Quantifying how the heart rate of ectothermic organisms responds to environmental conditions (e.g. water temperature) is important information to quantify their sensitivity to environmental change. Heart rate studies have typically been conducted in lab environments where fish are confined. However, commercially available implantable heart rate biologgers provide the opportunity to study free-swimming fish. Our study aimed to determine the applicability of an implantable device, typically used on fusiform-shaped fish (e.g. salmonids), for a perciform fish where morphology and anatomy prevent ventral incisions normally used on fusiform-shaped fish. We found that ventrolateral incisions allowed placement near the heart, but efficacy of the loggers was sensitive to their orientation and the positioning of the electrodes. Electrocardiogram detection, signal strength and subsequent heart rate readings were strongly influenced by logger orientation with a significant effect on the quality and quantity of heart rate recordings. We provide details on the surgical procedures and orientation to guide future heart rate biologger studies on perciform-shaped fish.

中文翻译：

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商业生产的心律记录仪的植入，定位和验证，用于鲈形硬骨鱼。

量化吸热生物体的心率对环境条件（例如水温）的反应是量化其对环境变化敏感性的重要信息。心率研究通常是在密闭鱼类的实验室环境中进行的。然而，可商购的植入式心率生物记录仪为研究自由游动的鱼类提供了机会。我们的研究旨在确定通常用于梭形鱼（例如鲑鱼）的可植入设备在形态和解剖学上通常防止用于梭形鱼腹侧切口的鲈鱼的适用性。我们发现腹侧切口可以放置在心脏附近，但是记录仪的功效对其方向和电极位置很敏感。心电图检测 信号强度和随后的心率读数会受到记录仪方向的强烈影响，这对心率记录的质量和数量有很大影响。我们提供有关外科手术程序和方向的详细信息，以指导未来对心形鱼的心率生物记录器研究。