The complex nature of many health care interventions poses challenges for successful replication. This article presents insights on tackling these challenges primarily drawn from recent research and programs in the UK. These insights include the need to codify complex interventions in ways that reflect their social, context-sensitive, and dynamic nature; to capture learning as the intervention is implemented in new contexts; and to design programs in ways that respect adopters' role in the spread process. We argue that program leaders should have familiarity with theoretical approaches for conceptualizing complex interventions, that a discrete testing-and-revision phase should be recognized as part of the spread process, and that programs should be designed in ways that build and sustain adopter commitment. These perspectives complement the traditional focus on the innovator in models of spread by highlighting the role adopters play in adapting interventions and generating learning, and they have implications for the design of programs to spread innovation.

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Mussel farming places a benthic organism in a pelagic environment; it is therefore important to understand the driving force that transports the food to the mussels. The hydrodynamic regimes in the sidearms and embayments in Pelorus Sound are dominated by the lunar tide, and a net estuarine circulation in the main channel flowing inwards along the bottom and outwards along the top. Salinity gradients extend throughout the sound from the river inflows, with strongest density stratification in the sidearms and embayments: nearest the head of the sound. There, the water column is separated at the pycnocline into upper and lower layers which tend to M91014

A tank system for culturing rock lobster (Jasus edwardsii) phyllosomas is described. Four tanks, one of which remains empty, are interconnected by ports that allow larvae to be transferred without handling and the vacated tank to be cleaned. Vertical water movement in each tank maintains the larvae in suspension, and the overall design and management allows for feeding with live brine shrimp (Artemia). Mean survival rates of over 60% to Stage VIII have been obtained, but only one puerulus has been reared.