Striped Marlin Size of Maturity Study Recent data shows a troubling decline in the average size of these striped marlin off Cabo San Lucas, Mexico — a signal that greater conservation measures may be needed. The IGFA has stepped in to help find answers and ensure that this iconic fishery is healthy for generations to come. Striped Marlin Genetic Study Striped marlin are an iconic billfish facing population declines throughout their range. The IGFA is advancing state-of-the-art genetic research in the Pacific to improve stock assessments and management initiatives for the long-term conservation of striped marlin for future generations.