fishers have detailed knowledge of their resources, their environment, and their fishing practices that is rarely systematically collected. We conducted three types of interviews with coastal Newfoundland fishers to identify the range of information available, to see if it could be quantified, and to explore its potential for reconstructing trends within fisheries. These fishers have many terms for Atlantic cod (Gadus morhua), each associated with characteristic patterns of seasonal movement and availability to gear and indicating the location of several coastal spawning areas. They described a variety of changes in fishing practice. Of the four changes that could be quantified, all contributed to decadal-scale increases in catch efficiency prior to 1992, while change in catch per unit of effort for cod was consistently negative at decadal scales. For these fishers' lumpfish (Cyclopterus lumpus) roe fishery, catch per unit of effort was consistently negative in the 1990s. We describe ways to access the large reservoir of information held by fishers, the use of several cross-checks to identify consistent patterns, and the use of trends and patterns to broaden the basis for interpreting quantitative surveys used in fisheries assessment. Local information from resource users can be assembled in forms usable in quantitative stock assessments.
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Hentati-Sundberg, J., J. Hjelm i H. Österblom. "Does fisheries management incentivize non-compliance? Estimated misreporting in the Swedish Baltic Sea pelagic fishery based on commercial fishing effort". ICES Journal of Marine Science 71, nr 7 (23.03.2014): 1846–53. http://dx.doi.org/10.1093/icesjms/fsu036.
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Abstract Fisheries management agencies and fishing industry representatives depend on reliable estimates of fish biomass and mortality for the determination of sustainable catch levels. Lack of data or misreporting may be reasons for unreliable stock assessment, which, in turn, may result in advice that does not reflect the availability of fisheries resources. It has been suggested that the mixed pelagic trawl fisheries in the Baltic represent a case of biased estimates of fish biomass and mortality resulting from misreporting. Here, we estimate the degree of misreporting in the Swedish pelagic fishery (1996–2009) and propose an approach for reconstructing historical catches based on commercial effort data. The analysis suggests that total catches have been underestimated during part of our study period and that systematic misreporting of species composition has taken place over the whole study period. The analysis also suggests that there is overcapacity in the fishery and that such economic incentive could explain the general patterns of misreporting. Applying our method for fisheries with suspected misreporting could significantly improve assessment accuracy, reduce uncertainty and thereby allow for a better link between catches and resource levels.
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King, Jacquelynne R., Gordon A. McFarlane i André E. Punt. "Shifts in fisheries management: adapting to regime shifts". Philosophical Transactions of the Royal Society B: Biological Sciences 370, nr 1659 (5.01.2015): 20130277. http://dx.doi.org/10.1098/rstb.2013.0277.
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For many years, fisheries management was based on optimizing yield and maintaining a target biomass, with little regard given to low-frequency environmental forcing. However, this policy was often unsuccessful. In the last two to three decades, fisheries science and management have undergone a shift towards balancing sustainable yield with conservation, with the goal of including ecosystem considerations in decision-making frameworks. Scientific understanding of low-frequency climate–ocean variability, which is manifested as ecosystem regime shifts and states, has led to attempts to incorporate these shifts and states into fisheries assessment and management. To date, operationalizing these attempts to provide tactical advice has met with limited success. We review efforts to incorporate regime shifts and states into the assessment and management of fisheries resources, propose directions for future investigation and outline a potential framework to include regime shifts and changes in ecosystem states into fisheries management.
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Mir, Shakir Ahmad, Shekhar Nath Ojh, Pachampalayam Shanmugam Ananthan, Neha Wajahat Qureshi, Shivaji Dadabhau Argade, Shahid Gul i Velumani Thangavel. "Livelihood Assessment of Fishers in Dal Lake, Kashmir". Indian Journal of Extension Education 59, nr 3 (2023): 48–53. http://dx.doi.org/10.48165/ijee.2023.59309.
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The study investigates the livelihood conditions, vulnerability, and resilience of the Dal Lake fishers and their readiness and strength to withstand climate shocks and vulnerabilities. The study was conducted in 2019-2020 in three fishing villages of Dal Lake Kashmir, where the livelihood and vulnerability of fisheries-based livelihoods were assessed through a composite index development approach. The fishers of Dal Lake are moderately vulnerable to climate variability and changes. The status of the livelihood capitals of the fishers reveals that most of the capitals are of moderate type, however, the financial capital is poor horizontally among all the fishing villages. It was also found that the socio economic conditions and resilience of the people are in very poor condition. The fisheries related activities and policies are being side-lined because of giving more importance to tourism. The management of the lake is shared between the Fisheries & Tourism departments, and the Jammu and Kashmir Lakes Conservation and Management Authority (power). However, lack of coordination, less availability of resources, less priority to the fisheries sector, and lack of accountability hindered the desired outcomes. Proper management of the lake, coordination between the key stakeholders and fishers is very important and can be achieved through network governance.
