To prove the merits of the degree of water quality and ecology and to experience with the human body, can be regarded as a biological monitoring, but there is no need to put their lives testing the waters ", the state through the observation of a variety of biological survival of the water, you can getmore long-term and comprehensive test results, long-term life of aquatic organisms in the water, the water quality of the environment change will affect their shape, survival, quantity, and so on. Due to the economic development of the local river ecosystem destruction, so that many aquatic plants and animals in the river to the gradual extinction of some endemic valuable aquatic disappeared, based on historical data records, after a number of various biological and population and find the reasons for their disappearance, to discover the source of pollution, identify countermeasures. Such as: fish in the nearby river, the water dissolved oxygen, heavy metals sensitive to the water quality will affect the physiological indicators, growth indicators and mortality can be achieved through the measurement of the status of the signs, the monitoring of water quality the role of Another example is the salmon as remediation Rhine indicator organism, can be used to test the effect of overall recovery of the river ecosystem, the process of governance in the Rhine in Germany, the goal of governance is "Let the salmon return to the Rhine. British governance River Thames, has spent nearly 100 years until the late 1970s, after the renovation of the River Thames to rediscover the basin on behalf of fish - salmon.
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