scholarly journals Fish Diversity of River Siyom of Arunachal Pradesh India: A Case Study

Our Nature ◽  
1970 ◽  
Vol 8 (1) ◽  
pp. 164-169
Author(s):  
K. Bagra ◽  
D.N. Das
Keyword(s):  
Fish Species ◽  
Water Bodies ◽  
Anthropogenic Factors ◽  
Fish Diversity ◽  
Arunachal Pradesh ◽  
Fishery Resources ◽  
The Status ◽  
Social Restriction ◽  
Destructive Fishing

Arunachal Pradesh being rich in fishery resources biophysically, the status of the fish diversity is not known from all the water bodies. A case study was undertaken in the river Siyom (28°11′25′′-28°10′52′′N and 94°45′17′′-97°47′51′′E) of West Siang district, Arunachal Pradesh from 2002 to 2004 with the fragmentary work till 2007. For the purpose, sampling of fish was done from the river time to time using local contraption along with modern nets. A total of 44 species of fishes belongs to 9 families were identified. Fishes of family Cyprinidae were found to be dominant followed by Balitoridae. Some of the fish species were found very rare in the river, which may be due to various anthropogenic factors. Therefore, in addition to social restriction on community fishing some awareness measures need to be taken to prevent the destructive fishing activities in the river.DOI: 10.3126/on.v8i1.4324

scholarly journals Fish Diversity and Its Threatened Status of the Dharla River in Bangladesh

2021 ◽  
Vol 79 (4) ◽  
pp. 163-172
Author(s):  
Md. Ashraful Alam ◽  
Yeasmin Ara ◽  
Imran Parvez ◽  
Jayanto Kumar Roy ◽  
Macksood Alam Khan
Keyword(s):  
Fish Species ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Indigenous Species ◽  
Local Data ◽  
Exotic Fish ◽  
Fish Biodiversity ◽  
Fishing Gears ◽  
Threatened Status ◽  
Destructive Fishing

Abstract Fish diversity of a riverine ecosystem became reduced due to different manmade and natural calamities. This study investigated the present fish biodiversity status of the Dharla River located (25.8103° N, 89.6487° E) in the northern part of Bangladesh from January to December 2018. In this study, the existing fish biodiversity status of the Dharla River was estimated in terms of diversity indices and threatened status (both global and local). Data was collected from the three sampling sites of the river using different fishing gears and three selected fish markets located in the Kurigram district of Bangladesh. A total of 76 fish species were identified belonging to 8 orders, 26 families and 57 genera. The Cyprinidae was the most dominant family represented by 14 species followed by the Danionidae (13 species), Bagridae (8 species) and few minor families. Apart from the indigenous species, nine exotic fish species were also recorded. The Shannon-Weaver diversity (H), Pielous evenness (e) and Margalef richness (D) indices ranged from 3.00 to 3.71, 0.62 to 0.94 and 3.94 to 7.95, respectively. Out of 76 indigenous species, 28 species (37%) were identified as threatened in Bangladesh, which included critically endangered (4), vulnerable (9) and endangered (15) species. Indiscriminate fishing through poisoning and destructive fishing gears were identified as the major threats to fish biodiversity of the Dharla River. Thus, the river serves as considerable support for threatened indigenous fishes. Therefore, necessary steps are needed to stop destructive fishing, establish permanent fish sanctuaries and proper monitoring for maintaining sustainable biodiversity in the Dharla River.

Natural and Anthropogenic Impacts on Forest Structure: A Case Study of Uttarakhand State

2018 ◽  
Vol 11 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Jaspal S. Chauhan ◽  
Alok S. Gautam ◽  
R.S. Negi
Keyword(s):  
Anthropogenic Impacts ◽  
Anthropogenic Activities ◽  
Geographic Area ◽  
Anthropogenic Factors ◽  
Fuel Wood ◽  
Goods And Services ◽  
State Economy ◽  
The Status ◽  
Community People

Forests are among the most important natural resources in Uttarakhand as they occupy 71% of the geographic area and contribute a good share in state economy. They are rich repositories of biodiversity and are providers of ecosystem goods and services to both regional and global community. People are dependent on forests for fuel wood, grass and other biomass. But unfortunately recent trend of data shows a huge degradation of forestland due to natural and anthropogenic activities. Variations in climatic condition and natural disasters are triggering rate of degradation of forests in Uttarakhand. The present paper reviews the status of forest in Uttarakhand and discusses the major natural and anthropogenic factors responsible for its degradation.

scholarly journals The fish diversity of mangrove waters in Lombok Island, West Nusa Tenggara, Indonesia

2018 ◽  
Vol 19 (1) ◽  
pp. 71-76 ◽  
Author(s):  
GEMA WAHYUDEWANTORO
Keyword(s):  
Fish Species ◽  
Diversity Index ◽  
Fish Diversity ◽  
Oryzias Javanicus ◽  
Gill Net ◽  
The Pacific ◽  
Evenness Index ◽  
Richness Index ◽  
Lombok Island

