The term "fair game on the high seas" refers to the idea that certain activities or behaviors were considered permissible or allowed in international waters, beyond the jurisdiction of any particular country. Historically, this concept has been associated with the freedom of the seas and the idea that certain actions were considered acceptable in the absence of specific laws or regulations. However, it is important to note that the concept of "fair game" has significantly evolved and is subject to various legal frameworks and international agreements.

In the past, the phrase "fair game on the high seas" could refer to activities such as:

1. Piracy: Before the establishment of strong international maritime laws, piracy was considered fair game in certain areas, particularly during certain periods in history.

2. Slave Trade: Historically, the slave trade occurred on the high seas and was considered "fair game" by some individuals and nations, despite growing opposition and eventual abolition.

3. Whaling: Commercial whaling was permitted in international waters, where whalers could hunt whales without significant legal restrictions.

4. Fishing: Fishing in international waters was considered fair game, subject to customary international law and later agreements on fisheries management.

5. Privateering: In some periods, private individuals were authorized by governments to engage in privateering, which involved attacking enemy ships or engaging in acts of war under a commission or letter of marque.

However, it is crucial to understand that the concept of "fair game" has undergone significant changes and limitations in modern times. International law, including the United Nations Convention on the Law of the Sea (UNCLOS), has established comprehensive frameworks and regulations governing activities in international waters. Piracy, slave trade, and unregulated fishing are now considered illegal under international law and subject to prosecution.

In addition, the notion of "fair game" has become increasingly restricted due to concerns over environmental protection, conservation of marine resources, and the establishment of exclusive economic zones (EEZs) by coastal states. These developments have led to the establishment of clear boundaries, regulations, and responsibilities for various activities in international waters, ensuring a more orderly and sustainable use of the oceans.