Environmental Effects on Toxicity of Heavy Metals to Two Species of Tropical Marine Fish from Northern Australia
Titel:
Environmental Effects on Toxicity of Heavy Metals to Two Species of Tropical Marine Fish from Northern Australia
Auteur:
Denton, G. R. W. Burdon-jones, C.
Verschenen in:
Chemistry & ecology
Paginering:
Jaargang 2 (1986) nr. 3 pagina's 233-249
Jaar:
1986-05-01
Inhoud:
The acute toxicities of mercury, copper, cadmium, zinc, nickel, and lead to adult and juvenile glass perch (Priopidichthys marianus) and juvenile diamond-scaled mullet (Liza vaigiensis) were examined. Tests with adult glass perch were carried out at 20°C and 36‰ salinity whilst those with juveniles were undertaken at all combinations of 30 and 20°C and 36 and 20‰ salinity. Tests with juvenile mullet were conducted at 20°C at both high and low salinity. All tests ran for 96 hours. The general rank order of metal toxicity to juvenile glass perch was Hg>Cu>Cd=Zn>Ni>Pb. Zinc appeared to be more toxic than cadmium to adult glass perch whilst for juvenile mullet the order was reversed. Both adult and juvenile glass perch exhibited similar tolerances towards mercury, copper and lead although juveniles seemed marginally more sensitive to zinc and considerably more sensitive to cadmium and nickel. Juvenile mullet were more susceptible to cadmium than juvenile glass perch tested under similar conditions, and were somewhat less tolerant of mercury and copper when held in low salinity seawater. Changes in the experimental temperature did not affect the toxicity of any metal tested whereas changes in salinity frequently did. Some preliminary observations relating to general and metal specific symptoms of intoxication are described. The toxicity data are discussed with respect to the metal tolerances of other marine fish species reported in the literature, and also with regards to existing water quality criteria.
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