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Caddy, J. F. "Current usage of fisheries indicators and reference points, and their potential application to management of fisheries for marine invertebrates". Canadian Journal of Fisheries and Aquatic Sciences 61, nr 8 (1.08.2004): 1307–24. http://dx.doi.org/10.1139/f04-132.
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The use of indicators in management of invertebrate resources is placed in the context provided by more extensive applications in finfish fisheries. Indicators proposed for the Convention on International Trade in Endangered Species based on extent-of-decline and trend analysis are appropriate should full assessments be unavailable. Measuring reproductive performance frequently builds on egg-per-recruit considerations, given that age structure and stock–recruit relationships are rarely available. Reference points derived from models are compared with direct use of data series, and a broad-brush approach providing a redundancy of indicators is recommended. Indicators may measure productivity as well as biomass and exploitation rate, but ecosystem, spatial, habitat, environmental characteristics, and socio economic considerations also require monitoring. There is a need to integrate multiple indicators and limit reference points into harvest rules and other decisional infrastructures. The various driving force – pressure – state – impact – response classifications of indicators in use for environmental assessment are now being proposed for marine resources and offer one context for combining multiple indicators. Another is provided by the traffic light approach already used for invertebrate fisheries. The use of indicators and reference points in stock rebuilding is described.
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Dusaeva, Evgeniya. "Marine spatial planning is a tool for ensuring the sustainable development of the Russian fisheries complex in the context of globalization". Russian Journal of Management 11, nr 2 (5.08.2023): 293–307. http://dx.doi.org/10.29039/2409-6024-2023-11-2-293-307.
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The article presents the results of scientific substantiation of the application of marine spatial planning in the mechanisms of effective management of marine economic activities for the coordinated, consistent use of marine natural resources and sustainable development of the Russian fisheries complex in the context of globalization. Measures for the practical solution of the tasks of the 14 SDGs are also disclosed and an assessment of the current state is given based on the analysis of the volume and structure of extraction of aquatic biological resources and economic indicators of fisheries activities.
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Alvira, Oktariani, Kusratmoko Eko i Kuswantoro. "Assessment of Water Quality in Cilutung Watershed". E3S Web of Conferences 73 (2018): 06004. http://dx.doi.org/10.1051/e3sconf/20187306004.
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Water is very valuable resources that provide people and other living things. Besides the need for water for drinking, water resources play an important role in such as livestock, fisheries, water for irrigation and water recreation. However, water quality of the rivers may degrade due to the variation of land use as human activities increase. Cilutung watershed is dominated by the agricultural land use which in many studies shows that agricultural land use has a great impact on river deterioration. It does not affect only the physicochemical of water, the excessive amount of nutrient may harm the biotic ecosystem. The purpose of this study was assessing water quality of the rivers in Cilutung Watershed and the contributing factors using physicochemical and biological parameters. According to ANOVA and PPM calculations, water quality was affected by land use spatially and river discharge temporally. The overall results showed that the rivers were categorized as slightly polluted referring to WQI, BMWP, and Saprobic Index. In general, all water quality parameters measured in Cilutung watershed met water quality standard Class III as stipulated in Indonesia Government Regulation No. 82/2001. Therefore, water sources were still acceptable for fisheries, animal husbandry, and water for irrigation.
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Kanaiwa, Minoru, Yong Chen i Carl Wilson. "Evaluating a seasonal, sex-specific size-structured stock assessment model for the American lobster, Homarus americanus". Marine and Freshwater Research 59, nr 1 (2008): 41. http://dx.doi.org/10.1071/mf07121.
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Many models of different complexities are developed for fisheries stock assessment, and yet few have been rigorously evaluated for their performance in capturing fisheries population dynamics. This causes confusion about when a model should be used or not in assessing fisheries resources. This is especially true for models with complex structures. The present study evaluated the performance of a seasonal, sex-specific and size-structured stock assessment model with respect to the temporal pattern of recruitment, observation errors associated with input data, process errors and violation of model assumptions for the American lobster Homarus americanus. Using an individual-based lobster simulator, a series of lobster fisheries with different characteristics were simulated and the model was applied to the simulated data to estimate key fisheries parameters. Estimated values were then compared with the true values in the simulated fisheries to evaluate the model’s ability to capture the temporal trend in stock abundance, biomass and recruitment, and to identify factors that might result in model failure. Results show that this newly developed lobster stock assessment model performs well in capturing the dynamics of the lobster population under a wide range of conditions. Temporal trends in natural mortality and biased estimates of growth parameters posed the most serious problems. The present study shows the importance of model evaluation.
