 Marine protected area, MPA, monitoring has become increasingly important in order to ensure that conservation goals are met. Non-extractive monitoring techniques offer a range of advantages over traditional extractive sampling methods, including reduced costs, minimal disturbance to the environment, and improved accuracy. This paper reviews the current state of these techniques, discussing their capabilities, applications, advantages, limitations, and potential future developments. This article was authored by Ryan McKeity, Ryan McKeity, Robert Mrenia, and others.