Comparative
study on cadmium accumulation and its toxicity in
fish
fry of Labeo rohita and Cyprinus carpio
S.K.
Vadlamani1,2, C.K.Basuri2 and P.R. Yallapragada2*
1Department of
Zoology, Maharajah's Autonomous College, Vizianagaram - 535 002, India
2Department of
Zoology, Andhra University, Visakhapatnam - 530 003, India
*Corresponding Author
E-mail: yprabhakararao@yahoo.com
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Key
words
Cadmium accumulation
Cyprinus carpio fry
Growth parameters
Labeo rohita fry
Toxicity
Publication Data
Paper received : 08.05.2017
Revised received : 18.07.2017
Re-revised received :
13.10.2017
Accepted : 13.12.2017 ?????
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Abstract
Aim: Metal
contamination in aquatic systems has been getting much attention during last
few decades because of its persistent and toxic nature. Since cadmium is one
of the most toxic metals, this study was carried out to investigate the
tolerance, metal accumulation and growth on the fry of freshwater fishes Labeo
rohita and Cyprinus carpio.? ??
Methodology:
The
fry of Labeo rohita and Cyprinus carpio were collected from
fish breeding ponds of Kadiyam and Dwarapudi, East Godavari, Andhra Pradesh,
India. The toxic effect of cadmium on fish fry was determined by following
static renewal bioassay methods. Growth parameters such as total length, wet
weight and dry weight of fish fry were measured when exposed to sub lethal
concentration (0.1998 ppm and 4.938 ppm for L. rohita and C. carpio
respectively) of cadmium. Metal accumulation was estimated with atomic
absorption spectrophotometer.? ?
Results: Initially the LC50 concentrations of
cadmium for the fry of L. rohita (0.994 ppm) and C. carpio
(24.69 ppm) were determined by exposing them to different concentrations of
metal. These studies revealed that the fry of L. rohita was
more sensitive to cadmium than that of C. carpio. When exposed to
their sub lethal concentration, the response was different in the fry of both
fish. In L. rohita, maximum decrease of 7.3%, 10.24% and 16.32% was
observed in mean length, wet weight and dry weight respectively over their
relevant controls at 20 days exposure. In comparison, C. carpio
registered more decrease in mean length, wet weight and dry weight (16.95%,
11.2% and 41.96%) under similar conditions as above. These results were
substantiated by metal accumulation studies.?? ??
Interpretation:
To
determine the impact of cadmium toxicity, larval phase (fry) should be
considered as an important stage. Cadmium is known to accumulate in tissues
of Labeo rohita and Cyprinus carpio fry resulting in reduction
of growth significantly with respect to their control.
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regarding the authenticity of the data, and the acceptability of the
conclusions enforced or derived, rest completely with the author(s).
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