Invasive species are a key threat to biodiversity in freshwater ecosystems; and, as such, their management can be an important part of ecosystem restoration and conservation. In Hamilton Harbour, an impaired Lake Ontario embayment, invasive species are an important threat. In the early 2000s, an increase in invasive goldfish (Carassius auratus) was identified during monitoring surveys. This population of goldfish was studied via acoustic telemetry to gain knowledge about its biology to support management control options. Hamilton Harbour goldfish exhibited seasonal patterns in site and depth use, and clear preferences for over-wintering and spawning areas. Goldfish were largely resident to Hamilton Harbour with the exception of one individual. To predict when goldfish would move into spawning areas, we examined goldfish presence, abundance, and temperature at a fish-barrier connected to the harbour and developed models to predict goldfish presence based on Cumulative Growing Degree Days (CGDD) and Day of Year (DOY). Goldfish were captured in large numbers (>100 day⁻¹) at the fishway when CGDD > 25.0 and DOY > 100; therefore, we predicted that our tagged fish would move to spawning areas when these thresholds were reached. Both models accurately predicted when tagged fish moved to spawning areas which largely occurred when water temperatures were lower (≥ 9.7 °C) than thresholds previously identified in the literature (i.e., 15.0 °C − 22.0 °C). This suggested that pre-spawn/staging behaviour was detected using telemetry driven by factors including water temperature. Results from this work will inform control strategies for goldfish, including active removal during aggregation prior to spawning.

入侵物种是淡水生态系统生物多样性的主要威胁；因此，它们的管理可以成为生态系统恢复和保护的重要组成部分。在汉密尔顿港，安大略湖海湾受损，入侵物种是一个重要的威胁。2000年代初，监测调查发现入侵性金鱼（ Carassius auratus ）有所增加。通过声学遥测技术对金鱼种群进行了研究，以获得有关其生物学的知识，以支持管理控制方案。汉密尔顿港金鱼在地点和深度使用方面表现出季节性模式，并对越冬和产卵区域有明显的偏好。除了一只金鱼外，大部分金鱼都居住在汉密尔顿港。为了预测金鱼何时进入产卵区，我们检查了与港口相连的鱼屏障处金鱼的存在、丰度和温度，并开发了基于累积生长度日 (CGDD) 和一年中的日 (DOY) 来预测金鱼存在的模型）。当CGDD > 25.0且DOY > 100时，鱼道内大量捕获金鱼（>100天^{-1 ）；}因此，我们预测当达到这些阈值时，标记的鱼将移动到产卵区域。两种模型都准确预测了标记的鱼何时移动到产卵区，这主要发生在水温低于（≥ 9.7 °C）低于文献中先前确定的阈值（即 15.0 °C – 22.0 °C）时。这表明使用由水温等因素驱动的遥测技术检测到产卵前/分期行为。这项工作的结果将为金鱼的控制策略提供信息，包括在产卵前聚集期间主动去除。