Wahyudewantoro G. 2018. The fish diversity of mangrove waters in Lombok Island, West Nusa Tenggara, Indonesia. Biodiversitas 19: 71-76. Lombok Island’s waters are the main gateway of the mass water flow from the Pacific and Indian Oceans. Therefore, it is suspected the fish species that inhabit them is very diverse. The aim of the research was to reveal the diversity of mangrove fish species, with a case study in West Lombok and Central Lombok. Fishes were caught using cast net with mesh sizes of 1.5 cm and 2.5 cm, gill net with mesh sizes of ¾ inch, 1.5 inch and 2 inches. This research found 38 species belonging to 28 genera and 20 families. Oryzias javanicus and Periopthalmus argentilineatus were distributed at all research stations.Species diversity index (H) of fish was in the range of 2.618 to 3.072, evenness index (E) 0.803 to 0.950 and species richness index (d) from 4.328 to 6.206. Based on the similarity of fish species that exist in each station, the species of fish in station IV were different from those of other stations.

scholarly journals CATCHABILITY AND DIVERSITY OF FISH SPECIES CAPTURED BY GILL NET IN NEW CALABAR RIVER, NIGERIA

2020 ◽  
Vol 26 (2) ◽  
pp. 107
Author(s):  
Olaniyi Olopade ◽  
Henry Eyina Dienye ◽  
Ogheneforon Oderhohwo ◽  
Nathanael Akinsafe Bamidele
Keyword(s):  
Fish Species ◽  
Wiener Index ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Catch Per Unit Effort ◽  
Fish Family ◽  
Gill Nets ◽  
Gill Net ◽  
The Status ◽  
Sarotherodon Melanotheron

The aim of this study was to analyze fish species caught by gill nets and fish diversity of the New Calabar River. Three sampling stations were set based on the coverage situation of the river and ichthyofauna associated with gill nets were sampled twice monthly from February to July 2018. A total of 3,251 fish specimens, representing 11 orders, 15 families, and 28 species, were captured. The order Perciformes was identified as the most abundant representing five families while the remaining had one family each. The fish family Cichlidae was the most represented with seven species, and other notable families were Alestidae, Clupeidae, and Mugilidae, representing three species each. Prominent among the fish caught monthly included Liza falcipinnis, Mugil cephalus, Sarotherodon melanotheron, Sarotherodon galilaeus, Coptodon guineensis, and Sardinella maderensis. The mean catch per unit effort (CpUE) ranged from 3.15±0.2 to 4.85±0.2 kg unit-1 day11. Results of diversity indices revealed that Shannon-Wiener index values varied between 2.64 and 2.82, Simpson diversity ranged from 0.07 to 0.10, and Pielou’s evenness index values ranged from 0.85 to 0.95. The values obtained in this study showed that the status of fish diversity in New Calabar River was stable.

scholarly journals Comparing fish prey diversity for a critically endangered aquatic mammal in a reserve and the wild using eDNA metabarcoding

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Chanjuan Qu ◽  
Kathryn A. Stewart ◽  
Rute Clemente-Carvalho ◽  
Jinsong Zheng ◽  
Yuxiang Wang ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Yangtze River ◽  
Poyang Lake ◽  
Yangtze River Basin ◽  
Water Bodies ◽  
Critically Endangered ◽  
Fish Diversity ◽  
The Yangtze River ◽  
The Yangtze River Basin

Abstract Using environmental DNA (eDNA) metabarcoding, we compared fish diversity in two distinct water bodies within the Yangtze River Basin with known populations of the critically endangered Yangtze finless porpoise (Neophocaena asiaeorientalis; YFP): the Tian-e-Zhou Reserve and Poyang Lake. We aimed to create a fish surveying tool for use in the Yangtze River Basin, while also gaining a better understanding of the prey distribution and diversity within two of the remaining strongholds of YFP. 16S rRNA universal primers were developed to amplify fish eDNA. After high-throughput sequencing and stringent data filtering, we identified a total of 75 fish species (6 orders, 9 families, 57 genera) across seasons and regions. Nine of the 75 fish species were among the 28 known YFP prey species, three of which were detected in all water samples. Our eDNA metabarcoding identified many species that had been previously captured using traditional netting practices, but also numerous species not previously collected in these water bodies. Fish diversity was higher in Poyang Lake than in Tian-e-Zhou Reserve, as well as higher in the spring than in summer. These methods provide a broadly applicable tool to quantify fish diversity and distributions throughout the Yangtze River Basin, and to inform conservation strategies of YFP.

