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首页> 外文期刊>ICES Journal of Marine Science >Scampi (Metanephrops challengeri) emergence patterns and catchability
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Scampi (Metanephrops challengeri) emergence patterns and catchability

机译：Scampi（Metanephrops Challengeri）的出苗方式和可捕性

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摘要

Catchability is often a key source of uncertainty with any stock assessment, but especially for burrowing species, as their emergent behaviour is often poorly understood. Quantification of catchability will provide a major step towards improvements in the assessment for many species. Scampi (Metanephrops challengeri) are widely distributed around New Zealand, and as with Nephrops (Norway lobster), they occupy burrows in muddy substrate, and are exploited through trawl fisheries, but are only available to these fisheries when emerged on the seabed. Burrow emergence is known to vary over daily and longer cycles. Uncertainty over trawl catchability associated with emergence patterns has led to the development of photographic survey approaches for scampi, based on the counts of burrows. Both survey approaches require an understanding of burrow occupancy and emergence rates to estimate trawl/photo survey catchability, which is a key source of uncertainty. We used acoustic tagging to examine levels of and patterns in the emergence of Metanephrops, using hydrophone receivers moored close to the seabed. Strong emergence cycles were apparent in relation to tidal current (higher emergence with inshore water flow across the slope) and time of day (peaking just after dawn). These data have subsequently been used within a length-based stock assessment of New Zealand scampi, which uses emergence data in conjunction with burrow and animal counts from photographic surveys, for the first time, to inform priors for trawl (mean 0.094) and photographic (mean 0.46) survey catchability, and for burrow occupancy (mean 49.3%).
机译：在任何种群评估中，可捕获性通常是不确定性的主要来源，但对于穴居物种而言尤其如此，因为人们对它们的突现行为通常知之甚少。量化捕获能力将为改善许多物种的评估迈出重要的一步。 Scampi（Metanephrops Challengeri）广泛分布于新西兰各地，与Nephrops（Norway龙虾）一样，它们在泥质底质中占据洞穴，并通过拖网渔业进行开采，但仅当出现在海底时才可用于这些渔业。已知洞穴的出现在​​每天和更长的周期中会有所不同。与出现方式相关的拖网可捕性的不确定性已导致基于洞穴计数的海底摄影调查方法的发展。两种调查方法都需要了解洞穴的占用率和出现率，以估计拖网/照片调查的可捕获性，这是不确定性的关键来源。我们使用系泊在靠近海床附近的水听器，通过声学标签检查后生动物的水平和模式。与潮汐流（越过斜坡的近岸水流出现更高的涌出量）和一天中的时间（黎明后才出现峰值）有关，强烈的涌出周期很明显。这些数据随后被用于基于长度的新西兰Scampi种群评估中，该评估首次将涌现数据与摄影调查中的洞穴和动物计数结合使用，以告知拖网捕捞先验（平均0.094）和摄影（平均值为0.46），调查的可捕获性以及洞穴的使用率（平均值为49.3％）。

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