Table 1. Criteria description.

Category	Definition
Probably living	Distinct to moderate three-dimensional shell structure
	Nuanced colouration
	Two visible shells with a small gap.
Possibly living	Slightly worn shells with some shell structure
	Less nuanced colouration
Dead	Single shells
	Two visible shells with a large gap
	Significantly worn shells without structure
	White or bright shells

Description of criteria for distinguishing between probably living, possibly living and dead Ostrea edulis in video-sequences.