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Ecotoxicological information

Long-term toxicity to fish

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Endpoint:
fish, juvenile growth test
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
disregarded due to major methodological deficiencies
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
significant methodological deficiencies
Remarks:
Very non-standard test setup, poor documentation, the study is of low reliability and therefore disregarded.
Justification for type of information:
For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose:
read-across source
Related information:
Composition 1
Principles of method if other than guideline:
Fish were introduced in custom microcosm containers and exposed to the test material for up to 90 days.
GLP compliance:
not specified
Test material information:
Composition 1
Analytical monitoring:
no
Test organisms (species):
other: Oreochromus mossambica
Details on test organisms:
Juvenile fish, 52.4 ± 5.6 mm, 1.55 ± 0.21 g
Test type:
not specified
Water media type:
freshwater
Limit test:
no
Total exposure duration:
90 d
Post exposure observation period:
None
Duration:
90 d
Dose descriptor:
LOEC
Effect conc.:
2.18 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
weight
Validity criteria fulfilled:
no
Conclusions:
Lactic acid LOEC ca. 2.18 mg/L
Executive summary:

The comparative toxicity of lactic acid, acetic acid, and benzoic acid to tilapia (Oreochromis mossambicus), cladoceran crustacean (Moina micrura), and oligochaete worm (Branchiura sowerbyi) were determined using static bioassay tests. Worms were found most sensitive to all the acids whereas the cladoceran was found most resistant to lactic acid and the fish most resistant to acetic acid and benzoic acid. The 96h LC50 values of lactic acid, acetic acid, and benzoic acid, were, respectively, 257.73, 272.87, and 276.74 mg/L for O. mossambicus; 329.12, 163.72, and 71.65 mg/L for M. micrura and 50.82, 14.90, and 39.47 mg/L for B. sowerbyi. Tilapia lost appetite at sub-lethal concentrations as low as 2.18 mg/L lactic acid, 1.26 mg/L acetic acid, and 13.84 mg/L of benzoic acid. Growth and reproduction of the fish were affected following 90-day chronic exposure to sub-lethal concentrations of the acids. Minimum effective concentrations of the acids that significantly reduced food conversion efficiency (FeE), percent increase of weight, specific growth rate, yield and fecundity of the fish were 2.18, 1,47, and 3.95 mg/L of lactic acid, acetic acid, and benzoic acid, respectively. Effects of acetic add and benzoic acid on FCE, weight increase, and yield were not significantly different from each other whereas lactic acid produced different effects from acetic acid as well as benzoic acid. Mean values of dissolved oxygen, primary productivity, and plankton populations of the test medium significantly reduced from control at 16.94 mg/L lactic acid, 16.79 mg/L acetic acid, and 13.84 mg/L benzoic acid.

Endpoint:
fish life cycle toxicity
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
Lactic acid is a ubiquitous and essential molecule of life. As such, testing for chronic toxicity is not warranted. Moreover, since any effects by lactic acid observed in short-term aquatic toxicity tests can be attributed to pH shifts it can be concluded that the substance does not exert significant effects on environmental organisms that result in identification of a hazard. Accordingly, the chemical safety assessment does not indicate the need to further investigate environmental toxicity by means of long-term studies.

Description of key information

The experimentally determined 90-day LOEL for Tilapia is 2.18 mg/L.

However, the study is considered to be unreliable. Overall, a lactate related hazard regarding long-term toxicity to fish is not identified.

Key value for chemical safety assessment

Additional information

Lactic acid is a ubiquitous and essential molecule of life in all vertebrates. It is highly soluble in water, and will not (significantly) accumulate in water. As such, a long-term effect in water for fish is likely to be due to physical effects (pH, electrostatic) at the gill membrane, rather than to systemic toxicity.