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Kuparinen, Anna, Samu Mäntyniemi, Jeffrey A. Hutchings i Sakari Kuikka. "Increasing biological realism of fisheries stock assessment: towards hierarchical Bayesian methods". Environmental Reviews 20, nr 2 (czerwiec 2012): 135–51. http://dx.doi.org/10.1139/a2012-006.
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Excessively high rates of fishing mortality have led to rapid declines of several commercially important fish stocks. To harvest fish stocks sustainably, fisheries management requires accurate information about population dynamics, but the generation of this information, known as fisheries stock assessment, traditionally relies on conservative and rather narrowly data-driven modelling approaches. To improve the information available for fisheries management, there is a demand to increase the biological realism of stock-assessment practices and to better incorporate the available biological knowledge and theory. Here, we explore the development of fisheries stock-assessment models with an aim to increasing their biological realism, and focus particular attention on the possibilities provided by the hierarchical Bayesian modelling framework and ways to develop this approach as a means of efficiently incorporating different sources of information to construct more biologically realistic stock-assessment models. The main message emerging from our review is that to be able to efficiently improve the biological realism of stock-assessment models, fisheries scientists must go beyond the traditional stock-assessment data and explore the resources available in other fields of biological research, such as ecology, life-history theory and evolutionary biology, in addition to utilizing data available from other stocks of the same or comparable species. The hierarchical Bayesian framework provides a way of formally integrating these sources of knowledge into the stock-assessment protocol and to accumulate information from multiple sources and over time.
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Suariningsih, Ketut Tika, I. Wayan Restu i Made Ayu Pratiwi. "PENILAIAN STATUS DOMAIN SUMBER DAYA IKAN LEMURU DENGAN PENDEKATAN EKOSISTEM YANG DIDARATKAN DI PPI KEDONGANAN, BALI". ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) 15, nr 2 (14.12.2021): 236. http://dx.doi.org/10.24843/ejes.2021.v15.i02.p08.
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PPI Kedonganan is a fish landing base located in Kedonganan Village, Kuta District, Badung Regency. One of the fish commodities that landed at PPI Kedonganan is Lemuru Fish (Sardinella lemuru). The high rate of catching Lemuru must be balanced with proper management so that Lemuru Fish Resources remain sustainable. This study was conducted to determine the status of the utilization of Lemuru fish resources. The study was conducted from January 2021 to March 2021. Data collection was carried out by observation and interviews. Data analysis of each indicator was carried out using a multi-criteria analysis approach with composite index assessment and visualization by flag model. Indicators were observed the trends of fish size, the proportion of juvenile fish were caught, the species composition, range collapse of fish resources, Endangered, Threatened, and Protected species. The status assessment of the Lemuru resource domain which landed at PPI Kedonganan is in the good category with a composite value of 66.7. Results of the trend indicators of fish size is relatively fixed, the proportion of fish juvenile caught about 90%, the composition of species caught was 100% of the target fish i.e, lemuru that caught by using gill net, range collapse of fish resources as much as 57% of fishermen expressed relatively fixed in looking for fishing grounds, and ETP species not found.
Keywords: EAFM; Lemuru Fish; Fisheries Management; PPI Kedonganan.
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Hornborg, Sara, i Anton Främberg. "Carp (Cyprinidae) Fisheries in Swedish Lakes: A Combined Environmental Assessment Approach to Evaluate Data-limited Freshwater Fish Resources as Food". Environmental Management 65, nr 2 (19.12.2019): 232–42. http://dx.doi.org/10.1007/s00267-019-01241-z.
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AbstractThe role of aquatic resources to food security is both promising and constrained since the global seafood consumption is increasing while marine fisheries approach the limit of what it can produce. In Sweden, the seafood consumption per capita is higher than the European and world average but the current dietary advice is to increase consumption. Freshwater fisheries have in general been paid less attention in food security discussions. Carp fishes (Cyprinidae) in Sweden have lost their historical value and are currently, both understudied and underutilized. Here we use a combined environmental assessment approach to examine the environmental sustainability of current and potential cyprinid fisheries. We found that current commercial fisheries for Swedish cyprinids in lakes have an average carbon footprint of 0.77 kg CO2e per kg of edible product, substantially smaller than most of the popular marine and terrestrial protein sources consumed in Sweden today. This could be even lower if cyprinid resources were better utilized than currently. The cyprinids however exhibited different vulnerability to fishing pressure and are today associated with data deficiencies. Hence, it is currently uncertain how much food for human consumption they can contribute to. Improved consumer interest and management attention is needed, but to the Swedish diet, cyprinids offer a promising opportunity for future more sustainable and nutritious food systems.
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Hidalgo, Manuel, David M. Kaplan, Lisa A. Kerr, James R. Watson, Claire B. Paris i Howard I. Browman. "Advancing the link between ocean connectivity, ecological function and management challenges". ICES Journal of Marine Science 74, nr 6 (1.07.2017): 1702–7. http://dx.doi.org/10.1093/icesjms/fsx112.
