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Title: Temporal variation of condition and prey-predator status for a schilbid catfish Eutropiichthys vacha (Hamilton, 1822) in the Ganges River, northwestern Bangladesh through multi-model inferences
Authors: Khatun, D
Hossain, M Y
Hossen, M A
Rahman, O
Hossain, M F
Islam, M A
Rahman, M A
Mawa, Z
Hasan, M R
Rahman, M A
Vadas J, R L
Keywords: Bangladesh;Eutropiichthys vacha;Ganges River;Multiple condition factors;Rainfall;Relative weight;Temperature
Issue Date: Jul-2020
Publisher: NISCAIR-CSIR, India
Abstract: The current study provide the baseline information on the temporal (monthly) variations of condition through multiple functions (allometric, KA; Fulton’s, KF; relative, KR) and prey-predator status through relative weight (WR) for Eutropiichthys vacha (Hamilton, 1822) from the Ganges River, northwestern Bangladesh over one year. The smallest individuals were 6.5 and 6.2 cm in TL, whereas the largest were 19.9 and 20.6 cm in TL for males and females, respectively. No significant differences were observed in the length frequency distribution, LFDs (p = 0.8152) for both sexes. KF was significantly correlated with TL for both sexes (p < 0.001) and KF was treated as the best condition factor therefore, well-being of E. vachaa. There was no significant correlation among TL vs KA, TL vs KR and TL vs WR for males and females, respectively. But BW showed highly significant correlations with all condition factors, i.e., BW vs KA; BW vs KF; BW vs KR, and BW vs WR (p < 0.001) for both sexes. Additionally, WR revealed no significant dissimilarities from 100 for males (p = 0.432) unlike females (p = 0.023), based on Wilcoxon signed-rank tests, suggesting that habitat was more suitable for males than females for food availability relative to predator presence. Moreover, this study assessed for the first time the effect of temperature and rainfall on monthly KF for E. vacha in the Ganges River. The Pearson correlation test found no significant relation between temperature and KF (r = 0.2226, p = 0.4868 for males; r = 0.2172, p = 0.4977 for females), but significant correlations were found between rainfall and KF (r = 0.6357, p = 0.0263 for males and r = 0.6983, p = 0.0115 for females).
Page(s): 1229-1237
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.49(07) [July 2020]

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