Histological analysis of deepwater sculpin ovaries supports single spawning reproductive strategy

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research Pub Date : 2024-07-05 DOI:10.1016/j.jglr.2024.102375

Jarrod M Ludwig , Brian Weidel , Brian O’Malley , Michael Connerton , Jacques Rinchard

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引用次数: 0

Abstract

Deepwater sculpin (Myoxocephalus thompsonii) were considered extirpated from Lake Ontario prior to the 1990s but have since resurged and are now an abundant offshore demersal species. As deepwater sculpin reproduction is poorly described, an investigation of their gonadal development and fecundity was conducted to better understand their reproductive biology. To evaluate spawning period duration and if females spawn multiple times during their spawning period, we compared deepwater sculpin gonadosomatic index (GSI), gonadal development, and fecundity using individuals collected in fall and spring from 2018 to 2021. Our analysis revealed female GSI was greater in fall (8.1 ± 6.2 %) than spring (4.4 ± 4.3 %). Absolute fecundity averaged 763 ± 246 oocytes and relative fecundity averaged 19 ± 6 oocytes per gram of fish. Histological analysis revealed the presence of only one batch of developing oocytes in the ovary (n = 60), indicating group-synchronous ovarian organization. Our findings suggest deepwater sculpin spawn once annually but have a protracted spawning season indicated by prolonged elevated GSI values. Therefore, protracted spawning in deepwater sculpin likely results in an extended period of larval emergence rather than the majority occurring in late spring as previously suggested. A longer timeframe for deepwater sculpin larval emergence may increase reproductive success and contribute to their population’s recovery.

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深水鲭卵巢组织学分析支持单一产卵繁殖策略

20 世纪 90 年代之前，深水鲭（Myoxocephalus thompsonii）被认为已在安大略湖灭绝，但后来又重新出现，现在已成为一种丰富的近海底栖物种。由于对深水鳞栉鱼的繁殖描述很少，因此对其性腺发育和繁殖力进行了调查，以更好地了解其繁殖生物学特性。为了评估产卵期的持续时间以及雌性是否在产卵期多次产卵，我们利用2018年至2021年秋季和春季采集的个体，比较了深水鳞栉的性腺指数（GSI）、性腺发育和繁殖力。我们的分析表明，雌性 GSI 在秋季（8.1 ± 6.2 %）高于春季（4.4 ± 4.3 %）。绝对受精率平均为 763 ± 246 个卵母细胞，相对受精率平均为每克鱼 19 ± 6 个卵母细胞。组织学分析表明，卵巢中只存在一批发育中的卵母细胞（n = 60），这表明卵巢组织是群体同步的。我们的研究结果表明，深水鳞栉每年产卵一次，但产卵期较长，GSI 值长期升高就说明了这一点。因此，深水鳞栉的产卵期延长可能会导致幼虫出壳期延长，而不是像以前认为的那样，大部分幼虫出壳期发生在春末。延长深水鳞栉幼体萌发时间可能会提高繁殖成功率，有助于其种群恢复。

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来源期刊

Journal of Great Lakes Research 生物-海洋与淡水生物学

CiteScore

5.10

自引率

13.60%

发文量

178

审稿时长

6 months

期刊介绍： Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.