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| Fecundity of Pseudecheneis sulcatus in Downstream of Yarlung Zangbo River in Xizang |
| JIN Hongyu1,2,3,4, LI Lei1, JIN Xing1, WANG Nianmin1, MA Qingzhi1, YIN Jiasheng1, MA Bo1 |
1. Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China;
2. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201316, China;
3. Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201316, China;
4. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201316, China |
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Abstract Fecundity was investigated in 78 samples of mature female Pseudecheneis sulcatus collected by a gill net with mesh size of 1—3 cm in March and July of 2018 in Motuo section (N 29°18′,E 95°16′,sea level of 680 m) of the lower reaches of the Yarlung Zangbo River in Xizang using individual biological methods. The results showed that the breeding population of P. sulcatus was consisted of 6 age classes from 4 to 9 years old, with absolute fecundity (F) ranging from 346.00 eggs/ind to 799.00 eggs/ind, an average of 498.00 eggs/ind. The relative fecundity was ranged from 3.36 to 5.53 eggs/mm for body length(FL), with an average of (4.45±0.47) eggs/mm, and from 20.69 to 92.80 eggs/g for body weight (Fm), with an average of (41.33±16.18) eggs/g. The regression equation between body weight (m) and body length (L) was expressed as m=0.6632L-54.924 (r2=0.9215). The regression equation between absolute fecundity (F) and body length (L) was described as F=7.229lnL-302.01 (r2=0.913), and the regression equation between absolute fecundity (F) and body weight (m) as F=10.343m+307.16 (r2=0.889).The regression equation between absolute fecundity (F) and body length (L), gonado-somatic index (GSI) and condition factor (K) was expressed as F=-446.369+6.567L+480.757GSI+10 815 864.49K (r2=0.930), and multiple linear standardized regression analysis equation of relative fecundity (Fm) between body weight and body length, body weight, ovary weight (mo), GSI, and K as Fm=133.990-0.899L+2.819m-15.044mo+231.368GSI-3 962 785.189K (r2=0.938). The analysis of gonadal development and egg diameter revealed that P. sulcatus was suggested to be once spawning a year.
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Received: 09 August 2019
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