Thirteen fishermen (plaintiffs) operating jointly on a share basis at Simonstown observed a shoal of fish travelling toward Glencairn on 9 September 1919. Both the plaintiffs and fourteen defendants launched their boats to intercept the fish. After an unsuccessful attempt at Klein Fish Hoek, the plaintiffs reached Kamartje beach first and laid their fishing line ashore, waiting for the shoal. The defendants' boat had been delayed by wire from the stranded steamer 'Clan Stuart'. When the defendants arrived, they laid their line directly in front of the plaintiffs' line, so close that the boat oars overlapped and the plaintiffs could not even deploy their net. The defendants intercepted and caught the entire shoal. The plaintiffs claimed £32 4s. as compensation, relying on a local custom among fishermen that once a party has set their lines on a free beach (a beach where no boats are permanently stationed) to catch a shoal of fish seen travelling along the coast, no other fishermen are entitled to set a line in front of theirs within a reasonable distance.
Appeal dismissed with costs. The Resident Magistrate's judgment awarding the plaintiffs £32 4s. (the value of the intercepted catch) was affirmed by the Appellate Division, all judges concurring.
This is one of the leading South African cases on the requirements for proving a valid custom as a source of law. It established comprehensive jurisprudence on custom proof and validation, clarifying that four elements must be demonstrated: ancient origin, reasonableness, uniform observation, and certainty. The judgment is significant for its systematic comparative analysis of Roman-Dutch and English authorities on custom, finding no substantial difference between the two legal traditions. It also advanced the important proposition that long-standing, reasonable, uniformly observed practices deserve legal protection even though they restrict common-law rights, and that proof of enforcement is not required to establish a negative custom. The case remains a standard reference in South African law courses when discussing sources of law and the role of custom in the legal system.