scholarly journals Indigenous Freshwater Ichthyofauna in the Dhanu River and Surrounding Wetlands of Bangladesh: Species Diversity, Availability, and Conservation Perspectives

Conservation ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 241-257
Author(s):  
Debasish Pandit ◽  
Shuva Saha ◽  
Mrityunjoy Kunda ◽  
Ahmed Harun-Al-Rashid
Keyword(s):  
Fish Species ◽  
Anthropogenic Impacts ◽  
Public Awareness ◽  
Conservation Status ◽  
Habitat Preferences ◽  
National Level ◽  
Fish Population ◽  
Population Trends ◽  
Fish Diversity ◽  
Wallago Attu

A checklist of the native fishes of the Dhanu River and adjacent waters at Mithamain Upazila under the Kishoreganj district of Bangladesh is prepared with details on their availability, conservation status, habitat preferences, population trends, and threats. Data were collected monthly by field survey, focus group discussions, and personal interviews by using a semi-structured questionnaire and a pictorial check list of fish species. A total of 91 indigenous fish species of 59 genera belonging to 29 families under 11 orders were documented where 17.6%, 27.5%, 31.9%, and 23.1% species were abundantly available, commonly available, moderately available, and rarely available, respectively. Among those, 24 fish species (26.4%) were under the threatened category (3 critically endangered, 11 endangered, and 10 vulnerable) according to the IUCN Bangladesh. Notably, the globally threatened Cirrhinus cirrhosus, Channa orientalis, and Wallago attu were available in the study area. Fish population trends of 24.2% and 59.3% of the entire fish species were found in decreasing trends at the global and national level, respectively. The leading threats to the fish diversity were indiscriminate overfishing followed by fishing by dewatering of wetlands, the katha fishing method, the use of deprecated fishing gears, etc. Minimizing anthropogenic impacts, enacting fishing laws, installing and managing fish sanctuaries, and raising public awareness can be effective for the conservation of existing fisheries resources.

scholarly journals A Checklist of Indigenous Ichthyofauna in the Dhanu River and Surrounding Wetlands of Bangladesh: Current Status, Population Trends and Threats

2021 ◽  
Author(s):  
Debasish Pandit ◽  
Shuva Saha ◽  
Mrityunjoy Kunda ◽  
Ahmed Harun-Al-Rashid
Keyword(s):  
Fish Species ◽  
Anthropogenic Impacts ◽  
Public Awareness ◽  
Habitat Preferences ◽  
National Level ◽  
Population Trends ◽  
Current Status ◽  
Fish Diversity ◽  
Check List ◽  
Wallago Attu

This study was conducted in the Dhanu River and adjacent waters at Mithamain upazila (sub-district) under Kishoreganj district of Bangladesh to prepare a check list of available native fishes with their availability status, conservation perspectives, habitat preferences, population trends and intimidations. Data were collected monthly by direct field survey, focus group discussions, and personal interviews with fishers by using a semi-structured questionnaire and a pictorial check list of fish species. A total of 91 indigenous fish species of 59 genera belonging to 29 families under 11 orders were documented where 17.58% species was abundantly available, 27.47% was commonly available, 31.87% was moderately available and 23.08% was rarely available. Cypriniformes was found as the dominant order, consisting 37.36% of the fish species aggregation and Cyprinidae was the most dominant family with 32.97% of the entire species assemblage. Twenty four piscine species (26.37%) were under threatened category in Bangladesh which subsumed 3 critically endangered (3.29%), 11 endangered (12.08%), and 10 vulnerable species (10.99%). Notably globally threatened Cirrhinus cirrhosus, Channa orientalis, and Wallago attu were available there. Fish population trends of 24.18% and 59.34% of the entire fish species was found in decreasing trends in global and national level, respectively. Leading intimidation to the fish diversity was indiscriminately overfishing, followed by fishing by dewatering of wetlands, katha fishing method, use of deprecated fishing gears, climate change, etc. Minimization of anthropogenic impacts, assuring the flux of water round the year, enactments of fish laws, installation and management of fish sanctuaries, and raising public awareness can be effective for the conservation of existing fisheries resources.

scholarly journals Status of fish diversity in Surha Taal, a natural lake in the floodplains of river Ganga, in Ballia District, Uttar Pradesh, India

2020 ◽  
Vol 67 (3) ◽  
Author(s):  
A. K. Pathak ◽  
U. K. Sarkar ◽  
Rehana Abidi
Keyword(s):  
Species Diversity ◽  
Fish Species ◽  
Conservation Status ◽  
Fish Diversity ◽  
Important Species ◽  
Post Monsoon ◽  
Natural Lake ◽  
Wallago Attu ◽  
River Ganga ◽  
Near Threatened

