Effect of Fluoxetine Hydrochloride on Routine Metabolism of Lambari (Deuterodon iguape, Eigenmann, 1907) and Phantom Shrimp (Palaemon pandaliformis, Stimpson, 1871)

Abstract

Fluoxetine is an emerging pollutant that acts as a selective serotonin reuptake inhibitor (SSRI) and being a hydrolytic molecule that is photolytically stable and accumulaties in biological tissues, its disposal in the aquatic environment can interfere with the physiology of fish and shrimp. Thus, the objective of this study was to analyze the effects of fluoxetine on routine metabolism (metabolic rate, specific ammonia excretion and O:N ratio) of Deuterodon iguape and Palaemon pandaliformis. For this, five groups of each species, were exposed to different concentrations of fluoxetine for 24 hours (D. iguape) and 2 hours (P. pandaliformis). The results demonstrated that in D. iguape exposure to fluoxetine significantly increased both the metabolic rate by 75%, 85%, 55% and 50% for concentrations of 0.05; 0.1; 0.5 and 1.0 mgL -1 , respectively, and the specific ammonia excretion by 40%, 48% and 20% for concentrations of 0.05; 0.1 and 0.5 mgL -1 , respectively, when compared with their control. The O:N ratio was statistically greater in concentrations of 0.5 and 1.0 mgL -1 . Concerning P. pandaliformis, exposure to fluoxetine increased metabolic rate at concentrations 30.0 and HIGHLIGHTS  Fluoxetine increases the metabolic rate and excretion of ammonia in both species. O:N ratio in fish showed higher values in the highest concentrations of fluoxetine.  The LC50 -96 hour values of Palaemon pandaliformis represented greater toxicity.  Both species are a good biological model for fluoxetine exposure studies. Rezende, K.F.O.; et al.

Ecotoxicological assessment of the effects of fluoxetine on Daphnia magna based on acute toxicity, multigenerational reproduction effects, and attraction-repellence responses

“…The LC 50 value reported for fluoxetine concerning Pseudokirchneriella subcapitata (microalgae) was 24 μg/L (Brooks et al, 2003). A recent study by Rezende et al (2021) showed LC 50 values of fluoxetine after 24, 48, 72 and 96 h of 40, 36, 28 and 26 μg/L, respectively, for Palaemon pandaliformis (phantom shrimp). This shows that other organisms are clearly more sensitive to fluoxetine than D. magna.…”