【作者】 向邈； 张磊； 程飞； 谢松光；

【Author】 XIANG Miao;ZHANG Lei;CHENG Fei;XIE Songguang;Institute of Hydrobiology, Chinese academy of sciences;

【机构】 中国科学院水生生物研究所； 中国科学院大学；

【摘要】 中华沙塘鳢（Odontobutis sinensis）是长江中下游广泛分布的底栖小型鱼类,当前其资源衰退严重。本研究于2016年繁殖季节对洪湖中华沙塘鳢种群的年龄结构、生长和繁殖力进行研究,并结合历史数据分析其生物学特征的变化,探讨其应对资源衰退的生活史对策。研究显示洪湖中华沙塘鳢种群包括3个年龄组,其中1、2龄个体占97.9%;1龄、2龄和3龄个体体长（Ls）均值（M±SD）分别为9.0±1.1 cm、9.6±1.2cm和11.3±1.0 cm;相对繁殖力为53.5±22.1 eggs·g-1。与历史数据相比,洪湖中华沙塘鳢表现出明显的低龄化;1龄时生长较快,而后生长减缓（梁子湖,1957年:1龄,L_s=7.8cm;2龄,L_s=11.5cm;3龄,L_s=13.5cm;保安湖,1993-1994年:1龄,L_s=6.5cm;2龄,L_s=9.6cm,3龄,L_s=12.0cm;4龄,L_s=13.4cm）;相对繁殖力较大(梁子湖,32.5 eggs·g^-1;保安湖,45.4 eggs·g^-1)。洪湖中华沙塘鳢种群这种更加机会主义的生活史特征可能是其应对资源衰退的适应性反应。更多还原

【Abstract】 Odontobutis sinensis, a benthic freshwater fish, mainly distributes at shallow lakes along the middle and lower reaches of the Yangtze River. Population size of the fish has dramatically decreased recent years. In this study, age structure, growth and fecundity of the species were investigated in Honghu lake during breeding season in 2016, and these traits were compared with the published data of other lakes.The results will reveal variations of life history traits of the fish during process of resource recession. Estimated age of individuals in Honghu Lake ranged from 1 to 3 years, and age 1 and 2 accounted for 97.9% of the population. Standard length（Ls） of age 1, age 2 and age 3 individuals were 9.0±1.1 cm, 9.6±1.2 cm, and 11.3±1.0 cm. Relative fecundity of Honghu Lake population was 53.5±22.1 eggs·g^-1. Compared with the histories populations of Liangzi Lake（1957） and Baoan Lake（1993-1994）, it showed lower age classes, higher growth rate in age 1 and lower growth rate after age 1（Liangzi Lake: Ls =7.8 cm in age1, Ls =11.5 cm in age 2, Ls = 13.5 cm in age 3; Baoan Lake: Ls =6.5 cm in age 1, Ls =9.6 cm age 2, Ls =12.0 cm in age 3, Ls =13.4 cm in age 4）, and higher relative fecundity(32.5 eggs·g^-1 and 45.4 eggs·g^-1 in populations of Liangzi and Baoan lakes respectively). Our results indicated the population is likely to have opportunistic life history strategy during for process of decreasing resources.更多还原