Refining age at legal-size estimation in the Newfoundland & Labrador populations of the snow crab Chionoecetes opilio (Fabricius, 1788) (Decapoda: Brachyura: Oregoniidae)

IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Journal of Crustacean Biology Pub Date : 2023-11-04 DOI:10.1093/jcbiol/ruad067
Darrell Mullowney, Nicole O’Connell, Raouf Kilada, Rémy Rochette
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Abstract

Abstract Current knowledge of age at legal size in Newfoundland & Labrador (NL) and other snow-crab stocks is incomplete due to historic estimations not accounting for skip-molting growth delays. Previous work has shown skip-molting incidence to occasionally be very high in males, both in NL and some other major snow-crab stocks. This warrants research to better understand impacts of skip-molting on snow-crab age and growth dynamics, which are central to population assessment and resource management. We simulated the impact of skip-molting on growth dynamics of snow crabs from three regions around NL by coupling a nineteen year time series of molt-type probabilities derived from field trawl surveys to historical data on age-at-instar based on cohort analysis of wild populations that do not consider skip-molting in making age estimations. Trawl surveys and simulations showed that skip-molting is a prominent feature in NL snow crabs, with up to four skip-molts being a reasonable maximum possible estimate for males in portions of the NL snow-crab stock. A complementary analysis examining the ability to age snow crabs using gastric mill band counts showed overall strong agreement with published growth trajectories that were modified to include skip-molting as well as reasonable average age approximations for most crabs, but unexpectedly high variability in age estimates for individuals of a same instar stage and unexpectedly low age estimates for younger crabs. Our study leads to a refinement of age at legal size for NL snow crab from the current nine-year estimate to a range of 9–13 years. Although this range is deemed to capture virtually every crab reaching legal size in NL snow-crab populations, ages higher than 11 years to fishery recruitment (2 skip-molts) are relatively infrequent.
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纽芬兰地区法定尺寸估算的精炼年龄雪蟹Chionoecetes opilio (fabicius, 1788)的拉布拉多种群(十足目:短肢目:雪蟹科)
纽芬兰法定体型年龄认知现状拉布拉多(NL)和其他雪蟹的库存是不完整的,因为历史估计没有考虑到跳脱生长延迟。以前的研究表明,在NL和其他一些主要的雪蟹种群中,雄性的跳脱率有时非常高。因此,有必要进行研究,以更好地了解跳脱对雪蟹年龄和生长动态的影响,这是种群评估和资源管理的核心。通过将野外拖网调查得出的19年的脱壳概率时间序列与基于队列分析的未考虑脱壳的野生种群的龄龄历史数据相结合,模拟了脱壳对NL周围三个地区雪蟹生长动态的影响。拖网调查和模拟表明,跳换是NL雪蟹的一个突出特征,在NL雪蟹的部分种群中,多达4次跳换是合理的最大可能估计。一项利用胃磨带计数检测雪蟹年龄的补充分析显示,与已发表的生长轨迹总体上非常一致,这些生长轨迹经过修改,包括了大多数螃蟹的跳脱和合理的平均年龄近代值,但在相同龄期的个体中,年龄估计的变异性出乎意料地高,而在更年轻的螃蟹中,年龄估计的变异性出乎意料地低。我们的研究将NL雪蟹的法定年龄从目前的9年估计提高到9-13年。尽管这一范围被认为几乎捕获了NL雪蟹种群中所有达到法定大小的螃蟹,但年龄超过11岁的渔业招募(2次跳脱)相对较少。
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来源期刊
Journal of Crustacean Biology
Journal of Crustacean Biology 生物-海洋与淡水生物学
CiteScore
2.10
自引率
9.10%
发文量
66
审稿时长
6-12 weeks
期刊介绍: The Journal of Crustacean Biology is the official journal of The Crustacean Society, publishing peer-reviewed research on all aspects of crustacean biology and other marine arthropods. Papers are published in English only, but abstracts or summaries in French, German, Portuguese, or Spanish may be added when appropriate.
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