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نتیجه جستجو - fisheries

تعداد مقالات یافته شده: 52
ردیف عنوان نوع
1 Biometric indices of eleven mangrove fish species from southwest Bangladesh
شاخص های بیومتریک یازده گونه ماهی حرا از جنوب غربی بنگلادش-2021
Biometric indices, i.e. i) length-weight relationships (LWRs), ii) form factor (a3.0), iii) length-frequency distributions (LFDs), and iv) condition factors (relative KR and Fulton’s KF) are considered to be very cru- cial in the assessment of fishery studies as they provide information on fish population growth and coastal habitat well-being. The study of biometric indices of mangrove fish has, however, received little attention. Our research investigates the LFDs, LWRs, a3.0, KR and KF of 395 individuals from nine families (Latidae, Engraulidae, Gobiidae, Mugilidae, Synbranchidae, Schilbeidae, Scatophagidae, Plotosidae, and Terapontidae). The LFDs showed that the lowest total length (TL) was 4.57 cm for Stolephorus tri, and highest TL was 56.20 for Monopterus cuchia. The LWRs showed that the b (allometric coefficient) values ranging from 2.01 (Plotosus canius) to 3.29 (Terapon jarbua), appeared as highly significant (P < 0.001). Moreover, the KR values ranged from 0.80 to 1.36, which indicate a good state of health of the population. Our findings could be useful in updating the FishBase (online database) and tracking mangrove fish spe- cies sustainably.© 2021 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V. This is an open accessarticle under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Length-weight relationship | Growth | Form factor | Condition | FishBase
مقاله انگلیسی
2 Biometric characteristics of Trachinus araneus Cuveir, 1829, Trachinus draco Linnaeus, 1758 and Trachinus radiatus Cuveir, 1829 (Pisces; Trachinidae) from the Egyptian Mediterranean waters
Biometric characteristics of Trachinus araneus Cuveir, 1829, Trachinus draco Linnaeus, 1758 and Trachinus radiatus Cuveir, 1829 (Pisces; Trachinidae) from the Egyptian Mediterranean waters-2021
The biometric characteristics of Trachinus araneus, Trachinus draco and Trachinus radiatus from the Egyptian Mediterranean waters at the West of Alexandria City, were studied. In total, 105, 96 and 55 specimens of these three Fish species were sampled, respectively, by the use of bottom trawls operated in the sectors of El-Dabaa and Sidi Abd El Rahman. The morphological characteristic and related index ratio were determined. The results showed that T. araneus total length varied from 10.9 to 30.0 cm TL with mean length of 19.87 ± 5.43 cm TL and a number of horizontal dots appear to be distributed along the lateral line, T. draco total length was 11.8 to 27.6 cm TL with a mean length of 17.85 ± 4.23 cm TL, and specimens of this Fish species showed yellow vertical oblique lines on the body. On the other hand, T. radiatus is characterized by a total length of 10.6 to 35.0 cm TL with a mean length 18.04 ± 4.87 cm TL, and by circular brown dots spread on the whole body and head. Furthermore, these three Fish species have poisonous spines, one on each operculum, and both spines on the internal border of the dorsal part of each eye orbit. The morphometric regression of each morphometric character showed close agreement between the observed and calculated values.© 2021 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V. This is an open accessarticle under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Biometric | Characteristics | Trachinus araneus | Trachinus draco | Trachinus radiatus | Mediterranean waters | Egypt
مقاله انگلیسی
3 Preliminary lessons from COVID-19 disruptions of small-scale fishery supply chains
دروس مقدماتی مربوط به اختلالات COVID-19 در زنجیره های تامین شیلات در مقیاس کوچک-2021
The ongoing COVID-19 pandemic and associated mitigation measures have disrupted global systems that support the health, food and nutrition security, and livelihoods of billions of people. These disruptions have likewise affected the small-scale fishery (SSF) sector, disrupting SSF supply chains and exposing weaknesses in the global seafood distribution system. To inform future development of adaptive capacity and resilience in the sector, it is important to understand how supply chain actors are responding in the face of a macroeconomic shock. Comparing across seven SSF case studies in four countries, we explore how actors are responding to COVID-19 disruptions, identify constraints to adaptive responses, and describe patterns of disruption and response across cases. In all cases examined, actors shifted focus to local and regional distribution channels and particularly drew on flexibility, organization, and learning to re-purpose pre-existing networks and use technology to their advantage. Key constraints to reaching domestic consumers included domestic restrictions on movement and labor, reduced spending power amongst domestic consumers, and lack of existing distribution channels. In addition, the lack of recogni- tion of SSFs as essential food-producers and inequities in access to technology hampered efforts to continue local seafood supply. We suggest that the initial impacts from COVID-19 highlight the risks in of over-reliance on global trade networks. The SSFs that were able to change strategies most success- fully had local organizations and connections in place that they leveraged in innovative ways. As such, supporting local and domestic networks and flexible organizations within the supply chain may help build resilience in the face of future macroeconomic shocks. Importantly, bolstering financial wellbeing and security within the domestic market both before and during such large-scale disruptions is crucial for supporting ongoing supply chain operations and continued food provision during macroeconomic crises.
