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Temporal variability in the reproductive parameters of deepwater rockfishes in the Gulf of Alaska
Fisheries Research ( IF 2.4 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.fishres.2021.105876
Christina L. Conrath , Peter-John F. Hulson

Reproductive parameters directly influence estimates of stock biomass and therefore affect the determination of catch levels of many federally managed fish species. These parameters can vary over different temporal scales and a better understanding of how and why reproductive traits change will aid in the management of these species. We examined the reproductive parameters of rougheye rockfish, Sebastes aleutianus, and shortraker rockfish, S. borealis, captured in December 2015 and compared them with parameters from an earlier published study. Maturity values in the earlier study were derived from samples collected in from 2008 to 2014 with a concentration of fish collected in the winter of 2009 and 2010. Rougheye rockfish had a smaller length and age at maturity during 2015 (447 mm, 17.7 years) compared to the earlier sampling period (450 mm, 19.6 years), but neither the interaction of length and time period (P = 0.507) nor the interaction of age and time period (P = 0.270) was significant. Shortraker rockfish also had a smaller length at maturity during 2015 (467 mm) compared to the earlier period of time (499 mm) and the interaction of length and time period was not significant (P = 0.830). Relative fecundity for rougheye rockfish was not significantly different between the two time periods (P = 0.444) and this was also true for shortraker rockfish (P = 0.341). Skipped spawning rates were significantly lower in 2015 for both rougheye rockfish (2010 = 37.4 %, 2016 = 21.8 %, P < 0.001) and shortraker rockfish (2010 = 60.0 %, 2016 = 47.0 %, P < 0.001). This study was a first step in examining how reproductive parameters for these species may change over time. A comprehensive approach to examining temporal trends in reproductive parameters will aid in the understanding of how changing environmental conditions are affecting the productivity of commercially important species.



中文翻译:

阿拉斯加湾深水石鱼繁殖参数的时间变化

繁殖参数直接影响种群生物量的估计,因此影响许多联邦管理鱼类的捕捞水平的确定。这些参数可以在不同的时间尺度上变化,并且更好地了解生殖性状如何以及为什么发生变化将有助于对这些物种的管理。我们研究了阿留申平鲉,生殖参数平鲉属aleutianus,和北方平鲉,S.北极光,于2015年12月拍摄,并将其与较早发表的研究中的参数进行了比较。较早的研究中的成熟度值是从2008年至2014年收集的样本中得出的,其中鱼的浓度在2009年和2010年冬季收集。与2015年相比,ough眼石鱼的成熟时长和年龄较小(447毫米,17.7年)到较早的采样期(450 mm,19.6年),但长度和时间段的交互作用(P = 0.507)和年龄和时间段的交互作用(P = 0.270)均不显着。与更早的时间段(499毫米)相比,2015年Shortraker石鱼的成熟长度也更短(467毫米),并且长度和时间段的相互作用不显着(P = 0.830)。粗糙眼石鱼的相对繁殖力在两个时间段之间无显着差异(P = 0.444),而短尾er鱼也是如此(P = 0.341)。2015年,粗眼石鱼(2010 = 37.4%,2016 = 21.8%,P <0.001)和短尾石斑鱼(2010 = 60.0%,2016 = 47.0%,P <0.001)的产卵率显着降低。这项研究是检验这些物种的生殖参数如何随时间变化的第一步。研究生殖参数时间趋势的综合方法将有助于了解不断变化的环境条件如何影响重要商业物种的生产力。2015年,粗眼石鱼(2010 = 37.4%,2016 = 21.8%,P <0.001)和短尾石斑鱼(2010 = 60.0%,2016 = 47.0%,P <0.001)的产卵率显着降低。这项研究是检验这些物种的生殖参数如何随时间变化的第一步。研究生殖参数时间趋势的综合方法将有助于了解不断变化的环境条件如何影响重要商业物种的生产力。2015年,粗眼石鱼(2010 = 37.4%,2016 = 21.8%,P <0.001)和短尾石斑鱼(2010 = 60.0%,2016 = 47.0%,P <0.001)的产卵率显着降低。这项研究是检验这些物种的生殖参数如何随时间变化的第一步。研究生殖参数时间趋势的综合方法将有助于了解不断变化的环境条件如何影响重要商业物种的生产力。

更新日期:2021-01-14
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