College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China.
J Fish Biol. 2024 Feb;104(2):399-409. doi: 10.1111/jfb.15324. Epub 2023 Feb 6.
The age, growth, reproduction and resource development status of Ptychidio jordani, as a critically endangered freshwater fish in the Hongshui River, China, was studied in this work. A total of 525 specimens were collected monthly using the cages and gillnets from October 2021 to September 2022 in the Hongshui River. The scale was used for age determination, and the maximum age for both female and male was estimated to be 5 years and 3 years, respectively. Female and male P. jordani showed different growth patterns, which were expressed as L = 261.3 (1-e ) and L = 251.2 (1-e ), respectively. The overall sex ratio was 1:0.47 (female:male). Female attained sex maturity at 2.34 years (192 mm body length). Month variation of the gonad somatic index indicated that the spawning period occurred from April to October. The absolute fecundity was estimated at 9046 ± 3434 eggs per individual, and the relative fecundity was 38.08 ± 15.77 eggs per gram. The exploitation rate of female and male was 0.233 and 0.495, which indicated that P. jordani was not overfishing. This study provided data on the key life-history traits of P. jordani, which has not been known previously and is essential for conservation strategy and policy development.
本研究对中国红水河极度濒危淡水鱼类乔氏鱲的年龄、生长、繁殖和资源开发状况进行了研究。2021 年 10 月至 2022 年 9 月，每月使用笼和刺网在红水河采集 525 个标本。采用鳞片鉴定年龄，雌雄个体的最大年龄估计分别为 5 龄和 3 龄。雌雄乔氏鱲表现出不同的生长模式，分别表示为 L = 261.3（1-e ）和 L = 251.2（1-e ）。总体雌雄性别比为 1:0.47（雌:雄）。雌鱼在 2.34 龄（192 mm 体长）达到性成熟。性腺体指数的月变化表明，产卵期从 4 月持续到 10 月。绝对繁殖力估计为每个个体 9046 ± 3434 个卵，相对繁殖力为 38.08 ± 15.77 个卵/克。雌鱼和雄鱼的捕捞率分别为 0.233 和 0.495，表明乔氏鱲尚未过度捕捞。本研究提供了乔氏鱲关键生活史特征的数据，这些数据以前未知，对保护策略和政策制定至关重要。
