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首页> 外文期刊>Journal of Fish Biology >Effects of sampling techniques on population assessment of invasive round goby Neogobius melanostomus
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Effects of sampling techniques on population assessment of invasive round goby Neogobius melanostomus

机译:采样技术对入侵性虾虎鱼黑潮病种群评估的影响

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摘要

In this study, a comparison of point abundance sampling (PAS) electrofishing, angling with two different hook sizes and trap-based fishing was performed in a non-wadeable river to analyse their effects on catch per unit effort (CPUE) and population characteristics of invasive round goby Neogobius melanostomus. PAS electrofishing was identified as the most effective (mean +/- s.e. CPUE=57 +/- 4 N. melanostomus min-1) and least selective method in terms of size, feeding status and species composition. Angling had the second highest CPUE, but was more size selective and resulted in a higher proportion of males compared to electrofishing [overall sex ratio angling (female:male)=1:092, electrofishing 1:065]. Owing to low CPUE (0012+/- 0004) and low frequency of occurrence, minnow traps were least suitable for N. melanostomus population assessment. The results of this study suggest that a higher degree of standardization and inter-calibration is useful to achieve better comparability of population data of invasive N. melanostomus and other benthic fish species.
机译:在这项研究中,在一条无法步行的河流中进行了点丰度采样(PAS)电钓鱼,两种不同大小的钩钓和基于陷阱的捕捞的比较,以分析它们对单位捕捞量(CPUE)和种群特征的影响。侵袭性虾虎鱼Neogobius melanostomus。就规模,摄食状况和物种组成而言,PAS电钓鱼被认为是最有效的方法(平均+/- s.e. CPUE = 57 +/- 4 N. melanostomus min-1),并且是最不具有选择性的方法。垂钓的CPUE排名第二,但与电钓相比,尺寸选择更具选择性,并且导致雄性的比例更高[总体性别比例垂钓(女:男)= 1:0 92 ,电钓1:0 65 ]。由于CPUE低(0 012 +/- 0 004 )且发生频率低,因此,小鱼陷阱最不适合用于评估黑鼻猪笼草的种群。这项研究的结果表明,更高程度的标准化和相互校准对于实现入侵性黑鼻猪笼草和其他底栖鱼类种群数据的更好可比性很有用。

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