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Age estimation, corroboration and back-calculation of four-spot megrim (Lepidorhombus boscii) on the Porcupine Bank using otoliths
Estuarine, Coastal and Shelf Science ( IF 2.6 ) Pub Date : 2020-07-10 , DOI: 10.1016/j.ecss.2020.106890
Jorge Landa , Carmen Hernández

Age and growth of four-spot megrim (Lepidorhombus boscii) at the Porcupine Bank, an important European demersal fisheries area, was estimated for the first time based on the analysis of 1334 otoliths. The state of the stock in the Celtic Seas (including the Porcupine Bank) and the northern Bay of Biscay (Div. 7.b-k and 8.a,b,d) has been recently assessed in ICES mainly based on survey abundance indices, but biological information for a forthcoming age-structured stock assessment process is required. In this study, age was estimated by counting the translucent bands (annuli) of the sagittal otoliths following internationally standardized protocols. Otoliths were obtained from specimens caught during five annual bottom trawl surveys (2008–2012) carried out at the Porcupine Bank. Consistency in age interpretation of four-spot megrim was demonstrated by analyzing the regularity of the distances of the annuli to the otolith's primordium and by the back-calculation of the annuli. The growth patterns obtained from direct otolith age estimation and from back-calculation were also compared. Age estimation was corroborated by tracking year-class abundance indices from the surveys. The strength of the year-classes was well tracked in abundant first age groups, highlighting the very abundant 2008 year-class. Furthermore, the von Bertalanffy growth parameters by sex and for combined sexes were also estimated and compared with those from other stocks. The results obtained for these parameters in the combined sexes direct age estimation, their back-calculation and the combination of both methods (L: 50.093; k: 0.126; t0: −0.296) will allow the upcoming age-structured assessment of this stock and thus a suitable population management. The strength of the cohorts here obtained was compared with those from a previous study in the Iberian Atlantic (8.c, 9.a) stock and based on age estimates calculated with the same ageing criterion. The differences in demographic structure and cohort dynamics found between stocks support the requirement that each stock continues to be assessed based on its respective age estimates and length distributions.



中文翻译:

使用耳石在豪猪库中的四点法氏菌(Lepidorhombus boscii)的年龄估计,确证和反算

四点黑麦草(Lepidorhombus boscii)的年龄和生长)是在对1334个耳石的分析的基础上,首次对欧洲重要的海底渔业区豪猪银行进行了估算。最近,ICES主要根据调查丰度指数对凯尔特海(包括豪猪银行)和比斯开湾北部(第7.bk和8.a,b,d区)的种群状况进行了评估,但需要有关即将进行的按年龄结构的种群评估过程的生物学信息。在这项研究中,根据国际标准化协议,通过计算矢状耳石的半透明带(环形)来估计年龄。耳石是从在豪猪银行进行的五次年度海底拖网调查(2008-2012年)中捕获的标本获得的。通过分析瓣环到耳石原基的距离的规律性以及通过对瓣环的反算,证明了四点黑体年龄解释的一致性。还比较了直接耳石年龄估计和反向计算获得的生长模式。通过跟踪调查中的年级丰度指数来证实年龄估计。年级学生的实力在丰富的第一年龄组中得到了很好的跟踪,突显了非常丰富的2008年级学生。此外,还估算了按性别和性别划分的冯·贝塔兰菲的生长参数,并与其他种群的参数进行了比较。在结合性别的直接年龄估计,他们的反向计算以及两种方法的结合中,针对这些参数获得的结果(L s原基和环的反算。还比较了从直接耳石年龄估计和反向计算获得的生长模式。通过跟踪调查中的年级丰度指数来证实年龄估计。年级学生的实力在丰富的第一年龄组中得到了很好的跟踪,突显了非常丰富的2008年级学生。此外,还估算了按性别和性别划分的冯·贝塔兰菲的生长参数,并与其他种群的参数进行了比较。在结合性别的直接年龄估计,他们的反向计算以及两种方法的结合中,针对这些参数获得的结果(L s原基和环的反算。还比较了从直接耳石年龄估计和反向计算获得的生长模式。通过跟踪调查中的年级丰度指数来证实年龄估计。年级学生的实力在丰富的第一年龄组中得到了很好的跟踪,突显了非常丰富的2008年级学生。此外,还估算了按性别和性别划分的冯·贝塔兰菲的生长参数,并与其他种群的参数进行了比较。在结合性别的直接年龄估计,他们的反向计算以及两种方法的结合中,针对这些参数获得的结果(L 通过跟踪调查中的年级丰度指数来证实年龄估计。年级学生的实力在丰富的第一年龄组中得到了很好的跟踪,突显了非常丰富的2008年级学生。此外,还估算了按性别和性别划分的冯·贝塔兰菲的生长参数,并与其他种群的参数进行了比较。在结合性别的直接年龄估计,他们的反向计算以及两种方法的结合中,针对这些参数获得的结果(L 通过跟踪调查中的年级丰度指数来证实年龄估计。年级学生的实力在丰富的第一年龄组中得到了很好的跟踪,突显了非常丰富的2008年级学生。此外,还估算了按性别和性别划分的冯·贝塔兰菲的生长参数,并与其他种群的参数进行了比较。在结合性别的直接年龄估计,他们的反向计算以及两种方法的结合中,针对这些参数获得的结果(L:50.093; k:0.126。t 0:−0.296)将允许对该种群进行年龄结构的评估,从而进行适当的种群管理。将此处获得的队列强度与先前在伊比利亚大西洋地区(8.c,9.a)的研究中的强度进行比较,并基于使用相同老化标准计算出的年龄估算。在种群之间发现的人口结构和队列动力学差异支持以下要求:继续根据各自的年龄估计和长度分布来评估每种种群。

更新日期:2020-08-02
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