Perhaps, there are no "universal" representatives? If you first match contaminants in question and relevant environments, then it would be easier to select representative test species in these environments...
I hope your answer will be helpful for me. Can I use zebrafish, Daphnia Magna, vibrio fscheri, green algae are representative of the different trophic level of food. As my studies will be limited towards aquatic species.
The species that you suggest (zebrafish, Daphnia magna, Vibrio fischeri, green algae) seem like a good start for an assessment of effects in aquatic systems. Of course, zebrafish and Daphia are freshwater species, and Vibrio fischeri is marine, so you might need to think about whether you are focussing on fresh or marine environments. (Green algae could be either fresh or marine depending on species).
For more detailed information, have a look at papers by Michael Warne:
Revised Method for Deriving Australian and New Zealand Water Quality Guideline Values for Toxicants (https://publications.csiro.au/rpr/download?pid=csiro:EP159161&dsid=DS4) (Section 3.4.5 discusses minimum data requirements for deriving Australian Water Quality Guidelines)
or for a briefer introduction: Changes to the Method for Deriving Australian and New Zealand Water Quality Guideline Values for Toxicants (https://www.epa.gov/sites/production/files/2016-01/documents/02_warne_usepa_aus_nz_wqg_for_usepa_web-site_secure_1.pdf)
If you can use species that are likely to be present in the region where discharges of your chemicals will occur, it will increase the relevance of your assessment.
You may remember that I sent you copies of some other papers last year; some of those may be relevant, too. The link above to the Warne - revised method... paper has been updated this year so use it instead of the version I sent you.
All the best. Let me know if you need anything made clearer.