Short-term toxicity of ammonia, sodium Hydroxide and a commercial biocide to golden mussel Limnoperna fortunei (Dunker, 1857)

摘要

Macrofouling bivalves are considered an ecological and technological problem worldwide. Control measures have been researched with Limnoperna fortunei, but without success. The aim of the manuscript is to test some alternatives to regulate this harmful invasive mollusk. Mortality and behavioral response (shell gaping) of Limnoperna fortunei exposed to three chemical compounds were evaluated. Values for LC_(50) 96 h were: 0.25 (0.24-0.27) mg/L NH_3-N, 11.10 (7.45-16.55) mg/L MXD-100 and 88.51 (74.61-105.01) mg/L NaOH. Reduced gaping was observed beginning at concentrations of 0.31 mg/ L (NH_3-N), 100 mg/L (MXD-100) and 160 mg/L (NaOH) and increased above these values. The percentage of individuals gaping after two hours at LC_(50) 96 h differed significantly (χ~2 = 79.9; DF=3; p < 0.001) in MXD-100 (50%), NaOH (0%), NH_3-N (96.7%) and the controls (93.3%). This study contributes to the understanding of the relationship between toxicity and behavioral effects of some toxicants in L. fortunei.