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Abstract “Ocean connectivity” is a dynamic and rapidly evolving field of research in marine science, partly because there is an increasing demand for information on connectivity that informs effective assessment and management of marine resources. Achieving this will require a better alignment between ocean connectivity tools and developments and the needs and challenges of assessments and conservation. For these reasons, the ICES Journal of Marine Science solicited contributions to the article theme set (TS), “Beyond ocean connectivity.” We briefly summarize the nine articles that appear herein, grouping them into four general topics: methodological advances, population dynamics and assessment implications of connectivity, spatial and management implications, and connectivity in ecosystem processes. We also discuss the challenges facing ocean connectivity research if it is to effectively support advancing fisheries assessment frameworks and integrated ecosystem approaches. We hope that the contributions included in this TS serve to convince managers and fisheries scientists of the need to incorporate results from research on connectivity.
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Enomoto, Kazuhiro, Satoshi Ishikawa, Mina Hori, Hort Sitha, Srun Lim Song, Nao Thuok i Hisashi Kurokura. "Data mining and stock assessment of fisheries resources in Tonle Sap Lake, Cambodia". Fisheries Science 77, nr 5 (25.06.2011): 713–22. http://dx.doi.org/10.1007/s12562-011-0378-z.
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Williams, Ashley J., Stephen J. Newman, Corey B. Wakefield, Melanie Bunel, Tuikolongahau Halafihi, Jeremie Kaltavara i Simon J. Nicol. "Evaluating the performance of otolith morphometrics in deriving age compositions and mortality rates for assessment of data-poor tropical fisheries". ICES Journal of Marine Science 72, nr 7 (15.03.2015): 2098–109. http://dx.doi.org/10.1093/icesjms/fsv042.
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Abstract Deepwater snappers (Family Lutjanidae) are important to artisanal and subsistence fisheries in Pacific Island countries. Most species of deepwater snapper are considered vulnerable to exploitation due to their extended longevity and low natural mortality rates. However, the sustainability of deepwater snapper fisheries in Pacific Island countries remains uncertain because there are limited resources available to collect the required data for comprehensive stock assessments. Reliable estimates of the age composition for exploited deepwater snapper populations are limited primarily because of the lack of skills and resources required for routine age estimation from sectioned otoliths. The development of alternative low-cost approaches to derive estimates of age for deepwater snappers is required. We evaluated the performance of using otolith morphometrics (weight, length, width, and thickness) to obtain estimates of age for the most important target species in these fisheries: Etelis carbunculus, E. marshi, E. coruscans, and Pristipomoides filamentosus. We compared age compositions and fishing mortality rates (F) derived from otolith morphometrics with those derived from counts of annual increments in otoliths. We then used the ratio of F to natural mortality (M) as a biological indicator to evaluate the potential effects on management responses by comparing estimates of F/M derived from otolith morphometrics with those derived from annual increment counts. Age compositions and estimates of F and F/M did not differ significantly between those derived from otolith morphometrics and those derived from annual increment counts for all species. These results demonstrate that management responses would likely be similar whether based on age estimates derived from sectioned otoliths, or predicted from otolith morphometrics. In the absence of sufficient resources to section otoliths for age estimation, we recommend that otolith morphometrics be used as a proxy for age in assessments of deepwater snapper fisheries in Pacific Island countries, and potentially for other similar data-limited fisheries.
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Nawawi, Ziaul Haq, Natsir Nessa, Dewi Yanuarita, Muhammad Yusfi Yusuf i Sainal Sainal. "AN ANALYSIS ON SUSTAINABILITY OF SHARK UTILIZATION USING FISH RESOURCES AND FISHING TECHNIQUES APPROACH IN SELAYAR ISLAND REGENCY". Jurnal Ilmu Kelautan SPERMONDE 6, nr 1 (3.05.2020): 26. http://dx.doi.org/10.20956/jiks.v6i1.9901.
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The research aims to record the types of shark utilization in Selayar Islands Regency, explore the spread and shark status of the Regency of Selayar Islands, and examine the sustainability status of shark utilization by fisherman in Selayar Islands. The research method was based on the assessment of EAFM indicator assessments to assess the performance of shark resource management on Tarupa Island, Rajuni Island, Polassi Island and Kayuadi Island Selayar Islands Regency with an indicator approach involving two domains, i.e (1) Fish resources and (2) Fishing technique. The methods of obtaining the data were survey by extracting the data through interviews/questionnaire. The sample was determined using purposive sampling technique. The results of the research indicate that the status of utilizing shark fishery in Selayar Islands Regency is currently in medium category. The main issues indicated are a decrease in catch size and the catch of sharks that are not feasible to catch (50% of catch <Lm). The domains that need to get primary attention in the management of sharks fisheries are the domains of fish resources and fishing technique. The efforts of management carried out in each fields are based on central issues that emerge. Connectivity efforts between communities and institutions are needed to produce functional fisheries management status so that the sustainability of shark resources in Selayar Islands Regency can be sustainable
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Geromont, H. F., i D. S. Butterworth. "Complex assessments or simple management procedures for efficient fisheries management: a comparative study". ICES Journal of Marine Science 72, nr 1 (26.02.2014): 262–74. http://dx.doi.org/10.1093/icesjms/fsu017.