Keywords: Small-scale fisheries | COVID-19 | Adaptive capacity | Supply chain | Resilience | Global seafood distribution system
مقاله انگلیسی
4 The use of fishers’ knowledge to assess benthic resource abundance across management regimes in Chilean artisanal fisheries
استفاده از دانش ماهیگیران برای ارزیابی فراوانی منابع بنیادی در رژیم های مدیریت در شیلات صنایع شیلی-2021
Globally, marine fisheries remain largely unassessed, particularly small-scale fisheries in developing countries. Fishers’ knowledge has proven to be valuable to help fill gaps of information in otherwise unassessed fisheries. This study tested the reliability of fishers’ knowledge to estimate the abundance of two benthic resources, locos (Concholepas concholepas) and keyhole limpets (Fissurella spp.), across two management regimes, territorial user rights for fisheries (TURF) and open access areas (OAA), over ~500 km of coastline in central Chile. Fishers’ knowledge (FK) was quantified using systematic interviews and compared to direct assessments (DA). Addi- tionally, resource abundance was compared between the fishing regimes, considering regions with different concentration of TURFs (and consequently different availability of OAAs). The results show that abundances estimated by the two methods were highly consistent for the most valuable resource (the loco) and quite reliable for the keyhole limpet (for 67% of the comparisons). Abundances of both resources were higher in TURFs than in OAAs, a pattern detected by both FK and DA. The results clearly show the potential of this approach to be applied for the Chilean benthic fisheries over large scales. Interestingly, the results also show significantly lower abundance of locos in OAAs than in TURFs at coves immersed in zones with low availability of open access fishing grounds, suggesting the influence of effort displacement after the implementation of TURFs. This ancillary result highlights the need for seascape management plans that consider the potential, unintended ef- fects of TURFs on resources beyond their boundaries. These findings are of both local and global interest, sup- porting the use of FK to inform management in unassessed small-scale fisheries.
keywords: ادراک فیشر | گرفتن هر واحد تلاش | حقوق کاربر ارضی | جابجایی تلاش | ماهیگیری در مقیاس کوچک | خرگوش | Fishers’ perception | Catch per unit of effort | Territorial user rights | Effort displacement | Small-scale fisheries | Shellfish
مقاله انگلیسی
5 Lessons learned for collaborative approaches to management when faced with diverse stakeholder groups in a rebuilding fishery
درس‌های آموخته‌شده برای رویکردهای مشارکتی در مدیریت هنگام مواجهه با گروه‌های ذینفع مختلف در یک شیلات در حال بازسازی-2021
There is increasing demand within fisheries management for the adoption of management approaches that incorporate in-depth stakeholder participation, scientific uncertainty, multiple objectives, and characterizations of risk. One such approach—management strategy evaluation (MSE)—relies on participation with fishery in- terest groups to consolidate knowledge of the fishery system, define goals, and evaluate feasible management options. However, the focus of much of the literature on MSE emphasizes steps in implementation and its practical application, despite the fact that technical aspects of MSE have the potential to alienate participants without MSE experience. Using the Units 1 and 2 Canadian Atlantic redfish fishery as a case study, we here describe lessons learned from the MSE developed for this rebuilding fishery, focusing on four key challenges: identifying participants for MSE processes; clearly defining their roles; educating participants on the purpose, benefits, and scope of MSE; and mediating disagreements to acquire critical cooperation, inputs, and feedback from the different stakeholder groups within the MSE process.
