Hexafluorosilicic acid showed a 96 h-LC50 on Lepomis macrochirus of 50 mg/l.
Other data are available for various fluoride salts and are summarised below:
LC50 values of 107.5, 92.4, 118.5, 105.1, 64.1 ppm at 96, 120, 144, 168 and 192 h respectively are reported for rainbow trout (Camargo & Tarazona, 1991). The same authors report LC50 value for brown trout of 164.5, 135.6, 118.5, 105.1 and 97.5 ppm after 96, 120, 144, 168 and 192 h respectively. The EU RAR for hydrogen fluoride reports additional LC50 values of 299 mg/L (48h in Leuciscus idus); 51 mg/L in (96h in Onchorynkus mykiss) and 340 mg/L (96h in Gasterosteus aculeatus). The RIVM Integrated Criteria Document reports additional data, with LC50 values ranging from 128 -460 mg/L (Sloof et al,1988). The RIVM document also reports LC50 values of >100 mg/L (the limit of solubility) for sodium fluoride in seawater.