Fish habitat suitability comprehensive evaluation method based on Vauge set similarity theory

The invention provides a fish habitat suitability comprehensive evaluation method based on a Vauge set similarity theory, and the method comprises the steps: (1) determining a key evaluation period based on the ecological protection demands of a river and in combination with the survival and reproduction characteristics of target fishes; (2) constructing a habitat suitability evaluation index system in a differentiated manner according to habitat element requirements of target fishes in the key evaluation period; (3) constructing a Vauge set membership function of each characteristic index in different evaluation periods based on fuzziness of target fishes for habitat element requirements; and (4) judging the habitat comprehensive suitability of the to-be-evaluated region in different life stages, and identifying regions with insufficient suitability and restrictive habitat elements. According to the method, a habitat similarity measurement model based on a vague set is introduced, each index in a habitat sui