scholarly journals Using Harvest Slot Limits to Promote Stock Recovery and Broaden Age Structure in Marine Recreational Fisheries: A Case Study

2020 ◽  
Vol 40 (6) ◽  
pp. 1451-1471
Author(s):  
Jacob M. Kasper ◽  
Jeffrey Brust ◽  
Amanda Caskenette ◽  
Jason McNamee ◽  
Jason C. Vokoun ◽  
...  
Keyword(s):  
Age Structure ◽  
Recreational Fisheries ◽  
Stock Recovery

Impact of the War in Croatia (1991-1995) on the Differentiation of Age Structure between Serbs and Croats: A Case Study of the Banija Region

2021 ◽  
pp. 1-17
Author(s):  
Aleksandar Kovjanić ◽  
Mila Pavlović ◽  
Vedran Živanović ◽  
Filip Krstić
Keyword(s):  
Age Structure ◽  
Scientific Community ◽  
Total Population ◽  
Population Aging ◽  
Population Decline ◽  
Age Groups ◽  
Economic Conditions ◽  
The Subject ◽  
The Impact

Abstract Aging is the subject of various studies by the scientific community and monitoring by responsible institutions. The intensity of aging and the proportion of age groups among various communities differ due to different socio-economic conditions and characteristics. This article researches the impact of the war in Croatia 1991–1995 and postwar living conditions on the divergence of population aging in the ethnically heterogeneous Banija region. The first postwar census in 2001 recorded a population decline of 44.9% compared to the 1991 census. We analyze the effects of the war on changes in ethnic and age structure, as well as their interrelations. The quantitative and qualitative magnitude of these demographic changes in the inter-census period had a decisive influence on the correlation of age and ethnic structure. The article examines whether the relative share of Serbs or Croats in the total population of a settlement affects the average age of the settlement. The results confirmed that the Serbs are older than the Croats, and are in the phase of the most advanced demographic age. These changes raise the question of the demographic future and the biological viability of the Serbs, who were the majority in the region before the war.

Wastewater treatment by infiltration percolation: a case study

2000 ◽  
Vol 41 (1) ◽  
pp. 77-84 ◽  
Author(s):  
V. Mottier ◽  
F. Brissaud ◽  
P. Nieto ◽  
Z. Alamy
Keyword(s):  
Vadose Zone ◽  
High Water ◽  
Faecal Coliforms ◽  
Dune Sands ◽  
Seaside Resort ◽  
Load Monitoring ◽  
Oxidation Performance ◽  
Kinetics Of ◽  
Stock Recovery

A 1700 p.e. pilot infiltration percolation plant treating the sewage of Mazagon, a seaside resort in the South of Spain, is investigated. Primary effluents, intermittently applied over twin 200 m2 infiltration basins, percolate down to the aquifer through unsaturated dune sands. Each application sequence delivers a volume of 0.25 m3 per m2 of infiltration basin. Analyses of the water sampled at five depths ranging from 0.3 to 2.0 m below the infiltration surface show that the oxidation performance of the plant is highly dependent on the applied load. Monitoring the oxygen content in the air phase of the vadose zone allows to determine the kinetics of the oxygen stock recovery and the oxidation capacity of the plant. Disappointing removal of faecal coliforms and streptococci is attributed to high pore water velocities due to infiltration heterogeneity and the high water height applied during each feeding sequence.

scholarly journals A Study on the Effects of Containment Policies and Vaccination on the Spread of SARS-CoV-2

2020 ◽  
Author(s):  
Vahid S. Bokharaie
Keyword(s):  
Age Structure ◽  
Compartmental Model ◽  
Herd Immunity ◽  
Age Groups ◽  
Age Group ◽  
Model Output ◽  
Monotone Systems ◽  
Different Populations ◽  
Different Levels

AbstractThis paper presents a method to predict the spread of the SARS-CoV-2 in a population with a known age-structure, and then, to quantify the effects of various containment policies, including those policies that affect each age-group differently. The model itself is a compartmental model in which each compartment is divided into a number of age-groups. The parameter of the model are estimated using an optimisation scheme and some known results from the theory of monotone systems such that the model output agrees with some collected data on the spread of SARS-CoV-2.To highlight the strengths of this framework, a few case studies are presented in which different populations are subjected to different containment strategies. They include cases in which the containment policies switch between scenarios with different levels of severity. Then a case study on herd immunity due to vaccination is presented. And then it is shown how we can use this framework to optimality distribute a limited number of vaccine units in a given population to maximise their impact and lower the total number of infectious individuals.MSC subclass92C60, 92C50

Biosocioeconomic analysis of marine recreational fisheries: A comparative case study from the Eastern Mediterranean, Turkey

2016 ◽  
Vol 174 ◽  
pp. 270-279 ◽  
Author(s):  
Sezgin Tunca ◽  
Vahdet Ünal ◽  
Bülent Miran ◽  
Harun Güçlüsoy ◽  
Ana Gordoa
Keyword(s):  
Eastern Mediterranean ◽  
Comparative Case Study ◽  
Recreational Fisheries

Development of a small-scale commercial fish farm in the Ashanti Region of Ghana: a case study of Mr. Poku Gyinaye of Bosomtwi Integrated Aqualife Village.

2020 ◽  
Author(s):  
Nelson Agbo
Keyword(s):  
Management Practices ◽  
Clarias Gariepinus ◽  
Fish Farm ◽  
Small Scale ◽  
Recreational Fisheries ◽  
Commercial Fish ◽  
Ashanti Region ◽  
Public Aquarium ◽  
Predatory Fishes

Abstract This case study documents the development of a small-scale fish farm in an attempt to highlight the efforts of a fish farmer (Mr. Poku Gyinaye, a former Fisheries officer) to establish a commercial fish farm in the Ashanti Region of Ghana. Accounts of the facilities, technology and management practices used by the farmer are described as well as his profile. The objectives of the farmer to undertake such a project were to produce fish seed for fish farmers to help them improve fish production, provide practical aquaculture training for prospective fish farmers and access to recreational fisheries for both local and foreign tourists. At the time of writing (by May 2009), Mr. Gyinaye has almost completed setting up the hatchery and has three large ponds for recreational fishing. He also has plans to start a public aquarium on the site. The main activities on his farm centre on Oreochromis niloticus and Clarias gariepinus fingerling production. He intends to stock his recreational ponds with indigenous predatory fishes.

scholarly journals A study on the effects of containment policies and vaccination on the spread of SARS-CoV-2

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247439
Author(s):  
Vahid S. Bokharaie
Keyword(s):  
Age Structure ◽  
Compartmental Model ◽  
Herd Immunity ◽  
Age Groups ◽  
Age Group ◽  
Model Output ◽  
Monotone Systems ◽  
Different Populations ◽  
Different Levels

This paper presents a method to predict the spread of the SARS-CoV-2 in a population with a known age-structure, and then, to quantify the effects of various containment policies, including those policies that affect each age-group differently. The model itself is a compartmental model in which each compartment is divided into a number of age-groups. The parameters of the model are estimated using an optimisation scheme and some known results from the theory of monotone systems such that the model output agrees with some collected data on the spread of SARS-CoV-2. To highlight the strengths of this framework, a few case studies are presented in which different populations are subjected to different containment strategies. They include cases in which the containment policies switch between scenarios with different levels of severity. Then a case study on herd immunity due to vaccination is presented. And then it is shown how we can use this framework to optimally distribute a limited number of vaccine units in a given population to maximise their impact and reduce the total number of infectious individuals.

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