Evaluation of Health Status of Mudanjiang River and Its Tributaries based on Fish Integrity Index
In May and October 2021,the surveys were conducted on the fish in the Mudanjiang River and its tributaries,using fish as indicator species.The study aimed to evaluate the health status of the Mudanjiang River and its tributaries.The fish integrity index was established by selecting the proportion of mid-lower layer fish species(indicator M10),the proportion of herbivorous fish species(indicator M13),and the proportion of sensitive fish species(indicator M20).The research revealed that during the survey periods,there were 49 fish species belonging to 37 genera,13 families,and 7 orders in the Mudanjiang River and its tributaries.Among them,15 species,including Carassius auratus gibelio,Pseudorasbora parva,Silurus asotus,and so on were identified as dominant species.Certain river segments of the Mudanjiang River were found to be in good health,such as the upper reaches of the main stream(Langang town segment)and most segments south of Ningjiang City(Tuchengzi township segment,Dagushan segment,Laogulazi segment,and Linjiang village segment).However,most segments in the upper reaches(Yilan town segment,Sandaotong town segment)and the tributary,Hathe River,were in suboptimal health.The middle reaches of the Mudanjiang River main stream(Sandaohezi town segment,Erdaohezi town segment,Tieling town segment)and the tributary,Hailang River,were in fair health,while the health status of the tributaries,Tieling River,Shuang River,and Bei'an River,was poor.It is recommended to strictly control pollution sources affecting the Mudanjiang River and its tributaries,to enhance supervision of domestic and industrial wastewater discharge,and to promote the restoration of the water environment.Additionally,the development and utilization of water resources in segments where fish spawn should be prohibited.Adopting a harmonious tourism development model that minimizes pollution and damage to the water environment is crucial for maintaining the balance between human activities and nature in the Mudanjiang River and its tributaries.
fishindex of biotic integrityriverhealth conditionevaluationMudanjiang River
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NSTL
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