Contrasting deterministic and probabilistic ranking of catch quotas and spatially and size-regulated fisheries management

2006 ◽  
Vol 63 (8) ◽  
pp. 1777-1792 ◽  
Author(s):  
P Apostolaki ◽  
E A Babcock ◽  
M K McAllister
Keyword(s):  
Fishery Management ◽  
Age Groups ◽  
Probabilistic Modeling ◽  
Eastern Coast ◽  
Sandbar Shark ◽  
Model Based ◽  
Mobile Species ◽  
Management Measures ◽  
The Usa ◽  
Management Advice

Large uncertainties over the dynamics of resource systems have increasingly led to the use of probabilistic modeling in the provision of model-based fishery management advice. However, deterministic analysis still remains the easiest and quickest approach to formulate model-based management advice. Here, we contrast deterministic and probabilistic modeling methods in evaluations of the potential consequences of alternative fishery management measures such as spatial and temporal closures and size-specific regulations. We thereby assess how model-based fishery management advice may vary between deterministic and probabilistic analyses of system dynamics. Using data for the sandbar shark (Carcharhinus plumbeus) population off the eastern coast of the USA, it is shown that under a variety of conditions, the use of management measures that provide protection to specific age groups of a population, such as size limits, might be less effective in achieving stock recovery of slow-growing, late-maturing, highly mobile species than catch quotas. It is also shown that management approaches that, according to deterministic calculations, appear to be the most effective are not so when uncertainty in the population dynamics is taken into account.

Social and economic perspective on recreational billfish fisheries

2003 ◽  
Vol 54 (4) ◽  
pp. 545 ◽  
Author(s):  
Robert B. Ditton ◽  
John R. Stoll
Keyword(s):  
Fishery Management ◽  
Economic Benefits ◽  
Future Research ◽  
Future Research Agenda ◽  
Management Measures ◽  
Trade Offs ◽  
The Social ◽  
The Usa ◽  
Local And Regional Impacts ◽  
Economic Understanding

At the Second International Billfish Symposium in Kona, it was reported that little was known about the social and economic aspects of recreational billfish fisheries. There was plenty of background, some good questions, but few answers. There had been little history of social science involvement in fisheries management at the time and even less in billfish fisheries. Whether authorized or not, fishery management decisions worldwide are going to be made on the basis of ‘best available’ social and economic understanding. Unfortunately, the values held by many in the billfish angler community are not likelyto be well represented in the mix for various reasons. Research in the USA and in Latin America over the past 13 years hasprovided an understanding of the billfish angler constituency, its commitment to catch and release and support for resource conservation, its local and regional impacts on tourism economies, and its willingness-to-pay above andbeyond trip costs (a measure of user value) in the US Atlantic, Puerto Rico, Costa Rica and Mexico Pacific. Although knowledge of the recreational billfish fishery has improved, comparatively little is known about the social and economic benefits associatedwith commercial (direct and bycatch) billfish fisheries. With little more than dockside prices available in many localities, it is difficult to know their value in comparison with recreational fisheries and the possible trade-offs associated with various management measures. In addition to describing what is still not known, this paper will identify a future research agenda in this area.

Age and growth pattern of the thin-lipped mullet Liza Ramada in the Eastern coast of Libya.

2016 ◽  
Vol 5 (06) ◽  
pp. 4620
Author(s):  
Manal M. Khalifa ◽  
Ramadan A. S. Ali ◽  
Abdalla N. Elawad* ◽  
Mohammad El. ElMor
Keyword(s):  
Frequency Distribution ◽  
Age Groups ◽  
Age Determination ◽  
Age And Growth ◽  
Eastern Coast ◽  
Growth Equation ◽  
Length Frequency Distribution ◽  
Length Frequency ◽  
Scale Reading ◽  
Von Bertalanffy Growth Equation

Age and growth characteristics of the thin-lipped Grey Mullet (Liza ramada) were investigated in Eastern coast of Libya. Aging was done by two methods: counting annuli on scales and by length frequency distribution, a total of 218 scales were studied for age determination, in addition of 334 fishes specimen for length frequency distribution reading. Four age groups were determined from scale reading, and five age groups from length frequency distribution methods, the parameters of the Von Bertalanffy growth equation for both sex of all individuals were estimated at 35.4 cm, 0.187 per year, -1.14 years and 2.4, for male were estimated at 35.7 cm, 0.17 per year, -1.367 and 2.3, for female were 38.6 cm, 0.156 per year, -1.383 and 2.4, for L∞, k and t0, and φ′, respectively.

scholarly journals Acute severe ulcerative colitis: management advice for internal medicine and emergency physicians

2021 ◽  
Author(s):  
Konstantina Rosiou ◽  
Christian Philipp Selinger
Keyword(s):  
Ulcerative Colitis ◽  
Rescue Therapy ◽  
Medical Emergency ◽  
Close Monitoring ◽  
Surgical Morbidity ◽  
Severe Ulcerative Colitis ◽  
General Management ◽  
Management Measures ◽  
Management Advice ◽  
Team Setting

