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"If we don't take robust, science-based, coherent measures to protect these highly endangered North Atlantic right whales, we're really playing Russian roulette with the entire future of the Canadian fish and seafood industry," Fisheries and Oceans Minister Dominic LeBlanc, CBC New Brunswick, 16 June 2018. Governments are required to demonstrate that they manage natural resources in an environmentally and economically sustainable manner. Evidence of an environmental conservation problem is often not considered sufficient by government to warrant a change in the way human activities are managed until the problem becomes a societal crisis (e.g., large effects on economics, operations or infrastructure). Governments are then challenged to nimbly implement effective reactionary measures that both solve the problem and protect livelihoods. The mass mortality of North Atlantic right whales (Eubalaena glacialis) that occurred over a 3 month period in Canadian waters in 2017 due at least in part to fishing gear entanglements and ship strike is an example of a situation wherein evidence of a growing conflict between whales and humans was not acted upon until it became an emergency. The disaster galvanized a number of recent federal environmental initiatives into a powerful government force that was able to collaborate with many non-government groups in promptly responding to the problem. This led to commendable implementation and enforcement of crisis management measures. However, implementation came after many mortalities had already occurred because management plans were developed extemporaneously. Further, the need for crisis management negatively impacted local communities and industries. The eventual implementation of federal regulations led to zero attributable right whale deaths and a profitable fishery in the area of highest whale densities the following year. This shows that government leaders can act effectively on issues of environmental conservation, but that these actions can be drastic (i.e., requiring significant and rapid change to human activities) if there is a historic lack of action to address chronic conservation problems. Being proactive requires acting in proportion to evidence, using plans that are adaptive, precautionary and based on science. Canada must now look to sustainable, preventative measures to reduce right whale mortality risk.