Study of the fresh water fish diversity of Koshi river of Nepal (original) (raw)
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The present study has shown that studied Hooghly river sector supported 87 fish species belonging to 12 orders, 39 families and 69 genera. The order Perciformes was dominant with 8 families and 25 number of fish species followed by the order Siluriformes with 8 families and 24 number of fish species. Fish diversity was assessed by calculating the various diversity indices such as Shannon-Wiener index (H /), Simpson's dominance index (C) and evenness index (J). Higher H / value (3.694) observed in post monsoon and lowest (2.398) in monsoon. High evenness value (0.6930) was recorded during monsoon period. Seasonal water quality parameters such as water temperature (o C), pH, DO, nitrate and phosphates has been recorded and were found suitable for fish population.
ENVIRONMENTAL VARIABLES AND FISHERIES DIVERSITY OF THE NUWA RIVER, PANCHTHAR, NEPAL
Scientific World, 2020
The fish samples were collected from October 2017 to June 2018 in Nuwa River from four sampling stations by using cast net, bamboo fish trap and mosquito nets. Environmental parameters: water temperature, dissolved Oxygen (DO), CO 2, pH, hardness and water velocity were analyzed during each field visit. Eight fish species were collected in present study. The most copious species were Schizothorax plagiostomus, and Schistura multifaciatus. Shannon-Weiner fish diversity index and species richness recorded were highest at station I and lowest at station III, similarly, evenness index was highest at station I and lowest at station III. The water volume, water depth, and the availability of substrates were found to be major influential factors for the weight and length of the fishes. The redundancy analysis (RDA) portrayed that environmental variables like dissolved oxygen, free-carbon dioxide, and pH were found to be pivotal variables to shape the fish assemblage structure of Nuwa River. The cluster analysis delineated that similarity between fish species subsided as the distance of sites turgid.
Assessment of Fish diversity of Tunga River, Karnataka, India
In the present study, an effort has been made to investigate the fish resources quantitatively by studying the ichthyofaunal biodiversity of Tunga River stretch from Gajanoor fishing village to Kudali of Shivamogga district. Monthly sampling was conducted at three centres during July 2010-June 2012 by using gill nets. A total of 45491 kg fishes from three landing centres were collected and Gondichatnalli recorded maximum followed by Shivamogga and Honnapura. The most abundant fish species was Calta catla (28%) followed by Labeo rohita (17%) and Clarias gariepinus (11%). During present investigation a total of 37 species belonging to 11 families and 4 orders were recorded. The order Cypriniformes found to be dominant with 23 fish species followed by Siluriformes 11 species and Perciformes 2 species. Although, 37 species were recorded, the family Cyprinidae recorded 19 fish species (51.35%) followed by Bagridae, 4 fish species (10.81%) and Claridae with 3 fish species (8.10%) each. The Simpson's index of diversity (1-Lambda') was highest in Gondichatnalli (0.8802) followed by Shivamogga (0.8580) and Honnapura (0.8523). This indicated the greater fish biodiversity in Gondichatnalli when compared to other two centres. The biomass of fish species was more in Gondichatnalli (S= 36, N=19014) followed by Shivamogga (S =31, N= 14671), and Honnapura (S =37, N= 11806). Further, the other indices such as Pielou's evenness (J'), Shannon H'(loge) and Simpson 1-Lambda' were also used to assess the richness of biodiversity of all the three fish landing centres. In this study an attempt has been made to evaluate the ichthyofaunal diversity in the region and suggests mitigating measures.
Biodiversitas Journal of Biological Diversity
Ghimire S, Koju NP. 2021. Short Communication: Fish diversity and its relationship with environmental variables in Kamala River, Nepal. Biodiversitas 22: 4865-4871. Kamala River originates from the lower part of the Mahabharat range and flows through inner to outer Terai, providing a broad range of ecosystem services; provisioning, regulating, supporting, and cultural. However, the information regarding the environmental factors and species diversity in the river is not available enough. Hence the study aimed to explore baseline information on the diversity and abundance of fish and their relation to environmental variables. The fish diversity was assessed in five sections of Kamala River and correlated with different environmental variables. The study was carried out during September- October 2019, marking the post-monsoon season of Nepal. Fish samples were collected using cast nets, and physiochemical parameters were analysed onsite and in the laboratory. Altogether 19 freshwater ...
Fish Diversity and Water Quality Parameters of Mechi River, Jhapa, Province No. 1, Nepal
Borneo Journal of Resource Science and Technology
Species diversity is widely recognised as an important trait of functioning and resilient ecosystem. Spatio-temporal patterns of fish community structure in the Mechi River was studied based on stratified random survey, conducted between September 2018 and April 2019. The survey was conducted at three different sampling stations in three different seasons. For the fish sampling, two cast nets of different sizes were used, one having large mesh size of 0.5 cm, 3 m diameter and 2 kg weight and another having mesh size of 2 cm, 6 m diameter and 6 kg weight. In addition, drag net and gill net were also used to collect the fish samples. A total of 1,772 fishes belonging to 4 orders, 8 families, 16 genera and 33 species were documented. The results from the similarity percentage analysis indicated that, the species Schistura devdevi, Brachydanio rerio, Puntius sophore, Barilius barila, Schistura beveani and Puntius terio were the most copious fish species recorded from the Mechi River. On...
