Critical swimming speed associated with body shape of Chinese sturgeon Acipenser sinensis under different rearing conditions
Ming Duan1,2, Yi Qu1,3, Juan Yan1,3, Longzhen Zhang1, Guangpeng Feng1, Jianyi Liu1, Tao Zhang1, Junli Hou1, Xiaorong Huang1, Feng Zhao1, Wengang Yan1, Shuai Chen1, Hongliang Huang1, Ping Zhuang1,3*
1Key and Open Laboratory of Marine and Estuarine Fisheries Resources and Ecology, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200090, China
2State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
3College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201316, China
It was hypothesized that differences of body shape between pond-reared and tank-reared juvenile Chinese sturgeon Acipenser sinensis may influence their swimming ability, and thus may play an important role in their stocking into the native population. In this study, morphological characters and critical swimming speed (Ucrit) of the pond-reared (body weight, BW = 1426.0 ± 53.8 g, n = 6) and tank-reared (BW = 1201.6 ± 91.4 g, n = 6) size-matched juvenile Chinese sturgeon were measured and compared. The Ucrit of pond-reared sturgeon was 81.3 ± 3.2 cm/s (relative critical swimming speed, Ucrit’ = 1.32 ± 0.04 SL/s), which was not significantly higher (P > 0.05) than that of the tank-reared cohort (Ucrit = 76.2 ± 1.9 cm/s, Ucrit’ = 1.40 ± 0.03 SL/s). Rearing condition had some significant effects on 12 of morphological characters of the Chinese sturgeon at their early life stage (P < 0.05), but there was only a tendency to be difference between the body shape variations as defined by PC1 (body and caudal length, body depth and caudal filament length) from the principal component analysis (PCA) with 12 size-adjusted morphological characters of the two different cohorts (P = 0.051). There was a significant negative relationship between Lg (Ucrit) (y) and PC1 (x), which could be described by the equation as follows: y = 1.897 - 0.002 x (r2 = 0.372, P = 0.035). These results indicated that rearing condition could not significantly influence the swimming ability associated with body shape of the juvenile Chinese sturgeon, but we should select streamline-bodied juveniles when releasing them into nature. Furthermore, the findings may be useful for a fish way and culvert design due to stringent regulatory requirement.
Keywords: Swimming performance, Body shape, Rearing condition, Chinese sturgeon, Acipenser sinensis