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Abstract Complex stock assessment methods are data- and expertise-hungry, with the annual updates of catch-at-age data and models typically seen as an essential requirement for sound management. But are the heavy commitments of resources required for this level of annual intervention really necessary to achieve efficient long-term fishery management? This question is addressed through a retrospective analysis of management performance over the last 20 years for four North Atlantic fish stocks. The assessments for two of these stocks have exhibited fairly strong retrospective patterns. The actual assessment advice for these stocks was provided based on complex assessment methods making use of age data. The outcomes are compared with what could have been achieved with much simpler catch control rules based upon age-aggregated survey indices alone. Even for the stocks whose assessments exhibit retrospective patterns, these simple rules can achieve virtually equivalent catch and risk performance, with much less interannual TAC variability, compared with what actually occurred over the past 20 years.
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Hvingel, Carsten, Bernard Sainte-Marie i Gordon H. Kruse. "Cold-water shellfish as harvestable resources and important ecosystem players". ICES Journal of Marine Science 78, nr 2 (7.02.2021): 479–90. http://dx.doi.org/10.1093/icesjms/fsab005.
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Abstract The symposium, Shellfish—Resources and Invaders of the North, took place 5–7 November 2019 in Tromsø, Norway. Approximately 110 participants presented and discussed 60 talks and 25 posters. Of these, ten articles are published in this symposium issue. The goal of this symposium was to discuss the role of shellfish, both as harvestable resources and as important ecosystem players in northern hemisphere cold marine environments. To provide perspective for the symposium, the development of four major crustacean fisheries (northern shrimp, snow crab, Homarus, Norway lobster) are reviewed. Our review showed that landings of all these fisheries are still in a state of flux due to inherent population dynamics, fishing, and climate change. The talks and posters covered a broad range of state-of-the-art bioecological knowledge and present challenges in the assessment and management of the most ecologically and/or commercially important cold-water shellfish species belonging to the phyla Arthropoda, Mollusca, and Echinodermata. Various alternative harvesting and management techniques were presented along with perspectives for shellfish aquaculture. Methods and models for stock assessment were thoroughly covered as well as the ecological role of shellfish, their population dynamics, new insights into their biology and genetics, and their changing distribution and significance as invasive species.
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Austin, H. M. "Chesapeake Bay Stock Assessment: Who are they, and Where are they?" Water Science and Technology 26, nr 12 (1.12.1992): 2705–9. http://dx.doi.org/10.2166/wst.1992.0371.
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The Chesapeake Bay, while a significant habitat for fisheries resources, is in actuality an aquatic “bedroom community”, as many of the economically important species are seasonally transient. The pressure on these resources due to their demand for human consumption and recreation, proximity to extensive industrial activity along the shores, and climate scale environmental fluctuations has resulted in stock declines by most important species. Our inability to separate natural population fluctuations from those of anthropogenic origin complicates management efforts. The only way to make these separations, and subsequent informed management decisions is by supporting long-term stock assessment programs (monitoring) in the Bay which allow us to examine trends, cycles and stochastic processes between resource and environment. These programs need to monitor both recruitment and fishing mortality rates of the economically important species, and to identify and monitor the environmentally sensitive “canary” species.
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Bastardie, Francois, J. Rasmus Nielsen, O. R. Eigaard, H. O. Fock, P. Jonsson i V. Bartolino. "Competition for marine space: modelling the Baltic Sea fisheries and effort displacement under spatial restrictions". ICES Journal of Marine Science 72, nr 3 (1.12.2014): 824–40. http://dx.doi.org/10.1093/icesjms/fsu215.
