Swift v. Gifford
Facts
The opinion states that the parties were engaged in the whale fishery and that the dispute concerned ownership of a whale pursued by different vessels. The respondent relied on a long-recognized custom among American whalemen that "the iron holds the whale." Under the relevant part of that usage, the vessel whose crew first struck the whale effectually, so that the iron remained fast while the pursuit continued, had the better right. The libellants' master ultimately yielded the whale in conformity with that custom, but the libellants challenged the custom's legal validity.
Issue
Whether a well-established usage in the whaling industry may govern property rights in a whale, despite the common-law rule that title to a wild animal ordinarily requires actual and complete possession. More specifically, whether the custom giving the better right to the vessel whose crew first struck and held the whale with an iron during continuing pursuit is valid and enforceable.
Rule
Although the common law generally gives no property in a wild animal by mere wounding and requires actual and complete possession, a general and long-established usage of an entire trade may validly vary that rule where the rule's application is uncertain and the custom is reasonable. In the whale fishery, the reasonable and enforceable custom is that the party who first strikes a whale so effectually that the iron remains fast has the better right, so long as the pursuit continues.
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