keywords: ماهی قرمز آتلانتیک | مدیریت همکاری | مشارکت ذینفع | مدل سازی مشارکتی | تصمیم گیری | ارزیابی استراتژی مدیریت | Atlantic redfish | Collaborative management | Stakeholder engagement | Participatory modelling | Decision-making | Management strategy evaluation
مقاله انگلیسی
6 Gathering local ecological knowledge to augment scientific and management understanding of a living coastal resource: The case of Oregon’s nearshore groundfish trawl fishery
جمع آوری دانش زیست محیطی محلی برای تقویت درک علمی و مدیریت از یک منبع ساحلی زنده: مورد ماهیگیری ماهی قرمز مایل به قرمز اورگان-2021
Globally, coastal nearshore regions are an intersecting point for human and biological productivity, often serving as hotspots for subsistence, commercial, and recreational fishing activities. Despite this, many nearshore areas remain poorly understood, monitored or managed. This case study examined the nearshore sector of Oregon’s groundfish trawl fishery, which exists in shallow estuarine and continental shelf habitats common along the West Coast of North America; areas that are important for early life history stages of many commercial and recrea- tional fisheries. The West Coast groundfish fishery includes over 90 different species, 40 of which occur within Oregon’s nearshore (here defined as the portion of the shelf extending seaward to a water depth of 200 m). The very shallow portions of the Oregon Coast (the area of the shelf inshore of 55 m) have been subject to limited scientific survey monitoring, and much of the details of the ecology, health, and processes in these habitats remain poorly understood. The utilization of the nearshore region by the commercial groundfish trawl fleet is also minimally documented despite the fact that experiential knowledge (local ecological knowledge [LEK]; trawl logbooks, fish tickets, interviews) exists. This research explored the capacity of capturing LEK sources to inform and enhance understanding of the drivers of effort and the vitality of nearshore fishery resources. Our approach used statistical analysis and mapping of nearshore trawl effort from 1981 to 2017 and gathered semi- structured interviews of intergenerational fishermen to bolster data-poor areas. Insights provided by sampling strategies and historical to current knowledge of access to groundfish assemblages provide informed baselines for future management. Spatial mapping results revealed a decline in trawl effort on the Oregon continental shelf thought time. Logbook and interview data assessment illuminated market and ecological drivers of fishing behavior as well as a unique sector of the groundfish fleet in Oregon: the beach fleet, with unique market and socio-economic challenges. Findings indicate a mixed-methods approach can provide a more thorough assess- ment of long-term interest in Oregon’s nearshore groundfish fishery. Ensuring better understanding of coastal interfacing regions such as Oregon’s nearshore insights potential for better conservation and utilization of marine resources and improved monitoring in resource limited management contexts.
keywords: دانش زیست محیطی محلی | زمین های دریایی ساحل غربی ایالات متحده | اطلاعات وابسته به ماهیگیری | ماهیگیری ساحلی | Local ecological knowledge | US West Coast groundfishes | Fisheries-dependent data | Coastal fisheries
مقاله انگلیسی
7 Capacity assessment of integrated coastal management for Taiwanese local government
ارزیابی ظرفیت مدیریت یکپارچه ساحلی برای دولت محلی تایوان-2021
Most of the members of the Competent Authority are from the professions such as fisheries or urban planning, which has limited capacity for integrated coastal management, and are urgent on getting into capacity development. Therefore, this paper assesses Taiwan’s local government’s integrated coastal management capabilities through the competency assessment framework provided by the United Nations Development Program as for bridging the gap between required capacity and existing capacity. The main findings of the study are: in terms of Institutional arrangements, the scores of "incorporating stakeholders", "budgeting, management and execution", and "making policies and strategies" are lower. For leadership level and knowledge level, each item has a higher score than 3.30, which shows that local government personnel mostly agree with the leaders of integrated coastal management and have certain knowledge; and in terms of accountability, only "whether your organization has the ability to establish a strong vision of a responsible mechanism" has a lower score of 3.03, which shows that local government personnel also agree on the level of accountability. This shows that the current management and maintaining the status quo of the Competent Authority lacks of overall planning for future coastal use. The leaders of the existing coastal management authorities should form a cross-disciplinary team to fully plan for the coast for the future. In terms of training, there should be a coastal management authority to conduct central training in the first place, and subsidies to the local government. Therefore, we are able to gradually implement integrated coastal management. Summary: In order to promote integrated coastal management and promote the sustainable development of coastal areas, our country announced in February 2015 the implementation of the "Coastal Zone Management Act", the Ministry of Interior Affairs is responsible for the development of the overall coastal management plan, and the local government is responsible for the formulation of the secondary protection plan and the protection plan. However, only a small number of local governments in Taiwan currently have marine affairs specialized units, the rest of the county and city coastal management affairs are mostly promoted by the Urban Development Bureau or the Construction Department. Most of the members of the Competent Authority are from the professions such as fisheries or urban planning, which has limited capacity for integrated coastal management, and are urgent on getting into capacity development. Therefore, the following study assesses Taiwan’s local government’s integrated coastal