Assessment of fishery management parameters for major prey fish species in the lower reaches of the Songhua River

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