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AbstractMaritime spatial planning (MSP) and fishery management may generate extra costs for fisheries by constraining fishers activity with conservation areas and new utilizations of the sea. More energy-efficient fisheries are also likely to alter existing fishing patterns, which already vary from fishery to fishery and from vessel to vessel. The impact assessment of new spatial plans involving fisheries should be based on quantitative bioeconomic analyses that take into account individual vessel decisions, and trade-offs in cross-sector conflicting interests. We use a vessel-oriented decision-support tool (the DISPLACE model) to combine stochastic variations in spatial fishing activities with harvested resource dynamics in scenario projections. The assessment computes economic and stock status indicators by modelling the activity of Danish, Swedish, and German vessels (>12 m) in the international western Baltic Sea commercial fishery, together with the underlying size-based distribution dynamics of the main fishery resources of sprat, herring, and cod. The outcomes of alternative scenarios for spatial effort displacement are exemplified by evaluating the fishers's abilities to adapt to spatial plans under various constraints. Interlinked spatial, technical, and biological dynamics of vessels and stocks in the scenarios result in stable profits, which compensate for the additional costs from effort displacement and release pressure on the fish stocks. The effort is further redirected away from sensitive benthic habitats, enhancing the ecological positive effects. The energy efficiency of some of the vessels, however, is strongly reduced with the new zonation, and some of the vessels suffer decreased profits. The DISPLACE model serves as a spatially explicit bioeconomic benchmark tool for management strategy evaluations for capturing tactical decision-making in reaction to MSP.
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Pratiwi, Siti Utami, Budy Wiryawan i Domu Simbolon. "Data requirements for operating model of harvest strategy for yellowfin tuna fisheries in North Maluku Waters". IOP Conference Series: Earth and Environmental Science 1033, nr 1 (1.06.2022): 012059. http://dx.doi.org/10.1088/1755-1315/1033/1/012059.
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Abstract This Study focused on tuna handline fisheries in Morotai Island, North Maluku. Yellowfin tuna fisheries have great potential economic value. However, the high level of exploitation by small-scale fisheries in coastal waters is feared to disrupt the sustainability of tuna resources therefore, a better management approach is needed, known as a harvest strategy, based on the use of appropriate data and a strong operating model. Indonesia’s government initiated to development of the harvest strategies to manage tuna resources within Indonesia’s archipelagic waters (FMAs 713, 714, dan 715) as a priority action of the National Tuna Management Plan (NTMP). The implementation of the strategy requires adequate data and completeness of instruments. This research tried to identify the adequacy and availability of harvest strategy data and determine yellowfin resource status with LB-SPR. The case studies demonstrate the utility of scientific monitoring data to track trends in the abundance of adult fish without requiring complex stock assessment models through gap analysis. The adequate data harvest strategy was used to condition prototype operating models for testing preliminary harvest strategies through better OMs and MSE. The results showed that the adequacy of the HS data had a gap of 1.56 with an adjustable rate of 63% or not up to standard. The level of utilization of yellowfin tuna resources using the SPR method leads to overfishing.
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Ba, Kamarel, Modou Thiaw, Massal Fall, Ndiaga Thiam, Beyah Meissa, Didier Jouffre, Omar Thiom Thiaw i Didier Gascuel. "Long-term fishing impact on the Senegalese coastal demersal resources: diagnosing from stock assessment models". Aquatic Living Resources 31 (2018): 8. http://dx.doi.org/10.1051/alr/2017046.
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For the first time in Senegal, assessments based on both stochastic and deterministic production models were used to draw a global diagnosis of the fishing impact on coastal demersal stocks. Based one national fisheries databases and scientific trawl surveys data: (i) trends in landings since 1971 were examined, (ii) abundance indices of 10 stocks were estimated using linear models fitted to surveys data and commercial catch per unit efforts, and (iii) stock assessments were carried out using pseudo-equilibrium Fox and Pella-Tomlinson models and a Biomass dynamic production model fitted in a Bayesian framework to abundance indices. Most stocks have seen their abundance sharply declining over time. All stocks combined, results of stock assessments suggest a 63% reduction compared to virgin state. Three fifth of demersal stocks are overexploited and excess in fishing effort was estimated until 75% for the worst case. We conclude by suggesting that the fishing of such species must be regulated and an ecosystem approach to fisheries management should be implemented in order to monitor the whole ecosystem.
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Christie, W. J., Chris I. Goddard, Stephen J. Nepszy, John J. Collins i Wayne MacCallum. "Problems Associated with Fisheries Assessment Methods in the Great Lakes". Canadian Journal of Fisheries and Aquatic Sciences 44, S2 (19.12.1987): s431—s438. http://dx.doi.org/10.1139/f87-345.
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This paper presents a review of Great Lakes fishery assessment problems and addresses the variety of fisheries, the special circumstances created by rehabilitation, the emergence of joint strategic planning among fishery agencies, and convergence of water quality and fishery management. The inferences that emerge are that (1) continuing observation series are essential, (2) the variety of needs calls for a variety of assessment approaches, and (3) assessment objectives need to be clearly defined in order to protect the ongoing monitoring series. It is suggested that more attention should be given to fish community monitoring, to sport fishery statistics, and to gear calibration. On the other hand, improved coordination of human and material resources and focus on integration of water quality and fisheries assessment can achieve much, without great funding increases.
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Raza, Hasnain, Qun Liu, Mohammed Shahidul Alam i Yanan Han. "Length Based Stock Assessment of Five Fish Species from the Marine Water of Pakistan". Sustainability 14, nr 3 (29.01.2022): 1587. http://dx.doi.org/10.3390/su14031587.
