Growth of Hybrid Sturgeon Acipenser schrenckii♀×A. baeri♂during Early Development
XIONG Hualong1, JIANG Zuoyu1, LIANG Zhengqi2, YAO Junjie3
1.Rural Affairs Bureau of Weng′an County, Guizhou Province, Weng′an 550400, China; 2.Key Laboratory of Special Wildlife Resources in Fanjing Mountain, College of Agroforestry Engineering andPlanning, Tongren University, Tongren 554300, China; 3.Department of Fisheries Science, College of Animal Sciences,Guizhou University, Guiyang 550025, China
Abstract：Newly hatched larvae of hybrid sturgeon Acipenser schrenckii ♀× A. baeri ♂with body weight of (0.014±0.001) g were reared in a circular glass cylinder with diameter of 2 m and water depth of 15—25 cm at a density of 1500—2000 individuals/m2and fed tubificid worm (Limnodrilus hoffmeisteri) at water temperature of 7—14 ℃ for 87 days to investigate morphological characteristics, body weight and total length of the hybrid sturgeon. The newly hatched larvae had transparent body with small head and big yolk-sac, approximately equal to two-thirds of body length. The initial feeding was observed in 7 day old larvae in transition period from endogenous to exogenous nutrient and the nearly exhausted yolk-sac was found in 9 day old postlarvae, starting the exogenous nutrient. The organogenesis was basically perfected in 57 day old, and the external morphology consistent with adulthood. The postlarvae and juveniles had average daily total length gain of 1.67 mm and body weight gain of 0.25 g, with instantaneous growth rate of 2.26% in total length and 5.51% in body weight. The total length growth was expressed as linear relation with age, and the regressive equation was described as L=0.1546t+1.2357 (r2=0.9812). The body weight growth was found to be power functional relation with day age, and the weight cure expression was described as m=0.3379e0.0479t(r2=0.9851). The relationship between total length(L) and body weight(m) of the hybrid sturgeon was expressed as m=0.0289L2.3444(r2=0.993),with exponent of less than 3, indicating that the body weight growth, as allometric growth type, is slower than that of total length growth.
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2020, Vol. 39 