AbstractAcute severe ulcerative colitis is a medical emergency that warrants in-patient management. This is best served within a multidisciplinary team setting in specialised centres or with expert consultation. Intravenous corticosteroids remain the cornerstone in the management of ASUC and should be initiated promptly, along with general management measures and close monitoring of patients. Unfortunately, one-third of patients will fail to respond to steroids. Response to intravenous corticosteroid therapy needs to be assessed on the third day and rescue therapies, including cyclosporine and infliximab, should be offered to patients not responding. Choice of rescue therapy depends on experience, drug availability and factors associated with each individual patient, such as comorbidities, previous medications or contra-indications to therapy. Patients who have not responded within 7 days to rescue therapy must be considered for surgery. Surgery is a treatment option in ASUC and should not be delayed in cases of failure of medical therapy, because such delays increase surgical morbidity and mortality. This review summarises the current management of acute severe ulcerative colitis and discusses potential future developments.

scholarly journals Natura 2000 sites and fisheries in German offshore waters

2008 ◽  
Vol 66 (1) ◽  
pp. 155-169 ◽  
Author(s):  
Søren Anker Pedersen ◽  
Heino Fock ◽  
Jochen Krause ◽  
Christian Pusch ◽  
Anne L. Sell ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Fishery Management ◽  
Conservation Status ◽  
Natura 2000 ◽  
Management Measures ◽  
Favourable Conservation Status ◽  
Management Plans ◽  
Natura 2000 Site ◽  
Environmentally Sound ◽  
Fishing Impacts

Abstract Pedersen, S. A., Fock, H., Krause, J., Pusch, C., Sell, A. L., Böttcher, U., Rogers, S. I., Sköld, M., Skov, H., Podolska, M., Piet, G. J., and Rice, J. C. 2009. Natura 2000 sites and fisheries in German offshore waters.–ICES Journal of Marine Science, 66: 155–169. The principal objective of sites selected as part of Natura 2000 is to achieve or maintain a favourable conservation status of habitats and species named in the EU Birds and Habitats directives. In the German exclusive economic zone, the habitat types protected by this legislation are sandbanks and reefs; protected species include marine mammals, seabirds, and specific migratory fish species. The ICES project Environmentally Sound Fishery Management in Protected Areas (EMPAS) aims to answer two questions: (i) To what extent do specific fishing activities significantly threaten attainment of the conservation objectives of the Natura 2000 sites? (ii) What management measures would reduce these conflicts and how effective would they be at helping to ensure the favourable condition of these sites? Assessments of fishing impacts on Natura 2000 sites require basic data on the conservation status of individual habitats and species, as well as data for fine-scale distributions of ongoing fishing activities. This paper describes and discusses the process used by the EMPAS project in developing fishery-management plans for each Natura 2000 site in German offshore waters.

The role of demographic factors of international students on teaching preferences

2016 ◽  
Vol 10 (1) ◽  
pp. 53-71
Author(s):  
Pramila Rao
Keyword(s):  
International Students ◽  
Teaching Methods ◽  
Age Groups ◽  
Demographic Factors ◽  
Demographic Variables ◽  
Eastern Region ◽  
Content Type ◽  
The Usa ◽  
Teaching Preferences ◽  
One Way Anova

Purpose This empirical research was conducted in a medium-sized private university located in the north-eastern region of the USA. The purpose of this paper was to understand whether demographic attributes (age, gender, country of origin and years of stay in the USA) of international students will predict any preferences for specific teaching methods. This study was conducted with international students from October 2012 through May 2013 (fall and spring semesters). Design/methodology/approach This research paper provides hypotheses to explore whether there is any relationship between demographic factors and preferences for various teaching methods. This study analyzes the results using both Pearson’s correlations and one-way ANOVA to reject or accept the hypotheses. Findings The results demonstrated that there were no significant correlations between the demographic variables of international students and teaching methods. However, the one-way ANOVA analyses suggested that there are differences among age groups and their preferences for group projects, years of studying in the USA and their preferences for classroom discussions, and gender and their preferences for textbook assignments. Practical implications This study suggests that scholars provide orientation or training on the host country’s pedagogies so that international students can assimilate better into their academic communities. Originality/value This pioneering paper examines the role between demographic variables of international students and teaching pedagogies. This specific concept has not been examined in this literature before. This understanding could contribute to a richer understanding of this population of students.

scholarly journals Tourist Traffic In The Aconcagua Massif Area

2015 ◽  
Vol 34 (3) ◽  
pp. 65-76 ◽  
Author(s):  
Aneta Marek ◽  
Małgorzata Wieczorek
Keyword(s):  
Statistical Data ◽  
Age Groups ◽  
Spatial Perspective ◽  
The Usa ◽  
Temporal And Spatial

