Investigating temporal variability and influence of condition on fecundity and spawning of spotted wolffish (Anarhichas minor) in Icelandic waters

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION Polar Biology Pub Date : 2024-03-17 DOI:10.1007/s00300-024-03229-w
Á. Gunnarsson, J. Kennedy, B. Elvarsson, A. R. Grétarsdóttir
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Abstract

Spotted wolffish (Anarhichas minor) is a poorly understood species which is often captured as part of mixed demersal fisheries across its range. Abundance has declined in many regions and there is a need for greater knowledge on its biology. To improve our understanding of reproduction of A. minor, we investigated inter- and intra- annual differences in fecundity, the influence of condition on fecundity and time scale of ovary development. From 2006 to 2021, 150 females A. minor were sampled in Icelandic waters. Of these females, 73 were also used to estimate spawning time together with an additional 334 females from commercial catch and surveys from 2006 to 2023. Backwards extrapolation of oocyte size indicates that vitellogenesis begins in December and is likely completed after 8–10 months. There was no evidence of either intra- or inter-annual differences in fecundity, indicating that downregulation is minimal and that fecundity of A. minor is stable between years. A positive relationship between oocytes size and fish length was detected, while body condition and hepatosomatic index had only a small influence on fecundity in comparison with weight. There was a negative relationship between length and relative fecundity and the exponent of the fecundity–length relationship was lower than exponent of the weight–length relationship. Therefore, total egg production is likely not proportional to the spawning stock biomass of A. minor, and unusually, total egg production would decrease with increasing proportion of larger fish in the population. The spawning season was estimated to be from middle of August to middle of October with peak of spawning in September.

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调查冰岛水域斑点狼鱼(Anarhichas minor)繁殖和产卵的时间变化和条件影响
斑狼鱼(Anarhichas minor)是一种鲜为人知的物种,在其分布区经常作为底层混合渔业的一部分被捕获。在许多地区,该物种的数量已经下降,因此有必要进一步了解其生物学特性。为了加深对小亚栉水母繁殖的了解,我们研究了其繁殖力的年际和年内差异、状态对繁殖力的影响以及卵巢发育的时间尺度。从 2006 年到 2021 年,我们在冰岛水域采集了 150 尾小尾寒羊雌性样本。在这些雌鱼中,有 73 只也被用于估算产卵时间,另外 334 只雌鱼来自 2006 年至 2023 年的商业捕捞和调查。对卵母细胞大小的倒推表明,卵黄发生始于 12 月,可能在 8-10 个月后完成。没有证据表明繁殖力在年内或年际间存在差异,这表明下调作用微乎其微,且未成年甲鱼的繁殖力在年际间保持稳定。卵细胞大小与鱼体长度之间存在正相关关系,而身体状况和肝脏指数与体重相比对繁殖力的影响很小。体长与相对受精率之间呈负相关,受精率-体长关系指数低于体重-体长关系指数。因此,总产卵量很可能与小尾寒羊的产卵种群生物量不成正比,而且不同寻常的是,总产卵量会随着种群中大型鱼类比例的增加而减少。产卵季节估计为 8 月中旬至 10 月中旬,9 月为产卵高峰期。
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来源期刊
Polar Biology
Polar Biology 生物-生态学
CiteScore
3.60
自引率
11.80%
发文量
116
审稿时长
3-8 weeks
期刊介绍: Polar Biology publishes Original Papers, Reviews, and Short Notes and is the focal point for biologists working in polar regions. It is also of interest to scientists working in biology in general, ecology and physiology, as well as in oceanography and climatology related to polar life. Polar Biology presents results of studies in plants, animals, and micro-organisms of marine, limnic and terrestrial habitats in polar and subpolar regions of both hemispheres. Taxonomy/ Biogeography Life History Spatio-temporal Patterns in Abundance and Diversity Ecological Interactions Trophic Ecology Ecophysiology/ Biochemistry of Adaptation Biogeochemical Pathways and Cycles Ecological Models Human Impact/ Climate Change/ Conservation
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