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The growth and age structure of Chilean jack mackerel ( Trachurus murphyi ) following its influx to New Zealand waters
Journal of Fish Biology ( IF 2 ) Pub Date : 2020-12-29 , DOI: 10.1111/jfb.14647
Peter L. Horn 1, 2 , Caoimhghin Ó Maolagáin 1
Affiliation  

The Chilean jack mackerel (Trachurus murphyi) is a predominantly Southeast Pacific Ocean species. It is relatively difficult to determine its age, and multiple studies of its growth off South America have produced markedly different sets of von Bertalanffy parameters. T. murphyi was first identified from New Zealand waters in the mid-1980s and has comprised part of the commercial landings of Trachurus species (along with T. declivis and T. novaezelandiae) since then. Results from 13 years of age determination of New Zealand samples using sectioned otoliths indicate that a partially validated age determination method has been developed, with a precision level (APE) of 4.6%. The best available von Bertalanffy growth parameters for the New Zealand population (sexes combined) are: L∞, 51.9 cm fork length; K, 0.223 yr.-1; t0, -0.5 yr. Analyses by sex showed that males have a significantly larger L∞ than females. Estimated annual catch-at-length and catch-at-age distributions from the fishery are presented for 2007 to 2019. There have been at least two episodes of immigration of T. murphyi from international waters, but little evidence of spawning success to maintain the New Zealand population. This article is protected by copyright. All rights reserved.

中文翻译:

智利鲭鱼(Trachurus murphyi)涌入新西兰水域后的生长和年龄结构

智利鲭鱼 (Trachurus murphyi) 是一种主要分布于东南太平洋的物种。确定它的年龄相对困难,对它在南美洲外生长的多项研究已经产生了明显不同的 von Bertalanffy 参数集。T. murphyi 于 1980 年代中期首次在新西兰水域中被发现,此后一直是 Trachurus 物种(以及 T. declivis 和 T. novaezelandiae)的商业登陆的一部分。使用切片耳石对新西兰样本进行 13 年年龄测定的结果表明,已经开发出一种经过部分验证的年龄测定方法,其精度水平 (APE) 为 4.6%。新西兰人口(性别合并)的最佳可用 von Bertalanffy 生长参数是: L∞,51.9 cm 叉长;K,0.223 年-1;t0,-0.5 年。按性别进行的分析表明,男性的 L∞ 明显大于女性。提供了 2007 年至 2019 年渔业年度总捕捞长度和捕捞年龄分布的估计值。至少有两次 T. murphyi 从国际水域迁入,但几乎没有证据表明产卵成功以维持新西兰人口。本文受版权保护。版权所有。
更新日期:2020-12-29
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