Qilu Lake is a eutrophic lake, and the water pollution is mainly organic pollution and nitrogen and phosphorus pollution. The annual average water temperature is 65438 05.6℃; The original fish fauna is relatively simple, consisting of 65,438+00 indigenous fish species, such as terrestrial carp, big head carp, Yunnan carp, bridge-billed carp, crucian carp, loach, eel, catfish and mullet. 1964 1 year ago, it mainly proliferated naturally, and then it began to be artificially stocked. The fish released artificially are carp, white crucian carp, herring, grass carp, silver carp, bighead carp, carp, wheat ear fish and puffer fish. At present, there are 4 families 18 species of fish, and the output of indigenous economic fish has been greatly reduced. Big head carp and silver carp are almost extinct, and rare economic fish such as herring, worship carp, pouting carp, Yunnan carp and white fish are on the verge of extinction. Pollution-tolerant crucian carp varieties and imported crucian carp varieties are self-endangered.
The lake is rich in rice, wheat, tobacco and other crops.