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Length- Weight Relationship, condition factor, Gastro- Somatic - Index and Stomach content analysis of Schizothorax richordsonii ( Gray 1832) in Setikhola, Parbat, Nepal
(2024) Bhattarai, Deepak; Santoshi Shrestha
Schizothorax richardsonii is one of the important major species of an aquatic ecosystem of Setikhola. The main aim of the study is to investigate the length- weight relation, condition factor, gastro-somatic index and Stomach contents analysis of Schizothorax richardsonii. A total of 101 fish individuals were collected seasonally from august 2023 to January 2024 using cast net from Setikhola river. The fishes were measured and weighed using stainless scale and weighing machine respectively before dissecting fish. Qualitative analysis of stomach contents and index of fullness methods were applied for gut content examination. The values of total length and weight varies from 10.3 to 19.6cm and 10.3 to 75.79g respectively. The length-weight relationships of S. richardsonii as calculated on pulled data can be expressed by the equations: W = 0.0059 × TL^3.11 (R 2 = 0.91) for autumn and W=0.024 × TL^2.70 (R 2 = 0.92) for winter. The condition factor ranges from 0.81 to 1.36 during the both seasons indicating fish in good health condition and shows both isometric growth pattern and allometric pattern during both seasons. The mean value of Gastrosomatic index was 11.29 in autumn and 10.21 winter attributed to fish feeding at mdifferent rates. Approximately, 35% of the guts or stomachs were found entirely full followed by moderately full or half-full stomach and only 7% of the stomachs were empty in the winter This fish abundantly feed on green algae most followed by trichopteran and dipteran larvae so consider as omnivore in nature.
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Taxonomic Diversity of Genus Tar ( Gray 1834 ) in Kali Gandaki River, Nepal
(2024) Rana, Pawan; Santoshi Shrestha
Tor species is a member of the family Cyprinidae, which is widely recognized as game fish inhabiting in fresh water ecosystem. The aim of this study is to explore the taxonomic diversity, morphometric and meristic characters of Genus Tor (Gray, 1834) of Kali Gandaki River, Nepal. Thirty-four (34) Tor species were captured from five different sites of Kali Gandaki River. 35 morphometric and 5 meristic characteristics of Genus Tor were examined. On the basis of morphometric and meristic count, only Tor putitora was identified using identification keys and references. The study examined the relationship between body metrics such as total length, head length, and standard length. All morphometric characteristics showed a positive correlation with head length, standard length, and total length. Meristic counts were almost identical to different sites of Tor putitora of Kali Gandaki River. The results of this study may be useful in management and conservation of population of Tor putitora in Kali Gandaki River which is listed in IUCN Red List of Endangered species.
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Master Level Course of Study Political Science 1st & 2nd Year, 2009
(Curriculum Development Centre, TU., 2009) Curriculum Development Centre, TU; Not