The study presents the status of fish diversity, abundance and habitat structure of Surha Lake, which is a perennial and natural lake fed by the river Ganga. The study was conducted between 2011 to 2013 covering pre and post-monsoon seasons. In total, 4,852 individual fish specimens were collected representing 66 fish species belonging to 23 families. The species diversity comprised 65 species in pre-monsoon and 60 species in post-monsoon season (p<0.05). The highest species diversity was recorded for the family Cyprinidae (22), followed by Bagridae (7). An assessment of conservation status of 66 fish species as per IUCN Red List 2019 criteria listed 6 species under near threatened (NT), 54 under least concern (LC) and two species under vulnerable (VU) category. The study reports several commercially important species under near threatened (Chitala chitala, Labeo pangusia, Ompok bimaculatus, Ompok pabda, , Ailia coila and Bagarius bagarius), which makes Surha Taal an important natural lake from fishery management point of view. The study also prioritised different habitat types important for different species. The slow water in the mid-channel areas of the lake were categorised as important habitats for near threatened and vulnerable fish species like C. chitala, B. bagarius and Wallago attu, which can be prioritised for population level management.

scholarly journals Broad and fine-scale threats on threatened Brazilian freshwater fish: variability across hydrographic regions and taxonomic groups

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Murilo Luiz e Castro Santana ◽  
Fernando Rogério Carvalho ◽  
Fabrício Barreto Teresa
Keyword(s):  
Freshwater Fish ◽  
Habitat Loss ◽  
Fish Species ◽  
Threatened Species ◽  
Environmental Changes ◽  
Anthropogenic Impacts ◽  
Conservation Status ◽  
Fine Scale ◽  
Hydrographic Regions ◽  
Taxonomic Groups

Abstract: Anthropogenic environmental changes are the main cause of species extinction during the Holocene. Species have been exposed to major source of threats, such as habitat loss and fragmentation, pollution, introduced species, and harvesting, many of which are derived from specific anthropogenic activities, such as urbanization, agriculture, and damming (i.e. fine-scale threats). However, the importance of these threats on the species conservation status in a given region depends on the type of impacts they are exposed to and the susceptibility of species to these impacts. In this study, we used a database of threatened Brazilian freshwater fish species to test whether the major source of threats and the specific anthropogenic impacts to species vary across hydrographic regions and taxonomic groups. Our results showed that habitat loss is a ubiquitous major threat jeopardizing the conservation status of the Brazilian fish species. However, different fine-scale threats mediate this process across hydrographic regions and taxonomic groups. The combination of impacts from agriculture, deforestation, and urbanization affects most of the threatened species in the basins of the Northeast, South, and Southeast, including the species of the most threatened order, the Cyprinodontiformes. Damming is the main human activity affecting threatened species of Siluriformes, Characiformes, Gymnotiformes, and Cichliformes, especially in northern basins (Amazon and Tocantins-Araguaia). Therefore, we found that specific fine-scale threats influencing threatened species vary across hydrographic regions and taxonomic groups, probably due to geographic variability in the incidence of human activities and differential niche requirements and vulnerability of species to these activities.

scholarly journals Study of indigenous freshwater fish diversity of Bankura (West Bengal), India with special reference to Clarias batrachus

2018 ◽  
Vol 10 (4) ◽  
pp. 1162-1172
Author(s):  
Arindam Ganguly ◽  
Amrita Banerjee ◽  
Asish Mandal ◽  
Tapas Kumar Dutta ◽  
Pradeep Kumar Das Mohapatra
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
West Bengal ◽  
Clarias Batrachus ◽  
Fish Diversity ◽  
African Catfish ◽  
Hypophthalmichthys Molitrix ◽  
Local Markets ◽  
Wallago Attu ◽  
Bankura District

A study was conducted to determine the ichthyofaunal diversity in Bankura district of West Bengal. The area is traversed by major and minor rivers, feeder channels, numerous ponds, bills, reservoirs which have made this drought-trodden district as the highest producer of aquatic products within the state. Field survey was conducted in randomly selected local markets covering twenty-two blocks of Bankura. Fish sampling was carried out using various conventional fishing gears. The entire region harbours a wide variety of aquatic fishes. A total number of 92 indigenous fish species belonging to 30 families were identified during this study. The Cyprinidae family dominated the population with its 36 varieties followed by Channidae, Siluridae and Bagridae. Sonamukhi block situated in Shali basin; Sarenga and Raipur of Kangsabati basin; Dwarkeshwar and seven bundhs- enriched Bishnupur were the major habitats of small indigenous fishes. This paper also denotes presence of 12 globally endemic freshwater fish species viz. Hypophthalmichthys molitrix, Cyprinus carpio, Labeo nandina, Tor khudree, Chitala chitala, Bagarius bagarius, Wallago attu, Ompok pabda, Ailia coila, Anguilla bengalensis, Parambassis lala, Oreochromis mossambicus. The substitution of native Clarias batrachus with invasive African catfish C. gariepinus was observed in various local markets. Some traders even promote illicit farming of this banned species for their own profit. As a consequence, the indigenous, nutritionally-enriched C. batrachus is becoming more endangered.

