Median Lethal Concentration of Zanthoxylum rhetsa seed extracts on Grass carp Fingerlings (Ctenopharyngodon idella) (Valenciennes, 1844) in Captive Condition
Median Lethal Concentration of Zanthoxylum rhetsa seed extracts on Grass carp Fingerlings (Ctenopharyngodon idella) (Valenciennes, 1844) in Captive Condition
Date
2020
Authors
Jomang, Olik
Behera, S.
Bhakta, Dibakar
Baksi, Snigdha
Saha, Shibam
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India)
Abstract
The bark extracts of the plant Zanthoxylum rhetsa
have been widely used by people of Arunachal
Pradesh as a mean of catching fish. Therefore, the
median lethal concentration (LC50) value of Zanthoxylum
rhetsa bark extracts on grass carp
(Ctenopharyngodon idella) (Valenciennes, 1844) has
been determined in the present study. The seeds of
Z. rhetsa were collected from the forest of Tarak
village, located in the Siang district of Arunachal
Pradesh and the toxicity test was conducted in the
control condition. Five different concentrations of
the extract viz., 25 mg l-1, 35 mg l-1, 45 mg l-1,
55 mg l-1 and 65 mg l-1 were prepared by adding
the extracts proportionately to the water. The LC50
value of Z. rhetsa against C. idella was hosted as 45
mg l-1 for 96 h exposure period. Toxicity of aqueous
solution of Z. rhetsa against fingerlings of grass carp
was found to be time and dose-dependent. It was
found that there was a significant (p<0.05) relationship
between the mortality of the treated fish with
the concentration of seed extract of Z. rhetsa. A very
strong correlation coefficient was found between the
mortality of test fish and exposure of seed extract
of Z. rhetsa (r=0.998) at different concentrations. The
finding established that Z. rhesta has a potential
piscicidal effect on fish and could be used widely
to control unwanted fishes in aquaculture systems.
Description
Keywords
Acute toxicity, LC50 values, Zanthoxylum rhetsa, Ctenopharyngodon idella