Responses of seven fish species to 2,4,5-T



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Texas Tech University


Seven fish species raised in aquaria received repeated exposures of two 2,4,5-T formulations in parts per billion (ppb) concentrations. Largemouth bass {Micropterus salmoides), white crappie [Pomoxis annularis), black bullhead catfish [lotalurus melas), channel catfish (j. punctatus), and a green-redear sunfish hybrid (Leponrls oyanellus x L. microlophus) were exposed to the triethyl amine 2,4,5-T formulation. Two other species, sharpnose shiners {Notropis oxyrhynchus) and red shiners {N. lutvensis) were exposed to the isooctyl ester 2,4,5-T formulation. Treatment levels ranged from 25 to 400 ppb, the number of exposures varied from 2-9, and time between exposures was from 2 to 5 weeks. Duration of the experiments was from 9 to 18 weeks. The treatments were not responsible for mortalities or differences in growth. Some accumulation of 2,4,5-T residues in tissues at ppb levels did occur in most of the fish species tested. No dioxin residues were found in any fish tissues. The "no effect" results suggest that 2,4,5-T residues which might enter an aquatic system following its use on land would not present any serious hazard to fish populations.



Herbicides -- Toxicology, Trichlorophenoxyacetic acid, Fishes