Reproductive indices and observations of mass ovarian follicular atresia in hatchery-origin pallid sturgeon

IF 0.7 4区 农林科学 Q4 FISHERIES Journal of Applied Ichthyology Pub Date : 2022-06-17 DOI:10.1111/jai.14339
Tanner L. Cox, Christopher S. Guy, Luke M. Holmquist, Molly A. H. Webb
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引用次数: 3

Abstract

The Pallid Sturgeon (Scaphirhynchus albus) Conservation Propagation and Stocking Program began stocking in the Missouri River above Fort Peck Reservoir in 1998 with 1997-year-class pallid sturgeon. Within the 1997-year class, all hatchery-origin pallid sturgeon females that reached reproductive maturation by 2016 underwent mass ovarian follicular atresia. Using combined historical and contemporary data, we described the spawning periodicity for female and male pallid sturgeon, characterized age- and size-at-first spawning, and evaluated what proportion of females experience mass ovarian follicular atresia during the first and subsequent reproductive cycles. Pallid sturgeon reached their first reproductive cycle at older ages and larger sizes than described for other populations. Females were functionally and physiologically capable of spawning at 21 years and males at 15 years. Immature pallid sturgeon as old as 20 years were documented. We found that more female pallid sturgeon underwent mass ovarian follicular atresia during the presumed-first reproductive cycle or known-first reproductive cycle than females during subsequent reproductive cycles (62.5% compared to 33.3%) indicating that effects related to reproductive maturation may be occurring. Nonetheless, mass ovarian follicular atresia appears to also occur for reasons not related to reproductive maturation. Females had biennial reproductive cycles, and males had annual and biennial reproductive cycles. Population models should account for females undergoing mass ovarian follicular atresia in their first reproductive cycle and subsequent cycles thereby increasing the age at first-successful spawning and reducing the estimated size of the spawning stock.

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孵化场源白鲟大量卵泡闭锁的生殖指标及观察
白鲟(Scaphirhynchus albus)保护繁殖和放养计划于1998年开始在佩克堡水库上方的密苏里河放养1997年级的白鲟。在1997年的班级中,所有在2016年达到生殖成熟的孵化场起源的白鲟雌性都经历了大量卵巢卵泡闭锁。结合历史和当代数据,我们描述了雌性和雄性苍白鲟鱼的产卵周期,特征的年龄和尺寸首次产卵,并评估了在第一个和随后的生殖周期中,雌性经历大量卵泡闭锁的比例。与其他种群相比,白鲟在更大的年龄和更大的体型上达到了它们的第一个生殖周期。雌鱼在21岁时和雄鱼在15岁时具有产卵功能和生理能力。有20岁的未成熟白鲟的记录。我们发现,在假设的优先生殖周期或已知的优先生殖周期中,更多的雌性苍白鲟鱼在随后的生殖周期中发生了大量卵巢卵泡闭锁(62.5%比33.3%),这表明可能发生了与生殖成熟相关的影响。尽管如此,大量卵巢卵泡闭锁似乎也发生与生殖成熟无关的原因。雌性有两年一次的生殖周期,雄性有一年一次和两年一次的生殖周期。种群模型应考虑到雌性在其第一个生殖周期和随后的周期中经历大量卵巢卵泡闭锁,从而增加了首次成功产卵的年龄,并减少了产卵种群的估计大小。
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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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