Marine spatial planning (MSP) now has a sufficient history for consideration of the way in which MSP processes are developing over time, gaining experience and responding to issues that arise. Rather than setting a study of this kind in the well-established framework of adaptive management, I choose instead a spatial concept that allows planning action to be more closely meshed with the nature of the marine setting itself, that of Deleuze and Guatarri's notion of striated and smooth spaces. This suggests that there are two different manners in which space is produced, which are interdependent and interchanging and work together in making progress; this has certain resonances with the materiality of the sea. I use this concept in a reading of an MSP process with a relatively long pedigree, that of the Shetland Islands, Scotland, UK, focusing particularly on the development of aquaculture policy, through analysis of a sequence of documents. The study reveals that policy-making is suffused with striated and smooth spatialities, finding expression on the one hand in development criteria and other regulations, and on the other hand, in discretion, negotiation and opportunity-building, with the two yielding to each other and advancing together with their different types of movement. This suggests a more general manner by which MSP processes may progress, by spatial dialectic of this kind, in which those who practice MSP engage through their own reasoning of the natural and human structures and dynamisms of the coasts and seas and their responsive plan-making.

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