At Dunstaffnage Marine Laboratory we are using a variety of video techniques to study the Predator-prey Interactions in Shallow Coastal Environments (PISCES). Field experiments use underwater video with infra-red illumination and time-lapse recording to reveal the tidal and diurnal migrations of fish on sandy beaches and rocky reefs. Laboratory experiments have combined high speed video (400 fps) recording with monitoring of physiological signals and sound to investigate escape and schooling behaviour. An infra-red dark-field video technique has also been developed allowing observation of fish larval behaviour in situ within culture tanks; variations in swimming behaviour have been correlated with growth rates of individuals. In other experiments a video "Spatial Actograph" utilises a computer and frame store card to log activity by time and location within an experimental arena to study habitat selection and responses to environmental gradients. This technique is particularly useful in situations with poor contrast - benthic fish that are camouflaged against a sandy substratum.