Abstract The aim of the article is an analysis of tourist traffic in the Aconcagua massif, one of the most popular peaks of the Seven Summits. On the basis of statistical data, the tourist traffic was analysed in a temporal and spatial perspective. The applied data made it possible to capture the dynamics of visits in the period 2000/2001 – 2012/2013 and with a breakdown into months, which helped analyse the tourist traffic in this area. In each of the analysed periods, January dominates. Data concerning the origin of tourists according to countries and continents, their age, gender and type of mountaineering activity were also taken into account. Most tourists came from Argentina, the USA and Germany. These are people of age groups 21–30 (33%) and 31–40 (31%). Men account for over 75% of visitors. The favourite mountaineering activity is climbing (about 60%). Aconcagua has invariably been a very popular peak among tourists and climbers. It is a place for training and acclimatisation for alpinists, participating in Himalayan expeditions and climbers collecting peaks of the Seven Summits.

scholarly journals Distribution and density of Lutraria rhynchaena Jonas, 1844 relate to sediment while reproduction shows multiple peaks per year in Cat Ba-Ha Long Bay, Vietnam

2020 ◽  
Vol 15 (1) ◽  
pp. 721-734
Author(s):  
Do Manh Hao ◽  
Do Trung Sy ◽  
Dao Thi Anh Tuyet ◽  
Le Minh Hiep ◽  
Nguyen Tien Dat ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Fishery Management ◽  
Scientific Basis ◽  
Sediment Type ◽  
Medium Sand ◽  
Management Measures ◽  
Sediment Types ◽  
Study Results ◽  
Long Bay ◽  
Benthic Substrate

AbstractLutraria rhynchaena Jonas, 1844 is of great commercial interest, but its reserves have dramatically declined over recent decades. Therefore, there is an urgent need of scientific basis to propose effective fishery management measures and improve artificial aquaculture of the clam. In this study, we investigated the distribution and density of L. rhynchaena, sediment characteristics, and established the clam’s reproductive cycle through monthly observations from August 2017 to July 2018. The study results showed that distribution and density of clams are related to sediment types, and the sediment type of medium sand is likely the best benthic substrate for the clams. The spawning of clams occurred throughout the year with three spawning peaks in January, April and September. For the sustainable management of the clam resource in Cat Ba-Ha Long Bay, the fishery authorities can issue a ban on harvest of the clam in spawning peak months in January, April and September.

scholarly journals What’s the lender liability risk for soil pollution in the People’s Republic of China? An evaluation of China’s new Soil Pollution and Control Law in the light of the USA and UK regimes

2019 ◽  
Vol 21 (3) ◽  
pp. 173-188
Author(s):  
Lloyd Andrew Brown
Keyword(s):  
Soil Pollution ◽  
People’S Republic Of China ◽  
People's Republic Of China ◽  
Republic Of China ◽  
The Usa ◽  
The Law ◽  
Lender Liability ◽  
Management Advice ◽  
And Control ◽  
People's Congress

On 1 January 2019, following a presidential order confirming its adoption by the Fifth Session of the Standing Committee of the 13th National People’s Congress of the People’s Republic of China (PRC), the Law of the People’s Republic of China on Soil Pollution and Control 2019 (SPC) was introduced into law. Succinctly, the SPC was enacted to deal with the vast amount of soil pollution that currently exists in China. This article’s central thesis is that, following a comparative analysis of the regulatory regimes in the USA and UK, the law creates environment-related risks for lenders. In particular, the article is concerned with the risk of lender liability, that is, where the lender itself is made directly liable for the costs of soil pollution remediation. In light of the USA and UK regimes, risk management advice is provided for obviating any prospective lender liability that may be forthcoming from the SPC. As with the regulations in other countries, it appears that the degree of ‘control’ that lenders exercise over their clients must be limited to mitigate the possible transference of any direct liability under the PRC’s principles of property rights law.

From single-species advice to mixed-species management: taking the next step

2004 ◽  
Vol 61 (8) ◽  
pp. 1398-1409 ◽  
Author(s):  
Morten Vinther ◽  
Stuart A. Reeves ◽  
Kenneth R. Patterson
Keyword(s):  
North Sea ◽  
Fishery Management ◽  
Single Species ◽  
Mixed Species ◽  
The North ◽  
Recent Approach ◽  
Starting Point ◽  
The North Sea ◽  
Management Advice ◽  
Management Priorities

Abstract Fishery management advice has traditionally been given on a stock-by-stock basis. Recent problems in implementing this advice, particularly for the demersal fisheries of the North Sea, have highlighted the limitations of the approach. In the long term, it would be desirable to give advice that accounts for mixed-fishery effects, but in the short term there is a need for approaches to resolve the conflicting management advice for different species within the same fishery, and to generate catch or effort advice that accounts for the mixed-species nature of the fishery. This paper documents a recent approach used to address these problems. The approach takes the single-species advice for each species in the fishery as a starting point, then attempts to resolve it into consistent catch or effort advice using fleet-disaggregated catch forecasts in combination with explicitly stated management priorities for each stock. Results are presented for the groundfish fisheries of the North Sea, and these show that the development of such approaches will also require development of the ways in which catch data are collected and compiled.

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