Ichthyofaunal Diversity of River Kapaleswari at Paschim Medinipur District of West Bengal, India

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
Arun Jana ◽  
Godhuli Sit ◽  
Angsuman Chanda
Keyword(s):  
Fish Species ◽  
West Bengal ◽  
Economic Value ◽  
Fish Population ◽  
Individual Species ◽  
Fish Diversity ◽  
Faunal Diversity ◽  
Data Deficient ◽  
Future Policy ◽  
First Time

The present study has been conducted on ichthyofaunal diversity of river Kapaleswari flowing through Paschim Medinipur district of West Bengal, India. Results reveal the existence of 56 indigenous fish species under 22 families of 8 orders and the order Perciformes represents the largest diversity with 8 families and 20 species. Cyprinidae is the most dominant family; contributed 26.79% species. Two species namely Stigmatogobius sadanundio & Gobiopsis macrostoma have been first time recorded from Paschim Medinipur district of West Bengal. Among the recorded fish species of Kapaleswari River, 47.07% were used as food-fish, 1.79% used as ornamental & the remaining 57.14% were used as both food and ornamental. So, maximum fish species have important socio-economic value for the development of local people proximate to the Kapaleswari River. The values of the Shannon-Weaver index (H) range from ‘3.58’ to ‘3.79’ & the Simpson’s index (D) from ‘0.023’ to ‘0.032’ among the sampling sites are indicative to diverse fish population in Kapaleswari River. The result of species evenness has been concluded that individual species are near to disturb condition at Kapaleswari river. According to IUCN ver. 2020.1, status of the fishes in the river depicts, 75% are Least Concern, 3.57% are Vulnerable, 8.93% are Near Threatened, 10.71% are Not Evaluated & 1.71% are Data Deficient. As per local status 71.42% of fishes of this river are under risk and need immediate conservation to protect them from extinction. Hence, the work is a documentation of macro faunal diversity of Kapaleswari river as well as regional level for helpful for future researchers and policy planners and also helpful to formulate the future policy for conservation and management of the fish diversity in the river Kapaleswari.

scholarly journals Pollution Problem in River Kabul: Accumulation Estimates of Heavy Metals in Native Fish Species

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Habib Ahmad ◽  
Ali Muhammad Yousafzai ◽  
Muhammad Siraj ◽  
Rashid Ahmad ◽  
Israr Ahmad ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fish Species ◽  
Fish Population ◽  
Native Fish ◽  
Nickel Copper ◽  
Wallago Attu ◽  
Zinc Cadmium ◽  
Copper Zinc ◽  
Cadmium And Lead ◽  
River Kabul

The contamination of aquatic systems with heavy metals is affecting the fish population and hence results in a decline of productivity rate. River Kabul is a transcountry river originating at Paghman province in Afghanistan and inters in Khyber Pakhtunkhwa province of Pakistan and it is the major source of irrigation and more than 54 fish species have been reported in the river. Present study aimed at the estimation of heavy metals load in the fish living in River Kabul. Heavy metals including chromium, nickel, copper, zinc, cadmium, and lead were determined through atomic absorption spectrophotometer after tissue digestion by adopting standard procedures. Concentrations of these metals were recorded in muscles and liver of five native fish species, namely,Wallago attu,Aorichthys seenghala,Cyprinus carpio,Labeo dyocheilus, andOmpok bimaculatus. The concentrations of chromium, nickel, copper, zinc, and lead were higher in both of the tissues, whereas the concentration of cadmium was comparatively low. However, the concentration of metals was exceeding the RDA (Recommended Dietary Allowance of USA) limits. Hence, continuous fish consumption may create health problems for the consumers. The results of the present study are alarming and suggest implementing environmental laws and initiation of a biomonitoring program of the river.

scholarly journals Diversity, potentiality, and conservation status of fish fauna in the upper Mahakam’s tributaries, East Kalimantan

2019 ◽  
Vol 19 (3) ◽  
pp. 391
Author(s):  
Jusmaldi Jusmaldi ◽  
Nova Hariani ◽  
Norbeta Doq
Keyword(s):  
Fish Species ◽  
Diversity Index ◽  
Conservation Status ◽  
Fish Fauna ◽  
Iucn Red List ◽  
Fish Diversity ◽  
East Kalimantan ◽  
Wiener Diversity Index ◽  
Data Deficient ◽  
Almost All