Freshwater fish diversity and its conservation status in different water bodies of Nepal
2020
This review describes the current status of freshwater fish diversity, their IUCN categories and threats to fish fauna in Nepal. The freshwater systems of the country are known to harbor over 220 fish species, thereby indicating a rich ichthyofaunal diversity. However, this number varies from author to author. Cyprinidae is the most common and dominant taxon. A total of 15 endemic and 15 exotic fish species have been reported. A total of 34 fish species have been listed under the IUCN Red List threatened categories. Major threats to fish include damming and pollution. Fish diversity studies have mainly focused on inventories only. Studies focusing on river longitudinal aspects, the inclusion of spatio-temporal aspects, and rigorous taxonomic studies combined with genetic studies are crucial to develop strategic conservation measures of fish fauna in Nepal.
Fish diversity studies of two rivers of the northeastern Godavari basin, India
Fish diversity was explored in two rivers of the northeastern Godavari basin: the Adan, tributary of the Painganga, and the Kathani, tributary of the Wainganga. Both rivers are part of the same basin but present different ecological, climatic and anthropogenic settings. Six sites were sampled in each river system over three years using gill nets, cast nets and locally available nets; the ‘catch per unit effort’ criterion was used for sampling. Forty-seven species of fish were identified. Species richness (Jackknife 1 and rarefaction) and diversity measures (Shannon and Simpson) were calculated and their values clearly show that the Kathani is a more diverse ecosystem in terms of fish diversity than the Adan. This difference is mainly due to anthropogenic influences upon the Adan.
Environmental Biology of Fishes, 2018
Assessment of headwater biodiversity is essential for maintaining upstream downstream ecosystem services of rivers. Fish biodiversity assessment was conducted in the headwater tributaries of the glacialfed Tamor River and rain-fed Kamala River in eastern Nepal. A total of eight sites were sampled. pH, dissolved oxygen, conductivity and temperature were estimated using multi-meter field probe. Standard electrofishing was conducted for fish sampling with two rounds of fishing for 20 min each at site. Catch per Unit Effort (CPUE) was calculated for each sample and the samples were identified in the field itself following standard literature. Unidentified samples were brought to the laboratory for further identification. Descriptive statistics was performed; Species richness, Shannon Weiner Diversity and Simpson's Diversity Index were estimated. One way ANOVA and an independent t test were performed respectively to look at the variation in fish abundance between seasons and between the tributaries of the Tamor River and the Kamala River. Threat status categories of the fish species was compared with those of IUCN. pH was neutral to alkaline in both the types of streams. Significant variation (p = 0.01) in seasons as well as between two types of headwater tributaries were observed in pH, temperature and conductivity. Temperature and conductivity were significantly higher in the rain-fed tributaries. These parameters were significantly higher during the pre-monsoon and lowest during the winter in both types of streams. A total of 8940 fishes belonging to four orders, 10 families, 26 genera and 34 species were enumerated. Significant variation in Shannon-Weiner Diversity Index (p = 0.015) and Species Richness (p = 0.005) between the glacial fed and rain fed streams with higher values of these indices in the rain fed tributaries. Fish abundance also varied significantly (p = 0.02) between seasons in the Tamor's tributaries with higher abundance in the pre-monsoon and lowest during the winter. Cypriniformes was the most dominant taxa with Schistura beavani (26.14), Barilius vagra (8.46) and Garra gotyla gotyla (7.63). Schizothorax richardsonii (10.31) and Schistura beavani (47.19) were the most dominant species in the Kamala's and the Tamor's tributaries. These findings Environ Biol Fish
2018
During the last century, riverine ecosystems have affected from intense human interference resulting in habitat loss and degradation and as a consequence, many fish species have become highly endangered, especially in rivers. In my present study three sampling stations were selected along the stretch of river Rupnarayan at Kolaghat. Moreover, Kolaghat thermal power station is located on the right pool of this river. Monthly sampling was collected at three sampling stations (S1, S2 & S3) during July 2015-June 2016 by using gill nets and brought about to the laboratory and analyzed with the standard methods. Total 38 species of fishes belonging to twenty four subfamilies and 9 orders were collected from the selected sampling stations. The ShannonWeiner diversity index of three different sampling indicated a strong relationship with overall species richness, showed variation and ranged from 3.052 –3.278 . The highest fish diversity were recorded at station –I followed by station – III ...