Spatiotemporal of fish assemblage structure Pathariya river of Kalali district, Farwestren Nepal
Date
2019
Authors
Neupane, Netra Prasad
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Zoology
Abstract
The spatial and temporal variations of the fish assemblages in Pathariya River, Western
Nepal is poorly understood. To examine the fish assemblage structure, fish samples were
collected in seasonal basis from four sites of the river by using cast net and gill net. A
total of 407 individuals belonging to 4 orders, 8 families, 16 genera and 25 species were
collected from Malbhanga, Thakurwdara, Sonalipur and Dhunganatol of Pathariya River.
Majority of the fishes belonged to the family Cyprinidae (53.56 followed by Bagridae
(17.44, Mastacembelidae (11.31 Channidae (8.11, Cobitidae (5.65, Claridae
(1.72, Nandidae (1.47 and Siluridae (0.74. The most abundant species were
untus tcto untus sohore, and Mystus tengra The highest diversity index (2.96 and
species richness (22 of fish were recorded from station D (Dhunganatol in autumn
season (September. Lowest diversity index (1.67 and species richness (6 were found in
station A (Malbhanga during the spring season (March. The redundancy analysis (RDA
revealed significant correlations between fish assemblage and environmental variables
The environmental variables such as transparency, dissolved oxygen, pH, hardness,
velocity, and temperature were most strongly correlated with the fish community
composition. The difference in fish assemblage structure and diversity in Pathariya River
are probably related to habitat type, altitude, season, several environmental factors and
anthropogenic activities.
Description
Keywords
Chemical analysis, Environmental factors, Environmental variables