Diversity, potentiality and conservation status of fish fauna in upper Mahakam’s tributaries of east Kalimantan is unknown. The purposes of this study were to analysis species diversity, determine potentiality and conservation status of fish fauna in upper Mahakam’s tributaries, east Kalimantan. Fish sampling with purposive method was conducted in four tributaries, i.e Tepai River, Pahangai River, Danum Parai River, and Meraseh River for one month. Fishes were collected by several gears type. The results of this research showed that the total number of fish caught was 820 individuals; consist of 26 species, 7 families, and 4 orders. The Cyprinidae was the most dominant family found in all tributaries. The Shannon-Wiener diversity index in four tributaries were varied and ranging from 1.749-2.087. The highest fish diversity was recorded at Maraseh River followed by Pahangai River, Danum Parai River, and Tepai River. The low fish diversity was discovered at Tepai River may be due to differences in substrate type, water velocity, and water depth as compared to the Maraseh River, Pahangai River, Danum Parai River. The fish species similarity coefficient between four tributaries ranged from 0.606-0.842 and the highest dissimilarity was found between Tepai River and Danum Parai River. Almost all fishes categorized as edible fish for local consumption. Syncrossus hymenophysa and Gastromyzon lepidogaster have potential as ornamental fish. Regarding IUCN red list status, six fish species were grouped into least concern status, two species as data deficient, one species as near threatened, one species as endangered species and 16 other species were not on the list.

scholarly journals Water Quality and Conservation Status of Fish Fauna of Main Outfall Drain, Al-Diwaniya City, Iraq

2021 ◽  
Vol 910 (1) ◽  
pp. 012062
Author(s):  
Kadhim J.L. Al-Zaidy
Keyword(s):  
Water Quality ◽  
Freshwater Fish ◽  
Fish Species ◽  
Lower Risk ◽  
Fish Community ◽  
Conservation Status ◽  
Fish Fauna ◽  
Fish Diversity ◽  
Ecological Indices ◽  
The Third

Abstract Freshwater fish diversity, abundance, the ecological indices, and water quality from Main Outfall Drain (MOD) in Al-Diwaniya City/middle Iraq were studied monthly from January to December 2017 in two sites. The present study has shown that the third river (MOD) supported 15 fish species belonging to 7 families. As far as biodiversity status in fish community (IUCN-2019) is concerned, out of 15 species, eleven fish species are categorized into Lower risk least concern (LC or LR/lc), four Vulnerable (VU). Eight species were sensitive to salinity; seven species were tolerance. The results were concluded that the properties of water were tolerable for the fish community. Ultimately, it can be concluded that the sector of MOD supported the fish community. But it needs constant monitoring for the conserve and development of the diversity and the case of the healthy fish.

scholarly journals Fish diversity of Haryana and its conservation status

2016 ◽  
Vol 8 (2) ◽  
pp. 1022-1027
Author(s):  
Anita Bhatnagar ◽  
Abhay Singh Yadav ◽  
Neeru Neeru
Keyword(s):  
Fish Species ◽  
Lower Risk ◽  
Global Climate ◽  
Conservation Status ◽  
Climate Change Impacts ◽  
Habitat Destruction ◽  
Fish Diversity ◽  
Species Introduction ◽  
Fish Biodiversity ◽  
River Yamuna

The present study on fish biodiversity of Haryana state was carried out during 2011 to 2014. A total number of 59 fish species inhabits the freshwaters of this state. Maximum number of fish species belonged to the order Cypriniformes (35) followed by the order Siluriformes (12) and Perciformes (8). The orders Beloniformes,Clupeiformes, Osteoglossiformes and Synbranchiformes were represented by only one species each. Out of 59 fish species, 2 are endangered, 11 vulnerable, 28 have lower risk of threat, 8 exotic and 4 fish species have lower risk least concern. The conservation status of six fish species has not been evaluated so far, hence they cannot be included in any of the IUCN categories at this moment. Family Cyprinidae alone contributed 32 fish species followed by Bagridae family. Fish species Parapsilorhynchus discophorus was observed for the first time in Haryana waters. This species is the native of Kaveri river basin, the occurrence of this species in river Yamuna may be attributed to some religious activity of people. A decline in fish diversity has been recorded from 82 species in 2004 to 59 species in the present study in the year 2014. The main causes for decrease in fish biodiversity are habitat destruction and fragmentation, changing practices of land use, exotic species introduction, fishing, irrigation needs, pollution and global climate change impacts. It is essential to prevent further decline of fish resources by devising all possible measures of conservation and rehabilitation.

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