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Ecology --- -Ecology --- -Balance of nature --- Biology --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Environmental sciences --- Population biology --- Congresses --- Philosophy --- -Congresses --- Balance of nature --- Philosophy&delete&

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This detailed background review paper provides a summary of the relevant literature (up to September 2001) relevant to the standardisation and validation of the rodent uterotrophic bioassay. The rodent uterotrophic bioassay is being validated as part of the OECD Test Guidelines Programme.  The rodent uterotrophic bioassay is based on the principle that the uterus is under the control of oestrogens to stimulate and maintain growth. If endogenous sources of this hormone are not available, the animal will require an exogenous source to initiate and/or restore uterine growth.  

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This Test Guideline is designed to assess the effects of prolonged exposure to chemicals on the growth of juvenile fish. Juvenile fish in exponential growth phase are placed, after being weighed, 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. The study report should include the concentration measurement of the test substance, 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).

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General ecology and biosociology --- Ecology --- -Balance of nature --- Biology --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Environmental sciences --- Population biology --- Philosophy --- Philosophy. --- -Philosophy --- Ecophilosophy

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General ecology and biosociology --- Ecology --- Tropical climate --- Tropical climate. --- Balance of nature --- Biology --- Bionomics --- Ecological processes --- Ecological science --- Ecological sciences --- Environment --- Environmental biology --- Oecology --- Environmental sciences --- Population biology