EnviroGulf Consulting

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ABN 62 713 622 437

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Aquatic Toxicity and Ecotoxicological Impact Assessment

EnviroGulf Consulting assesses contaminant risk to ecological resources using an ecotoxicological and extrapolation approach based on: reviews and evaluations of contaminant data to identify the nature of the hazard; reviews of toxicity data in the literature; identification of the conditions of exposure (e.g., intensity, frequency, and duration of exposure) based on either monitoring data or predicted by modelling; and a combination of the information on toxicity and exposure data to estimate the probability that receiving water organisms may be adversely affected by the contaminant(s) or wastewater discharge being examined.

The Principal of EnviroGulf Consulting has an in-depth understanding of the principles involved in assessing the fate, behaviour and effects of contaminants in aquatic ecosystems. This expertise allows the ability to anticipate, document and predict biological and toxicity effects.

Consulting Services

The main services available are as follows:

Toxicity Bioassays and Tests

EnviroGulf Consulting subcontracts analytical and toxicological laboratories to conduct the following tests under supervision, as well as taking concurrent test media samples for chemical analysis.

EnviroGulf Consulting subcontractors can provide a broad range of toxicity tests with freshwater, marine and estuarine organisms. These tests conform with requirements of the ANZECC/ARMCANZ Water and Sediment Quality Guidelines and the National Ocean Disposal Guidelines for dredged Material issued by Environment Australia (2002). Some of the tests offered below follow the Organisation for Economic Co-operation and Development (OECD) guidelines for toxicity effects on aquatic organisms.

Freshwater tests:

The following are example toxicity tests using freshwater orgainsms.


Estuarine and Marine Water Tests:

The following are example toxicity tests using freshwater orgainsms.


Field In situ Tests:

The above toxicity tests are conducted according to standardised procedures developed overseas and approved by local regulatory authorities. Where effluents have degradable toxicants, continuous flow-through or semi-static (solution renewal) tests may be substituted.

Chronic Toxicity Testing

Dilution and dispersion of effluent toxicants in receiving waters results in low concentrations of toxicants and chronic exposure conditions. EnviroGulf Consulting does not recommend clients to conduct chronic toxicity testing, unless specifically required by regulatory authorities. Retrospective biological monitoring of receiving waters is recommended for investigating sublethal effects and ecosystem response in receiving waters. In this manner toxicant acclimatisation and behavioural avoidance are taken into account, and corrective actions may be taken if unforeseen subtle sublethal effects are manifested in the receiving environment.

Predictive Toxicity

The normal approach to predicting the effects of toxic wastewater discharges is an examination of the concentrations and mass-flows of toxicants in the receiving waters in relation to the known quality characteristics of an effluent discharge. EnviroGulf Consulting uses a complementary approach using a predictive toxicity index based on a toxic units model which uses the LC50 values of commonly occurring pollutants in receiving waters.

EnviroGulf Consulting also operates a computerised version of the toxic units model for predicting the toxicity of complex effluents containing dissolved metal contaminants, cyanides and, or, phenols and offers this service to clients as part of an overall ecotoxicological assessment.



Research Fellow, Applied Hydrobiology Research Station, Uttoxeter, England:

Ecotoxicological studies and impact assessment:

Technical Reports / Publications:

Other experience:




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