Browsing by Subject "Fish species"
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Item Assessment of Organophosphate toxicity in economically important fish species of Nepal(Institute of Science and Technology, Zoology, 2022) Kunwar, Prabesh SinghAvailable wih full texItem Effect of Ovulin on Induced Breeding in Rohu (Labeo rohita Hamilton, 1822) and Naini ( CirrhinusMrigala Hamilton, 1822) at Fish Development and Training Centre, Janakpur Nepal(Department of Zoology, 2017) Sah, RajeshwarAvailable with full textItem Spatio-Timporal Variation in Fish Assemblage Structure of Upper Rapti River, Mid-Western Nepal(Department of Zoology, 2019) Sharma, HiramaniThe spatial and temporal variations of fish assemblages in Nepalese rivers and streams is poorly known. The fish community and environmental factors of the Upper Rapti River were studied four times a year, spanning all seasons (summer, winter, autumn, and spring). The fish were agglomerated using a cast net with the assistance of local fishermen from three sample stations encompassing 15 kilometers. The current results indicate that the Upper Rapti River is habitat to 12 species representing 2 Orders, 4 Families, and 9 Genera. The most contributory fish species recorded from Upper Rapti River was Barilius bendelisis (18.34%) followed by Schizothorax plagiostomus (17.22%) and Schizothorax labiatus (15.31%). Kruskal-Wallis test was applied where p-value was observed 0.068 among seasons and 0.266 along stations so there was no significant difference in the abundance of fish among stations and seasons. Physical and chemical variables have a significant role in determining the condition of the fish community. Throughout a year, the mean Shannon-Weiner diversity index was 2.2 and species richness was maximum 2.2 during spring and least 1.6 during autumn. With a mean score of 0.9, species evenness was almost identical in all seasons. The RDA results showed that environmental elements such as pH, total hardness, free carbon dioxide, DO, and water temperature influence the fish community structure of the Upper Rapti River. The cluster analysis shows that the associations between fish assemblages and abundance of fishes. The research might contribute to the preservation of locally adapted fish in the Upper Rapti River as well as the advancement of information about the diversity of fish in Nepal.Item Species Diversity, Distribution and Status of Fishes in Tinau River, Nepal(Department of Zoology, 2015) Rijal, BikramA study was conducted to assess the fish diversity, distribution, abundance and status of fishes in Tinau River. The Tinau River supports for the habitat of many fresh water fishes of many types like carps, barbs, minnows, catfishes, eels etc. The study was focused on the diversity pattern of fishes and data was collected through selecting the sampling site and the field was visited on 4 different seasons. The study revealed that total 26 fish species have been collected from the Tinau River, belonging to 4 orders, 9 families and 19 genera. The most commonly observed fish species during the study period were Barillus bendelensis and Puntius sophore and Garra spp. Similarly, Tor tor and Brachydenio rerio were rare caught fishes. The physiochemical parameters were found to be related with the composition and distribution of the fished in Tinau River. Highest Shannon weiner diversity index was observed in station IV (1.14) and in the month of July (1.11). Similarly, the maximum richness was observed in station IV (6.63) and in the month of April (9.97). Evenness index was found to be higher in January (0.97) and in the station III (1.18). No significant difference in the diversity status was obtained during the investigation period rather it was a seasonal phenomenon in the composition of fish species.