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Ecotoxicological information

Long-term toxicity to fish

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Link to relevant study record(s)

Description of key information

NH4
The toxicity study in seven species show that the ammonia toxicity is amore than 25 times lower (for sensitvest species: 1.3 mg NH4 /L) as the Zn toxicity
Zn:
freshwater:
Data on 7 species available. Species NOECs range between 0.044 and 0.530 mg Zn/l (dissolved concentrations)
Marine:
Data on 1 species available. NOEC = 0.025 mg Zn/l (dissolved concentrations)
Species NOECs have been put into the respective species sensitivity distributions.
Zn is responsible for aqutic toxicity

Key value for chemical safety assessment

Additional information

NH4

Dwyer shows in a seven species study, that the toxicity for the sensitivest species (1.3 mg NH4 /l) is. So the toxicity of ammonium ist motre than 25 times lower as the toxicity of zinc.

Zn

Extensive high quality chronic data were available on 7 (freshwater) and 1 (marine) fish species. These data were all screened for relevancy to the environment under study.

The freshwater species are part of 4 families: Cyprinodontidae (Jordanella), Cyprinidae (Phoxinus, Pimephales), Salmonidae (Oncorrhynchus, Salvelinus, Salmo trutta) and Cottidae (Cottus). The sensitivity of these species is equally distributed over the species sensitivity distribution. The fish species NOECs are combined with the other freshwater chronic data in the SSD to give the HC5 from which the PNEC is derived.

The saltwater species comes from the family Clupeidae (Clupea harengus). This species is not among the most sensitive ones in the species sensitivity distribution. The fish species NOEC is combined with the other marine chronic data in the SSD to give the HC5 from which the PNEC saltwater is derived.