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The marine fisheries resources of Pakistan have been drastically affected in the past few decades. Considering the limitations of previous studies and the data poor condition of the marine fisheries of Pakistan, this study employed the length-based Bayesian biomass (LBB) estimation method for analyzing the fisheries’ representative length-frequency data of five exploited marine fish stocks (Nemipterus japonicus, Nemipterus randalli, Parascolopsis aspinosa, Saurida tumbil, and Lepturacanthus savala). The estimates of relative fishing mortality (F/M) are higher than unity in four stocks except for S. tumbil, indicating overfishing. However, the current values relative to unexploited biomass (B/B0) are below 0.4, which indicates that the stock biomass is deficient in delivering maximum sustainable yield. Overfishing and the mass exclusion of small and older fish from stocks threaten to deplete the biomass of all species. Therefore, this study recommended that increasing the mesh size in commercial fisheries would increase both the catch and biomass of these species. The existing number of boats should be reduced to reduce fishing mortality and bring it back to the ratio of relative fishing mortality (F/M) equal or less than unity, for a sustainable level.
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Soldo, Alen. "An Assessment of Catches of Shore and Boat Recreational Angling along the Coast of the Adriatic Sea". Journal of Marine Science and Engineering 10, nr 12 (15.12.2022): 1999. http://dx.doi.org/10.3390/jmse10121999.
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Recreational fisheries involve millions of people globally, thus there is a growing recognition of the immense economic, sociocultural and ecological importance of recreational fishing as a significant component of global capture fisheries. However, recreational fishing is still not as controlled nor as well investigated as commercial fishing. Although the difference between commercial and recreational fisheries may be obvious, the definition of recreational fishing is not uniform, and the issue becomes more difficult in the case of sport fishing. The clear distinction between sport and recreational fisheries is vague, in particular due to a lack of definition of what constitutes a “recreational” or “sport” fishery. In this study, sport fisheries is considered as the competition-oriented subcategory of recreational fisheries, involving a subset of recreational fishers that participate in fishing competitions. Obtained results from the Adriatic Sea showed differences between shore and boat angling in terms of the species caught and the CPUE, while a comparison of the results from competition and out-of-competition boat angling revealed different tactics and targets of the recreational fishers, which are more efficient than sport fishers. Thus, there is an urgent need for all-inclusive management in the Mediterranean region, particularly because of the social and economic conflicts that may arise and intensify with the decline of the accessible fish resources.
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Lindegren, Martin, Staffan Waldo, P. Anders Nilsson, Henrik Svedäng i Anders Persson. "Towards sustainable fisheries of the Öresund cod (Gadus morhua) through sub-stock-specific assessment and management recommendations". ICES Journal of Marine Science 70, nr 6 (12.05.2013): 1140–50. http://dx.doi.org/10.1093/icesjms/fst042.
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Abstract Lindegren, M., Waldo, S., Nilsson, P. A., Svedäng, H., and Persson, A. 2013. Towards sustainable fisheries of the Öresund cod (Gadus morhua) through sub-stock-specific assessment and management recommendations. – ICES Journal of Marine Science, 70: 1140–1150. Fisheries management traditionally relies on stock assessments assuming discrete populations within large administrational areas. However, failing to account for sub-stock structuring may result in overestimation of the stocks' true harvest potential and unsustainable exploitation of small stock elements. Atlantic cod (Gadus morhua) frequently occurs in spatially segregated populations, some of which exhibit fine-scaled stock structuring within current management boundaries. Here we use the locally spawning cod stock in the Sound (“Öresund”) as a case study, and perform a sub-stock-specific assessment to evaluate biological and economic effects of managing the Sound cod as a separate stock. Our results indicate that reducing exploitation pressure, particularly through technical regulations i.e. increasing gill-net mesh sizes, would not only enhance the stock age distribution, but yield long-term net benefits to the local gill-net fishery. Furthermore, our study emphasizes the need for developing sub-stock-specific management recommendations in order to ensure the maintenance of fisheries resources in general, and the persistence of sub-stock structuring in particular.
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Lindenmayer, David. "Halting natural resource depletion: Engaging with economic and political power". Economic and Labour Relations Review 28, nr 1 (29.12.2016): 41–56. http://dx.doi.org/10.1177/1035304616685265.
