Abstract

Automated biomonitoring may provide real-time insight into cause/effect relationships between developing toxicity and a representative aquatic animal, usually fish. However, since the applicability of single-species biomonitoring information may be subject to question when viewed in light of community toxicity and ecological quality control programs, we developed a computer-assisted multiple species biosensing system for stream-side water quality monitoring. In addition to using bluegill, emphasis was placed on refining techniques for detecting species-specific bioelectric responses produced by unrestrainted mussels, burrowing mayfly nymph (Hexagenia spp.) and preliminary work with caddis fly larva case builders. A specially designed differential amplifier was used for measuring bioelectric responses induced from specific movement activities generated by each test subject. Selected responses were detected as discrete analog signals, digitized and filed on disk. A management program provided various means for data gathering, filing and retrieval. Two pilot biomonitors were developed, each consisting of a 16-bit instrumentation minicomputer with hardcopy and modum outputs. These systems coupled to an IBM-PC based biomonitor having multichannel biosensor and physical parameter inputs, complete the present network.

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