LU Wan-qiao1, WANG Ji-long1, LIU Wei1*, LI Pei-lun1, CUI Kang-cheng1,2, TANG Fu-jiang1, YIN Zeng-qiang3
1.Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; 2.College of Fisheries and Life, Shanghai Ocean University, Shanghai 201306, China; 3.College of Marine Science and Environment, Dalian Ocean University, Dalian 116023, China
Abstract: Body length and body weight composition was measured, and growth inflexion age for body weight and the critical age and biomass were calculated in 250 individuals of Amur ide Leuciscuswaleckiisampled by net gills with mesh of 2 cm, 4 cm, and 6 cm and traps from the downstream of Tangwang River, based on the 2017-2018 survey in order to understand the resource status of Amur ide. The results showed that the body length growth equation was expressed asLt=351.75×(1-e-0.26(t+0.5448))and the body weight growth equation was described asWt=840.04×(1-et+ 0.5448)3.173, with the weight growth inflection age of 3.896 years, critical age of 3.361 years, total mortality (Z) of 0.945, natural mortality(M) of 0.443, fishing mortality (F) of 0.502, and the development rate (E) of 53.1%. The biomass in this area was shown to be about 258.27 t, and the population number 1.992 7 million. The resource status revealed that the Amur ide in this area had catchable body length of about 224.34-240.89 mm, and catchable body weight of some 201.61-252.71 g, indicating that the stock resource status of Amur ide in the downstream of Tangwang River can be utilized via regulation of catching size, though stock resource status of Amur ide is overexploitation.
2019, Vol. 34 
