Haematological Assessment on Toxicity of Fungicide Hexaconazole on Post larvae of Macrobrachium rosenbergii (de Man)
Haematological Assessment on Toxicity of Fungicide Hexaconazole on Post larvae of Macrobrachium rosenbergii (de Man)
Date
2016
Authors
Sisodia, A.V
Bijoy, V.M
Harikrishnan, M
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India)Cochin
Abstract
The objective of the study was to determine the LC50
(96 h) of the fungicide Taqat (Captan, Hexaconazole)
on post larvae of Macrobrachium rosenbergii (de Man).
Prawns of average length 1.98 cm were exposed to
taqat at concentrations of 0, 0.02, 0.04, 0.06 and 0.08
mg L-1. The LC50 of Hexaconazole at 96 h was found
to be 0.064 mg L-1. Total haemocyte count (THC) of
prawns in response to exposure to sublethal
concentrations of taqat increased in test groups
(7.87±5.96 to 1877.5±1622.3) were noticed. Significant
changes in physiological and behavioural
patterns were noticed. Differential haemocyte count
(DHC) showed elevated agranulocytes (63.66±6.60
to 81.76±1.60) when compared to granulocytes
(5±1.7 to 34.72±3.6) in experimental groups. Changes
in blood clotting time (30.00±2.32 to 166.66±2.88)
were also noticed between control and test groups
indicating possible signs of stress in exposed
animals. Present results demonstrate the risks
involved in farming of M. rosenbergii near rice farms
where these fungicides are routinely used.
Description
Keywords
Fungicide; taqat; Macrobrachium rosenbergii; lethal toxicity
Citation
Fishery Technology 53(1):64 - 68