| ecotoxicological assessment of effluents in the basque country (northern spain) by acute and chronic toxicity tests using daphnia magna straus. | acute pass/fail, multi-concentration tests, and 3-brood chronic toxicity tests with daphnia magna straus (cladocera, crustacea) were used to characterise industrial and municipal effluents from various sources. the effluents that "passed" the pass/fail tests had 48-h ec50 values >100% and reproduction no observed effect concentration (noecs) > or =100%, except for one effluent that had a reproduction noec of 31.6%. the acute multi-concentration toxicity tests allowed a rapid classification of ef ... | 2006 | 17021961 |