Acute and subacute toxicity of naphthalene in a filter-feeding species Styela plicata (Chordata, Ascidiacea)

Tahani  EL AYARI; Raja BEN AHMED; Samir GHANNEM; Najoua TRIGUI EL MENIF

doi:10.71754/instm.bulletin.v48.1570

Authors

Tahani EL AYARI University of Carthage. Faculty of Sciences of Bizerte. Laboratory of Environment Bio-monitoring (LBE). Group of Fundamental and Applied Malacology (MAF) https://orcid.org/0000-0003-2631-2099
Raja BEN AHMED University of Tunis El Manar. Faculty of Sciences of Tunis. Department of Biology, Ecology, Biology and physiology of Aquatic Organisms Laboratory (LR18ES41), Tunis, Tunisia https://orcid.org/0000-0002-0880-2855
Samir GHANNEM University of Carthage. Faculty of Sciences of Bizerte. Laboratory of Environment Bio-monitoring (LBE). Group of Fundamental and Applied Malacology (MAF) https://orcid.org/0000-0002-5171-9117
Najoua TRIGUI EL MENIF 1University of Carthage. Faculty of Sciences of Bizerte. Laboratory of Environment Bio-monitoring (LBE). Group of Fundamental and Applied Malacology (MAF), Bizerte, Tunisia https://orcid.org/0000-0002-6083-6630

DOI:

https://doi.org/10.71754/instm.bulletin.v48.1570

Keywords:

Styela plicata, Ascidiacea, acute toxicity, filtration, naphthalene, aromatic hydrocarbon, Ghar El Melh lagoon, Tunisia, Mediterranean

Abstract

The aim of the current study was the assessment of a Polycyclic aromatic hydrocarbon (PAHs) toxicity on an ascidian species, Styela plicata. Acute and subacute toxicity of naphthalene (NAP) has been determined using five increasing concentrations (0.5, 1, 1.5, 2.5 and 5 mg/l) during 96h of exposure. The half lethal concentration (LC50, 96h) value of naphthalene for S. plicata was 2.41 mg/l. Furthermore, the filtration activity decreased in the five tested concentrations of NAP; a significant decrease by 69% and 91.8% was observed after 1h in the groups exposed to C1 and C5, respectively. A similar pattern was noted after 2h of filtration; the decrease was estimated to 39% in C1 and 72.5% in C5. The results from this bioassay confirmed the toxicity of NAP on S. plicata; we also provided information about the use of S. plicata as a potential bioindicator species for the assessment of PAHs toxicity.