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Short-term toxicity to fish

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Reference
Endpoint:
short-term toxicity to fish
Type of information:
experimental study
Adequacy of study:
key study
Study period:
The study was conducted between 05 June 2016 and 08 July 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 203 (Fish, Acute Toxicity Test)
Version / remarks:
1992
Deviations:
no
Qualifier:
according to
Guideline:
EU Method C.1 (Acute Toxicity for Fish)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Sponror Lot/Batch number: 5399661C10
- Expiration date of the lot/batch: 24 February 2020
- Purity test date:

RADIOLABELLING INFORMATION (if applicable)
- Radiochemical purity:
- Specific activity:
- Locations of the label:
- Expiration date of radiochemical substance:

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature in the dark
- Stability under test conditions:
- Solubility and stability of the test substance in the solvent/vehicle:
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium:

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing:
- Preliminary purification step (if any):
- Final dilution of a dissolved solid, stock liquid or gel:
- Final preparation of a solid:

FORM AS APPLIED IN THE TEST (if different from that of starting material)

OTHER SPECIFICS:
Analytical monitoring:
yes
Remarks:
Water Accomadated Fraction (WAF) was determined
Details on sampling:
- Concentrations: Nominal loading rates of 1, 10 and 100 mg/L for range-finding test and 100 mg/L for definitive test
- Sampling method:
- Sample storage conditions before analysis: Frozen
Vehicle:
no
Details on test solutions:
The loading rate to be used in the definitive test was determined by a preliminary range-finding test.
In the range-finding test, fish were exposed to a series of nominal loading rates of 1.0, 10 and 100 mg/L.
Nominal amounts of test item (23, 220 and 2200 mg) were each separately added to the surface of 22 liters of test water to give the 1.0, 10 and 100 mg/L loading rates, respectively. After the addition of the test item, the test water was stirred by magnetic stirrer using a stirring rate such that a vortex was formed to give a dimple at the water surface. The stirring was stopped after 23 hours and the mixtures allowed to stand for 1 hour. A wide bore glass tube, covered at one end with Nescofilm was submerged into the vessel, sealed end down, to a depth of approximately 5 cm from the bottom of the vessel. A length of Tygon tubing was inserted into the glass tube and pushed through the Nescofilm seal. Microscopic inspection of the WAFs showed no micro-dispersions or undissolved test item to be present. The aqueous phase of the WAF was removed by mid-depth siphoning (the first 75-100 mL discarded) to give the 1.0, 10 and 100 mg/L loading rate WAFs.
Test organisms (species):
Oncorhynchus mykiss (previous name: Salmo gairdneri)
Details on test organisms:
TEST ORGANISM
- Common name: Rainbow trout
- Strain:
- Source:Brow Well Fisheries Limited, Hebden, near Skipton, Yorkshire, UK
- Age at study initiation (mean and range, SD): juvenile


ACCLIMATION
- Acclimation period: 7 days
- Acclimation conditions (same as test or not): as test
- Type and amount of food during acclimation: commercial trout pellets
- Feeding frequency during acclimation: daily
- Health during acclimation (any mortality observed): good

QUARANTINE (wild caught)
- Duration:
- Health/mortality:

FEEDING DURING TEST
- Food type:
- Amount:
- Frequency:
Test type:
semi-static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h
Hardness:
140 mg/L as Ca Co3
Test temperature:
14 - 15 ”C
Dissolved oxygen:
8.7 mg O2/L
Details on test conditions:
TEST SYSTEM
- Test vessel: glass fibre tank
- Type (delete if not applicable):closed
- Material, size, headspace, fill volume: 20L
- Aeration: via narrow bore glass tube
- Type of flow-through (e.g. peristaltic or proportional diluter):
- Renewal rate of test solution (frequency/flow rate):
- No. of organisms per vessel: 7
- No. of vessels per concentration (replicates): 1 for definitive test
- No. of vessels per control (replicates): 1
- No. of vessels per vehicle control (replicates): 1
- Biomass loading rate:

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water:
- Total organic carbon:
- Particulate matter:
- Metals:
- Pesticides:
- Chlorine:
- Alkalinity:
- Ca/mg ratio:
- Culture medium different from test medium:
- Intervals of water quality measurement:

OTHER TEST CONDITIONS
- Adjustment of pH:
- Photoperiod: 16h light : 8 h dark
- Light intensity:

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :

TEST CONCENTRATIONS
- Spacing factor for test concentrations:
- Justification for using less concentrations than requested by guideline:
- Range finding study
- Test concentrations: 1, 10 and 100 mg/L
- Results used to determine the conditions for the definitive study: yes 100 mg/L
Reference substance (positive control):
no
Key result
Duration:
96 h
Dose descriptor:
LL50
Effect conc.:
> 100 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality
Details on results:
Analysis of the test preparations at 0 and 72 hours (fresh media) showed measured test concentrations to be 0.036 and 0.010 mg/L, respectively. A decline in measured test concentrations was observed in the old media samples at 24 and 96 hours to 0.016 and 0.0082 mg/L, respectively (equivalent to 44% and 82% of the corresponding fresh media concentrations).
Given that the toxicity cannot be attributed to a single component or a mixture of components, but to the test item as a whole, the results were based on nominal loading rates only.
Exposure of rainbow trout to the test item gave LL50 values of greater than 100 mg/L loading rate WAF. The No Observed Effect Loading Rate was 100 mg/L loading rate WAF.
It was considered unnecessary and unrealistic to test at loading rates in excess of 100 mg/L loading rate WAF
Validity criteria fulfilled:
yes
Conclusions:
The acute toxicity of the test item to the freshwater fish rainbow trout (Oncorhynchus mykiss) has been investigated and gave a 96-Hour LL50 value of greater than 100 mg/L loading rate WAF. The No Observed Effect Loading rate was 100 mg/L loading rate WAF.
Executive summary:

Due to the low aqueous solubility and complex nature of the test item, for the purposes of the test, the test medium was prepared as a Water Accommodated Fraction (WAF). Following a preliminary range-finding test, seven fish were exposed to a Water Accommodated Fraction (WAF) of the test item, at a single nominal loading rate of 100 mg/L for a period of 96 hours at a temperature of 14 °C to 15 ºC under semi-static test conditions. The number of mortalities and any sub-lethal effects of exposure in each test and control vessel were determined 1, 3 and 6 hours after the start of exposure and then daily throughout the test until termination after 96 hours.

Analysis of the test preparations at 0 and 72 hours (fresh media) showed measured test concentrations to be 0.036 and 0.010 mg/L, respectively. A decline in measured test concentrations was observed in the old media samples at 24 and 96 hours to 0.016 and 0.0082 mg/L, respectively (equivalent to 44% and 82% of the corresponding fresh media concentrations). Given that the toxicity cannot be attributed to a single component or a mixture of components, but to the test item as a whole, the results were based on nominal loading rates only. Exposure of rainbow trout to the test item gave LL50 values of greater than 100 mg/L loading rate WAF. The No Observed Effect Loading Rate was 100 mg/L loading rate WAF. It was considered unnecessary and unrealistic to test at loading rates in excess of 100 mg/L loading rate WAF

Description of key information

The acute toxicity of the test item to the freshwater fish rainbow trout (Oncorhynchus mykiss) has been investigated and gave a 96-Hour LL50 value of greater than 100 mg/L loading rate WAF. The No Observed Effect Loading rate was 100 mg/L loading rate WAF.

Key value for chemical safety assessment

LC50 for freshwater fish:
100 mg/L

Additional information