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Globally, fisheries and forestry have been characterised by substantial ecological and economic problems. Both sectors have become notorious for depleting the stocks on which they depend, eroding the value of harvested natural resources over time and having significant negative ‘by-catch’ impacts on non-target natural resources. Problems of resource overuse and potential ecosystem collapse inherently derive from poor decisions influenced by those with undue or excessive economic, political and labour market power. Solutions to problems of unsustainability of resource management will need to engage with these economic drivers and beneficiaries, and require strategies including better and more independent assessments of the status and condition of resources. Deep-seated problems caused by resource over-commitment need more robust approaches to resource assessment that (1) better account for uncertainty (including uncertainty resulting from stock losses due to disturbance), (2) avoid ratchet effects and (3) provide appropriate ecological parameters for resource harvest. The United Nations framework for environmental and economic accounting methods can help assess the economic and other contributions of different resource-based industries and inform decisions about trade-offs between competing interests. Finally, there is value in examining successful and unsuccessful industry restructuring, in which decisions to transition away from demonstrably unsustainable resource industries have been made. JEL Codes: Q3
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Douguet, Jean-Marc, Pierre Failler i Gianluca Ferraro. "Sustainability Assessment of the Societal Costs of Fishing Activities in a Deliberative Perspective". Sustainability 14, nr 10 (19.05.2022): 6191. http://dx.doi.org/10.3390/su14106191.
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Assessing the social cost of fisheries is generally seen as a matter of how to monetize the components of fisheries. This paper presents an assessment of the societal cost of fishing activities, seen as a social process that is expected to contribute to the better management of aquatic resources, affecting sustainable development in coastal areas around the world. The originality of this article lies in considering the sustainability assessment from a deliberative perspective. It aims at defining the types of guiding concepts, frameworks, and information sets that might be appropriate for decision support, as we enlarge our scope of concern from fisheries to the ecosystems of eco-regions in the long term. In defining the societal cost of fisheries, through interviews, the objective is, first of all, to identify the social effects (positive and negative) of fishing métiers. By comparing fishing activities in a multi-criteria and multi-actor analysis, this evaluation is intended as a means for the actors to express in different ways (scientific indicators, institutional objectives, etc.) their judgment regarding the sustainability of the fishing profession. This analysis is the basis for defining the methods of monetizing these effects in different eco-regions (West African coastal upwelling and the deltas of Southeast Asia).
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Chrysafi, Anna, i Anna Kuparinen. "Assessing abundance of populations with limited data: Lessons learned from data-poor fisheries stock assessment". Environmental Reviews 24, nr 1 (marzec 2016): 25–38. http://dx.doi.org/10.1139/er-2015-0044.
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Estimation of population abundances in the absence of good observational data are notoriously difficult, yet urgently needed for biodiversity conservation and sustainable use of natural resources. In the field of fisheries research, management regulations have long demanded population abundance estimates even if data available are sparse, leading to the development of a range of fish stock assessment methods designed for data-poor populations. Here, we present methods developed within the context of fisheries research that can be applied to conduct population abundance estimations when facing data-limitations. We begin the review from the less data-demanding approaches and continue with more data-intensive ones. We discuss the advantages and caveats of these approaches, the challenges and management implications associated with data-poor stock assessments, and we propose the implementation of the Bayesian hierarchical framework as the most promising avenue for future development and improvement of the current practices.
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Chodrijah, Umi, i Wiwiet An Pralampita. "KAJIAN SISTEM PERIKANAN MINI PURSE SEINE DI TEMPAT PENDARATAN IKAN TASIK AGUNG, REMBANG, JAWA TENGAH". Jurnal Kebijakan Perikanan Indonesia 2, nr 2 (2.02.2017): 91. http://dx.doi.org/10.15578/jkpi.2.2.2010.91-99.
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Perikanan mini purse seine di Tempat Pendaratan Ikan Tasik Agung, Rembang sangat kompleks, sehingga perlu pendekatan sistem untuk melakukan pengkajian. Perikanan mini purse seine ini melibatkan banyak pelaku atau pihak yang saling berinteraksi. Pihak yang terlibat dalam kegiatan sistem perikanan tersebut adalah nelayan, pedagang, industri pengolahan ikan, konsumen, Dinas Perikanan, Pemerintah daerah, dan Koperasi Unit Desa. Sub model yang digunakan dalam analisis sistem perikanan mini purse seine di Tempat Pendaratan Ikan Tasik Agung, Rembang adalah sub model sumber daya ikan, teknis, usaha penangkapan mini purse seine, harga ikan, mutu dan pemasaran, pendapatan nelayan, dan pendapatan daerah.Mini purse seine fishery in the Tempat Pendaratan Ikan Tasik Agung,Rembang is very complex, so it needs a systems approach to conduct the assessment. Mini purse seine fishery involves many actors or parties interacting. Parties involved in fisheries systems are fishermen, traders, fish processing industry, consumers, Fisheries, Local Government, and KUD. Sub model used in the analysis of the mini purse seine fishery system at Tempat Pendaratan Ikan Tasik Agung, Rembang is a sub model of fish resources, technical, mini purse seine fishing effort, fish prices, quality, and marketing, the income of fishermen, and local revenue.