Freshwater Fish Juvenile Growth Test (OECD 215)
28 Day - Juvenile Fish Growth Test (Oncorhynchus mykiss)
This study is designed to assess the effects of prolonged exposure to chemicals on the growth of juvenile fish.
Juvenile fish in exponential growth phase are weighed, then placed in test chambers and are normally exposed to five sublethal concentrations of the test substance dissolved in water preferably under flowthrough, or, if not possible, under appropriate semi static (static-renewal) conditions. The test duration is 28 days. The daily food ration is based on initial fish weights and may be recalculated after 14 days.
Measurement of the concentration of the test substance should be included in the report, along with the observation of external abnormalities and abnormal behavior and the fish weighting at the end of the test. Effects on growth rates are analyzed using a regression model in order to estimate the concentration that would cause a x % variation in growth rate, i.e. ECx. Alternatively, the data may be compared with control values in order to determine the lowest observed effect concentration (LOEC) and the no observed effect concentration (NOEC).