This study examines changes over 4 years in inter-firm cooperation and social networks in Chile's salmon farming cluster. It finds that while access to skilled labor and joint product development intensified, most dimensions of cooperation did not significantly change or decreased over time. Contrary to expectations, firms acted more individualistically in areas impacting competitive advantage. Overall cooperation trends less rather than more, despite literature highlighting benefits. Lessons include the need for trade associations to facilitate informal social interactions to potentially foster further cooperation.