management capabilities through the competency assessment framework provided by the United Nations Development Program as for bridging the gap between required capacity and existing capacity. The main findings of the study are: in terms of Institutional arrangements, the scores of "incorporating stakeholders", "budgeting, management and execution", and "making policies and strategies" are lower. For leadership level and knowledge level, each item has a higher score than 3.30, which shows that local government personnel mostly agree with the leaders of integrated coastal management and have certain knowledge; and in terms of accountability, only "whether your organization has the ability to establish a strong vision of a responsible mechanism" has a lower score of 3.03, which shows that local government personnel also agree on the level of accountability. This shows that the current management and maintaining the status quo of the Competent Authority lacks of overall planning for future coastal use. The leaders of the existing coastal management authorities should form a cross-disciplinary team to fully plan for the coast for the future. In terms of training, there should be a coastal management authority to conduct central training in the first place, and subsidies to the local governmen
مقاله انگلیسی
8 Accounting for price responses in economic evaluation of climate impacts for a fishery
حسابداری برای پاسخ های قیمت در ارزیابی اقتصادی تاثیرات اقلیمی برای ماهیگیری-2021
The present study evaluates the economic impacts of fluctuations in anchovy (Engraulis spp.) catch in Gyeong- Nam (GN) province, South Korea, arising due to warming seawater, accounting for the effects of the re- sponses of the anchovy price. It combines an inter-regional input-output (IRIO) model of two regions (i.e., GN province and all other provinces combined) with a simultaneous equation system (SES) of anchovy supply and demand functions estimated to make projections of the price and quantity of anchovies based on two greenhouse gas (GHG) concentration scenarios (i.e., representative concentration pathway (RCP) 4.5 and 8.5). Results indicate that estimates of the economic impacts for the two regions will be biased if we consider only the quantity (harvest) change when computing the economic impacts without accounting for the effects of the price re- sponses. None of the previous IO-based economic impact analyses of fisheries account for the price effects induced by a quantity shock. This study fills this critical void by considering such effects.
keywords: تغییرات اقلیمی | ماهیگیری | کره جنوبی | پاسخ قیمت | مدل ورودی-خروجی بین منطقه ای | Climate change | Anchovy fishery | South Korea | Price response | Inter-regional input-output model
مقاله انگلیسی
9 Going on and off the map: Lessons from Swedish fisher knowledge about spawning areas in the Baltic Sea
رفتن به داخل و خارج از نقشه: درسی از دانش فیشر سوئد در مورد مناطق تخم ریزی در دریای بالتیک-2021
Scholars frequently promote fishers’ rich understanding of marine environments as a legitimate and unique form of knowledge that must be accounted for in fisheries management. It is, however, challenging to combine fisher knowledge (FK) with the conventional scientific knowledge that fisheries management relies upon. In this paper we investigate the (in)commensurability between FK and scientific objectives and procedures. Towards this aim we performed interviews with a group of fishers who participated in an earlier Swedish study in which FK was used to map locations of fish spawning areas along the Swedish Baltic coast. By interviewing these fishers again we were able to identify and assess aspects of FK that were left implicit in the earlier study. Based on our results we discuss the value of these aspects of FK for understanding marine environments.
keywords: دانش زیست محیطی محلی | روش های کیفی | ماهیگیری در مقیاس کوچک | دانش زیست محیطی سنتی | Local ecological knowledge | Qualitative methods | Small-scale fisheries | Traditional ecological knowledge
مقاله انگلیسی
10 Using multi-criteria analysis the assess impacts of change in ecosystem-based fisheries management: The case of the Icelandic cod
با استفاده از تجزیه و تحلیل چند معیار ارزیابی اثرات تغییر در مدیریت شیلات مبتنی بر اکوسیستم: مورد COD ایسلندی-2020
This paper presents the outcome of one of the case-studies of the EU-funded FP7 research project MareFrame. The project sought to remove the barriers preventing more widespread use of the ecosystem-based approach to fisheries management by developing integrated ecosystem-based assessment methods and a decision support framework for the management of marine resources. The findings are intended to support the implementation of the Common Fisheries Policy (CFP) and Marine Strategy Framework Directive (MSFD). The case study focused on the Icelandic cod fishery which is by far the most important fishery in Iceland, accounting for 43% of the country’s total export values of seafood in 2016. Sound biological and economic management of the fishery is therefore essential for both the nation as a whole as well as individual fisheries-dependent communities. The analysis is done in two main steps. We first use the statistical multi-species model Gadget, developed by the Icelandic Marine and Freshwater Research Institute, to estimate the development of catches by fleet segments (trawl, net and longline) and stock size. Comparisons are made with two scenarios: a) adhering to the present harvest control rule or b) changing the effort to a level corresponding to fishing mortality associated with maximum sustainable yield (FMSY). In the second step, the two outcomes and their socio-economic effects are examined using a three-stage analytic hierarchy process. The case study has been developed in close cooperation with Icelandic stakeholders, and in this paper we describe how the co-creation approach was employed in an ecosystem-based fisheries management framework.
Keywords: Ecosystem-based fisheries management | Co-creation | Gadget | Multi-criteria analysis | Analytic hierarchy process | Cod
مقاله انگلیسی
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