Varied Responses to Human-Induced Seismicity in the City of Azle, Texas

2019 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Sarmistha R. Majumdar
Keyword(s):  
State Government ◽  
Induced Seismicity ◽  
Oil And Gas ◽  
The United States ◽  
The State ◽  
Prior History ◽  
Small Community ◽  
Regulatory Policies ◽  
The Status

Fracking has helped to usher in an era of energy abundance in the United States. This advanced drilling procedure has helped the nation to attain the status of the largest producer of crude oil and natural gas in the world, but some of its negative externalities, such as human-induced seismicity, can no longer be ignored. The occurrence of earthquakes in communities located at proximity to disposal wells with no prior history of seismicity has shocked residents and have caused damages to properties. It has evoked individuals’ resentment against the practice of injection of fracking’s wastewater under pressure into underground disposal wells. Though the oil and gas companies have denied the existence of a link between such a practice and earthquakes and the local and state governments have delayed their responses to the unforeseen seismic events, the issue has gained in prominence among researchers, affected community residents, and the media. This case study has offered a glimpse into the varied responses of stakeholders to human-induced seismicity in a small city in the state of Texas. It is evident from this case study that although individuals’ complaints and protests from a small community may not be successful in bringing about statewide changes in regulatory policies on disposal of fracking’s wastewater, they can add to the public pressure on the state government to do something to address the problem in a state that supports fracking.

Анализ «Методики разработки нормативов допустимых сбросов веществ и микроорганизмов в водные объекты для водопользователей» в общем контексте водоохранного законодательства (в порядке обсуждения)

2020 ◽  
Author(s):  
I. Saakian ◽  
Aleksandr, Grigor’ev ◽  
E. Kravets ◽  
E. Rudakov ◽  
A. Faddeev ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Bodies ◽  
Anthropogenic Factors ◽  
Water Protection ◽  
Best Available Technologies ◽  
Process Indicators ◽  
Water Users ◽  
Quality Of Water ◽  
Protection Legislation ◽  
The Impact

Выполнен анализ действующей редакции Методики разработки нормативов допустимых сбросов веществ и микроорганизмов в водные объекты для водопользователей , утвержденной приказом Минприроды России от 17 декабря 2007 г. 333, на предмет непротиворечивости и соответствия нормам водоохранного законодательства. Выявлена неопределенность применения Методики в условиях воздействия на качество воды природных и антропогенных факторов, не зависящих от конкретного водопользователя. Положения Методики противоречат принципам нормирования воздействия на водные объекты на основе наилучших доступных технологий, что было показано на примерах утвержденных технологических показателей содержания загрязняющих веществ в сточных водах различных отраслей промышленности. Анализ системы нормирования допустимых воздействий на водные объекты и географической дифференциации нормативов качества воды в пределах Российской Федерации вместе с системой целевых показателей качества воды также показал несоответствие Методики основным принципам водоохранного законодательства.The analysis of the current edition of the Methods of developing standards for permissible discharges of substances and microorganisms into water bodies for water users , approved by the Order of the Ministry of Natural Resources of Russia dated December 17, 2007 No. 333 for consilience and compliance with the regulations of the water protection legislation, is carried out. Uncertainty of the application of the Methods in the conditions of the impact of natural and anthropogenic factors that are independent of a specific water user on the quality of water has been identified. The provisions of the Methods contradict the principles of regulating the impact on water bodies based on the best available technologies shown on the examples of approved process indicators of the concentrations of various industrial pollutants in wastewater. An analysis of the system of regulating the permissible impact on water bodies and the geographical differentiation of water quality standards within the boundaries of the Russian Federation, together with the system of water quality targets, also showed that the Methods do not comply with the basic principles of the water protection legislation.

scholarly journals Discursive Strategies and Sequenced Institutional Change: The Case of Marriage Equality in the United States

2021 ◽  
pp. 003232172110205
Author(s):  
Giulia Mariani ◽  
Tània Verge
Keyword(s):  
United States ◽  
Institutional Change ◽  
The United States ◽  
Marriage Equality ◽  
Agent Based ◽  
Discursive Strategies ◽  
Policy Debates ◽  
The Status ◽  
Private Actors

Building on historical and discursive institutionalism, this article examines the agent-based dynamics of gradual institutional change. Specifically, using marriage equality in the United States as a case study, we examine how actors’ ideational work enabled them to make use of the political and discursive opportunities afforded by multiple venues to legitimize the process of institutional change to take off sequentially through layering, displacement, and conversion. We also pay special attention to how the discursive strategies deployed by LGBT advocates, religious-conservative organizations and other private actors created new opportunities to influence policy debates and tip the scales to their preferred policy outcome. The sequential perspective adopted in this study allows problematizing traditional conceptualizations of which actors support or contest the status quo, as enduring oppositional dynamics lead them to perform both roles in subsequent phases of the institutional change process.

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