Length-Weight Relationship, Condition Factor and Stomach Content Analysis of Eutropiichthys murias (Hamilton,1822) from Narayani River, West Nawalparasi, Nepal
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Authors
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Department of Zoology
Abstract
Eutropiichthys murius is the major fish of the riverine ecosystems in Narayani River. The
primary goal of this study is to investigate the length-weight relationship, condition factor, and
stomach content analysis of Eutropiichthys murius. A total of 200 fish samples were collected
seasonally from June 2022 to November 2022 with the help of local fishermen by the using cast
and hook net. The overall length ranged from 8.5 cm to 39.2 cm, with weights ranging from 7.4g
to 395.6g. For the Summer and Autumn seasons, the length-weight relationship was W= 0.218 x
TL
2.607
(R
2
= 0.879) and W = 0.0096 x TL
2.960
(R
2
= 0.9105), respectively, indicating a negative
allometric growth pattern in E. murius. In E. murius, the values of b for the summer and autumn
seasons were 2.607 and 2.960, respectively, indicating a negative allometric growth pattern. The
length and weight of this fish did not significantly correlate with one another in two seasons. The
condition factor (K) range between 0.33 to 3.06 with mean value 0.77 indicated that the river’s
fish population was not prospering. From the total number (200) of fishes, 138 (69%) stomach
were observed with food and remaining 62 (31%) were empty. Insects, aquatic plants, and
detritus constitute the majority of the food items found in the stomach of the fish. Polyrhachis
spp, Acridida spp, Caribidi spp, Leptocorisa spp, Stipa tenacissima, Hydrilla verticella, water
beetles, zooplanktons, miscellaneous items and non-biotic matters constitute the majority of this
fish’s basic diet. In conclusion, E. murius was omnivorous and displayed negative allometric
growth.