Life-history characteristics of Theodore’s threadfin bream, Nemipterus theodorei (Ogilby, 1916), and the yellow-lip butterfly bream, Nemipterus aurifilum (Ogilby, 1910), from southern Queensland, Australia

Q4 Earth and Planetary Sciences
Jaimee Joiner, Matthew Campbell, James Haddy, Anthony Courtney
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Abstract

Theodore’s threadfin bream (Nemipterus theodorei) and the yellow-lip butterfly bream (Nemipterus aurifilum) are two of the most common nemipterids in eastern Queensland. These two species are caught incidentally and at times retained for sale as ‘permitted’ species in Australia’s largest trawl fishery, the Queensland East Coast Otter Trawl Fishery (QECOTF). Despite their prevalence, little biological information is available for these species. This paper reports key life-history characteristics of these nemipterids. Growth and length-at-maturity parameters were estimated from samples collected in southern Queensland. Growth parameters were estimated using back-calculation of fork length (FL) from otolith increment data and modelled within a Bayesian framework to overcome bias resulting from the small number of larger, older animals in the retained bycatch. The von Bertalanffy growth function (VBGF) was identified as the most appropriate growth model with significant differences in sex-specific growth rates evident for both species. Maximum ages were six and four years for N. theodorei and N. aurifilum respectively, with individuals maturing within their first year of life. The length-at-maturity for females was 91 mm FL and 77 mm FL for N. theodorei and N. aurifilum respectively. Increased reproductive activity was observed in the austral spring and summer months. The results from this study can be used to assess the ecological risk posed to these species by the QECOTF.
澳大利亚昆士兰南部的线鲷Nemipterus theodorei (Ogilby, 1916)和黄唇蝶鲷Nemipterus aurifilum (Ogilby, 1910)的生活史特征
金缕鲷(Nemipterus theodorei)和黄唇蝶鲷(Nemipterus aurifilum)是昆士兰东部最常见的两种金缕鲷。这两种水獭是偶然捕获的,有时在澳大利亚最大的拖网渔场——昆士兰东海岸水獭拖网渔场(QECOTF)中作为“允许”物种出售。尽管它们普遍存在,但关于这些物种的生物学信息却很少。本文报道了这些蛇足类动物的主要生活史特征。从南昆士兰收集的样本中估计了生长和成熟长度参数。根据耳石增量数据反算叉长(FL)来估计生长参数,并在贝叶斯框架内建模,以克服因保留的副渔获物中较大、较老的动物数量较少而产生的偏差。冯贝塔朗菲生长函数(von Bertalanffy growth function, VBGF)是最合适的生长模型,两种物种的性别特异性生长速率存在显著差异。龙葵和金翅龙葵的最大年龄分别为6岁和4岁,个体在一岁内成熟。雌虫的成熟体长为91 mm,雌虫的成熟体长为77 mm。在南方春季和夏季,繁殖活动增加。本研究结果可用于评价QECOTF对这些物种构成的生态风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Memoirs of the Queensland Museum
Memoirs of the Queensland Museum Environmental Science-Ecology
CiteScore
0.70
自引率
0.00%
发文量
2
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