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Triclosan (TCS) is an antimicrobial agent found in personal care products that has become prevalent in surface waters. TCS readily bioaccumulates within aquatic organisms, and has been found to be toxic to fish. In larval fishes, exposure to TCS disrupts a variety of developmental processes, impairs hatching success, and causes pericardial edema. In mammals, TCS exposure disrupts excitation-contraction-coupling in cardiac cells, which is associated with reductions in cardiac output. Here, we examine the impacts of TCS on heart function to better understand potential risks that TCS may pose to wild fish. Zebrafish were exposed to 0, 0.4, 40, and 400 μg TCS/L from 8 to 120 h postfertilization via static waterborne exposure with daily renewal. We examined the incidence of pericardial edema, and the impacts on heart structure and heart function. While incidence of pericardial edema increased following exposure to ≥40 μg TCS/L and the structure of the heart was altered, cardiac output was only reduced following exposure to 400 μg TCS/L. A small but significant proportion of embryos showed increased incidence of regurgitation following exposure to ≥0.4 μg TCS/L. Our findings suggest that acute exposure to TCS has the potential to cause subtle cardiac toxicity in developing fish, and further evaluation of the risks TCS pose to wild fish and human health is needed.

Why do employees fail to report a friend's misconduct, and if they do not report, how else do they cope with this ethical dilemma? Through two field studies, we offer a more nuanced understanding of the range of alternative responses between the extremes of silence (ignoring misconduct) and compliance (reporting), and we illuminate the underlying reasons for these choices. Our results reveal that most employees are inclined to attempt to resolve a friend‐reporting situation themselves, and further, that many employees hesitate to report a friend's misconduct for ethical reasons. Specifically, we show how an ethic of care expressed through empathy for the transgressor may play an important and previously unexamined role in friend‐reporting decisions, drawing attention to the consideration of empathy as a key emotion that can reduce compliance with reporting programmes. In addition to these important contributions to the literature, practitioners should also find this study useful, as it suggests new approaches to help employees better align their choices with the compliance goals of the organisation without sacrificing their valued friendships.

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