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Toxicological, biochemical and morphophysiological effects of Serjania erecta leaf aqueous extract on Piaractus mesopotamicus

2021; Brazilian Academy of Sciences; Volume: 93; Issue: 4 Linguagem: Inglês

10.1590/0001-3765202120190479

1678-2690

Arlene Sobrinho Ventura, Ruy Alberto Caetano Côrrea Filho, Louise Nex Spica, ANA CREMILDA F. SILVA, Andréa Maria de Araújo Gabriel, Cláudia Andréa Lima Cardoso, Gabriela Tomas Jerônimo, Jayme Aparecido Povh,

Aquaculture disease management and microbiota

This study was carried out to determine the toxicity and biochemical and morphophysiological changes caused by Serjania erecta leaf aqueous extract in pacu (Piaractus mesopotamicus). For acute toxicity testing (CL50-4h), pacu juveniles were exposed during 4 h to Serjania erecta aqueous extract concentrations of 2.5, 12.5, 25, 50, 100, and 150 µg mL-1, which were added directly to the water in the tanks. In the control group, the animals were kept in water free from aqueous extract. CL50-4 h was estimated at 57.43 µg mL-1. After exposure to the aqueous extract, the highest (P<0.05) glucose concentration and the lowest (P<0.05) plasma sodium level were when the fish were exposed to the S. erecta concentration of 50 µg mL-1. Mortality occurred at S. erecta extract levels higher than 50 μg mL-1, and all fish died at concentrations greater than 100 μg mL-1. In addition, exposure to this extract caused severe histological changes in the gills and liver with higher prevalence of necrosis (30.2%), and fatty degeneration (77.4%) respectively. At the concentrations tested here, S. erecta aqueous extract causes morphofunctional alterations in this fish species.