Spatio-temporal patterns of the Peruvian tuna purse-seine fishery
Published:
Scientific question
How have catch, effort, operational behaviour, fishing modes, and species composition changed in the Peruvian tuna purse-seine fishery, and how are these patterns related to environmental variability?
Data
The project uses fishing logbooks, trip and set information, vessel characteristics, catch composition, size data, fishing-mode classifications, and environmental covariates inside and outside the Peruvian exclusive economic zone.
Methods
- Descriptive analysis of catch, effort, and nominal CPUE.
- Spatial grids, centres of gravity, distributional indices, and hotspot analysis.
- Comparisons among fishing modes and fleet segments.
- Standardized CPUE using generalized, mixed, additive, and spatio-temporal models.
- Blocked spatial and temporal cross-validation.
- Environmental association and habitat modelling.
Current status
Active thesis and publication programme. One component focuses on the historical and operational characterization of the fishery, while a second develops standardized abundance indices and environmental models.
Expected outputs
- Fishery-characterization manuscript.
- Standardized-CPUE manuscript.
- Spatial products and reproducible analytical workflows.
- Methodological guidance for a multispecies and multimodal fishery.
Relevance
The work supports a clearer interpretation of fishery-dependent indicators when fishing modes, target species, vessel characteristics, and spatial coverage vary through time.