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Short-term toxicity to fish

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Reference
Endpoint:
short-term toxicity to fish
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Estimated data from EPISUITE
Qualifier:
according to guideline
Guideline:
other: Modeling database
Principles of method if other than guideline:
Short term toxicity of test chemical were estimated on the mortality of fish.
GLP compliance:
no
Analytical monitoring:
no
Vehicle:
no
Test organisms (species):
other: Fish
Test type:
static
Water media type:
freshwater
Total exposure duration:
96 h
Reference substance (positive control):
no
Key result
Duration:
96 h
Dose descriptor:
LC50
Effect conc.:
18.916 mg/L
Nominal / measured:
estimated
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Remarks on result:
other: Neutral Organic SAR:(Baseline Toxicity)
Validity criteria fulfilled:
no
Conclusions:
The predicted data from ECOSAR v1.1 model suggests the lethal concentration (LC50) for test chemical was estimated to be 18.916 mg/l on the basis of mortality effects with duration 96 hrs.
Executive summary:

Acute fish toxicity study of 96 hrs. (EPI suite, ECOSAR version 1.1, 2016) were conducted to assess toxic effects of test chemical and the results were predicted. The study was based on the effects of the test compound on fish in a static fresh water system. The lethal concentration (LC50) for test chemical was predicted to be 18.916 mg/l on the basis of mortality effects.

Thus, based on lethal concentration, it can be concluded that test chemical considered as toxic to fish and thus can be classified as aquatic chronic category 3. Since the chemical is readily biodegradable in nature thus it is considered as non-toxic to fish and thus cannot be classified as hazardous as per the CLP criteria.

Description of key information

In the acute fish toxicity study of 96 hrs. (EPI suite, ECOSAR version 1.1, 2016) were conducted to assess toxic effects of test chemical and the results were predicted. The study was based on the effects of the test compound on fish in a static fresh water system. The lethal concentration (LC50) for test chemical was predicted to be 18.916 mg/l on the basis of mortality effects. Thus, based on lethal concentration, it can be concluded that test chemical considered as toxic to fish and thus can be classified as aquatic chronic category 3. Since the chemical is readily biodegradable in nature thus it is considered as non-toxic to fish and thus cannot be classified as hazardous as per the CLP criteria.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
18.916 mg/L

Additional information

Various experimental and predicted data available for the test chemical and structurally and functionally similar read across chemicals were reviewed to determine the toxic nature of test chemical on the mortality of fish. The studies are as mentioned below:

 

In the first acute fish toxicity study of 96 hrs. (EPI suite, ECOSAR version 1.1, 2016) were conducted to assess toxic effects of test chemical and the results were predicted. The study was based on the effects of the test compound on fish in a static fresh water system. The lethal concentration (LC50) for test chemical was predicted to be 18.916 mg/l on the basis of mortality effects. Thus, based on lethal concentration, it can be concluded that test chemical considered as toxic to fish and thus can be classified as aquatic chronic category 3. Since the chemical is readily biodegradable in nature thus it is considered as non-toxic to fish and thus cannot be classified as hazardous as per the CLP criteria.

 

Prediction done using average value of both models i.e Leadscope and SciMatics SciQSAR model and the result were predicted in Battery model. Based on the Danish (Q)SAR Database, the 96 hours LC50 was estimated to be 5.62 mg/l on Pimephales promelas for substance with mortality effects. Thus based on this value it can be concluded that the substance can be classified as toxic. But as the chemical was readily biodegradable in water thus chemical consider to be nontoxic to fish and not classified as per the CLP classification criteria.

 

Similarly above data was supported by the experimental data from report. This study was designed to access the toxic effects of the test compound on the Zebra fish (Danio rerio). Bowl aquaria containing 4 liters of potable water (passed through reverse osmosis system) were loaded with 8 fishes each. A static procedure was used for the study and it was conducted in compliance with the OECD guideline 203.The nominal concentration selected for the experiment were and test fish were exposed to 6.25 mg/L, 12.5 mg/L, 25 mg/L, 50 mg/L & 100 mg/L concentrations for 96 hours. The test substance was moderately soluble in water. Initially, stock solution was prepared by dissolving 1ml of the test substance in 1 liter of potable water (passed through reverse osmosis system) with 24 hrs of continuous stirring. From this stock solution, further test concentration was prepared for achieving test concentrations of 6.25 mg/L, 12.5 mg/L, 25 mg/L, 50 mg/L & 100 mg/L, respectively.  The median lethal concentration (LC50) for test chemical on Danio rerio in a 96 hours study on the basis of mortality effect was determine to be >12.5 mg/L. Thus, on the basis of this LC50 value and according to CLP criteria for aquatic classification of the substance, it is concluded that the substance, is classified under aquatic chronic 3 category and exhibits short term toxicity to fish. But as the chemical was readily biodegradable in water, thus on that basis, chemical consider to be nontoxic and not classified as per the CLP classification criteria.

 

In experimental study from peer reviewed journal short term toxicity study to Cyprinus carpio was carried out for 44 hrs. Test was performed under flow through conditions. After exposure of test animal to different dose conc. i.e, at 68, 130 and 146 mg/l of test chemical. Glass-fronted, fiberglass tanks were used in the study, no effects were observed on the test animal. Thus, the NOEC value was consider to be 146 mg/l respectively.

Thus based on the all above data and results, chemical consider to be nontoxic and not classified as per the CLP classification criteria.

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