Author : Merin Mathew 1
Date of Publication :20th May 2016
Abstract: The present study has been undertaken to identify the most ideal species that can be used as a bio-indicator in automated bio-monitors. Six different fish species were exposed in a 50% effluent from sewage treatment plant and in open well water (control) for 48 hours. Using an automated bio-monitor named "Multispecies Freshwater Bio-monitor©" developed by Lim Co International, GmbH, Konstanz, Germany was used for continuous monitoring of the behaviour of fish species in both control and effluent. The six fish species used were Etroplus suratensis, Puntius denisonii, Xiphophorus maculatus, Poecilia reticulata and Oreochromis mossambicus. All the six species were in juvenile stage and almost same in size (2-3 cm). O. mossambicus and E. suratensis were identified as the ideal bio-indicators which gives an early warning (stress ventilation, avoidance behaviour followed by reduced movement activity) to the effluent from treatment units. All the other species were observed as more sensitive to effluent.
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