Daphnia immobilisation test: negative controls are fine after 24h, but 100% immobilised after 48h?

I am currently doing the daphnia acute immobilisation test and am trying to find out why our negative controls are fine after 24 h, but immobilised after 48 h. O2 levels and pH do not seem to be...

17 April 2018 2,817 5 View