2.3. Toxicity experiments
The acute toxicity of oxytetracycline (OTC) and enrofloxacin (ENR), was assessedon five tropical freshwater invertebrate species: a worm (Limnodrilus hoffmeisteri),two molluscs (the snails Physella acuta and Melanoides tuberculata), an insect
(Micronecta sp.), and a crustacean (i.e., the shrimp Macrobrachium lanchesteri)