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The stability of the ecosystem directly affects the water quality and safety, fishery
production, and people’s quality of life along the route. In this study, extensive
biological information on five dominant species of prey fish, including
Hemiculter leucisculus (Basilewsky, 1855), Acheilognathus macropterus
(Bleeker), Rhodeus sericeus (Pallas,1776), Pseudorasbora parva (Temminck &
Schlegel, 1846), and Squalidus argentatus (Sauvage & Dabry de Thiersant, 1874),
was collected in the lower reaches of the Songhua River, and the population
parameters and variation rules of these fish were evaluated. The results showed
that at present, the fish resources in the lower reaches of the Songhua River were
in an overexploited state. Although the growth rate of prey fish was accelerating,
their growth potential was decreasing. In addition to the homogeneous structure
of the fish community, it was increasingly evident that a high proportion of smallsized fish were present in the fish community. In addition, the growth length
coefficients of the five prey fish species were all greater than 0.2, indicating that
the prey fish were growing at a faster rate, and the range of the growth
performance indicators were 3.49 ~ 4.37. Our data also demonstrated that the
exploitation rates of Hemiculter leucisculus and Squalidus argentatus were both
greater than 0.5, and the exploitation rates of all species were higher than Emax
except for Pseudorasbora parva. Finally, based on the above results, the mesh
size of all nets should be controlled above 45 mm to ensure the size of the main
prey fish populations in the lower reaches of the Songhua River. In summary,
these results provided variation rules and growth of prey fish resources in the
lower reaches of the Songhua River. At the same time, the distribution of major
commercial or endangered baiting grounds in the lower reaches of the Songhua
River was determined, which was beneficial to the balance and integrity of
the ecosystem.
KEYWORDS: prey fish, ecosystem, FISAT II, population dynamics, fishery management, Songhua River
(全文见 https://www.frontiersin.org/articles/10.3389/fmars.2023.1166634/full)
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