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flag A yearlong DNA study found 103 fish species in Tianjin’s Haihe River, with silver carp dominating, revealing seasonal biodiversity shifts.

flag A yearlong fish census of the Haihe River using environmental DNA technology identified 103 fish species across 17 orders, revealing a diverse aquatic ecosystem dominated by cyprinids, especially silver carp, which made up nearly 90% of the population in winter. flag Conducted by Tianjin Normal University across 12 sampling points, the study found peak biodiversity in autumn with 75 species, and lowest numbers in spring, linked to seasonal reproduction cycles. flag The non-invasive method, which analyzes DNA from water samples, provides accurate data without harming fish, supporting conservation and river management efforts.

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