1. Bottom-up participatory processes to create and manage no-take marine protected areas have been proposed as a way to scale-up marine conservation and deal with the lack of support and compliance of top-down conservation approaches. However, bottom-up conservation does not always lead to positive outcomes, thus it is increasingly important to understand the conditions that determine the establishment and implementation of these initiatives.2. Establishment and implementation processes were compared empirically for two contrasting bottom-up no-take marine protected areas that have been developing under the same political setting, however, one has been successful and the other has stalled.3. Using mixed methods, stakeholders' (a) motivations to participate in the no-take marine protected area initiatives, (b) communication, support and information flow networks, (c) perceived participation, and (d) satisfaction with the establishment process of the bottom-up no-take marine protected areas, were assessed. 4. Non-significant differences were found between the two initiatives in terms of stakeholders' motivations to create a no-take marine protected area. 5. Significant differences were found in stakeholders' communication, support and information flow networks, in addition to differences in participation, and satisfaction with the establishment and implementation process.6. Results highlight that for the implementation and consolidation of bottom-up no-take marine protected areas initiatives, common interests do not necessarily lead to common action, partnerships will not emerge automatically in response to potential benefits. 7. Understanding disparities in participation, information sharing and communication are key aspects which must be considered for creating and supporting successful marine protected areas based on bottom-up participatory processes.