Antiparasitic effects of peracetic acid on Striped Bass infested with Trichodina spp.

Abstract

The antiparasitic effect of peracetic acid (PAA) was evaluated against an infestation of the protozoan Trichodina spp. in naturally infected juvenile domestic seventh generation (F7) Striped Bass, Morone saxatilis. Replicated treatments (n=3) consisted of 1 and 2 mg/L PAA and a control; treatments were applied every other day for 3 treatments (30 min static exposure). Infestation intensity was enumerated 20 ‐ 24 h after each treatment by counting the number of Trichodina present in a wet mount of excised gill tissue. Neither treatment rate was able to completely eradicate the parasite, however 2 mg/L PAA resulted in a statistically significant reduction which equated to 75% reduction of observed parasites. The 2 mg/L PAA treatment regimen in the present study is proposed as a safe, environmentally friendly, and effective method for reducing the intensity of Trichodina infestations in Striped Bass.