Pelagic purse-seine fishing vessels. Outside CII scope; per-kg-catch intensity - much lower than trawlers (~0.3–1.0 kg CO₂/kg pelagic catch).
Formula
$$ \text{CO}_2^\text{year} = \sum_j F_j \cdot C_{f,j} $$$$ \\text{Intensity} = \\frac{\\text{CO}_2^\\text{year}}{m_\\text{catch}} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_j$ | Mass of fuel $j$ | t | bunker log |
| $C_{f,j}$ | CO₂ factor | t CO₂ / t fuel | MEPC.364(79) |
| $Bench (Annual catch)$ | operational benchmark | t | operations log |
| $d_\text{op}$ | Operating days | d | operations log |
Tuna seiners in the WCPFC fishery typically post 0.5–0.8 kg CO₂ per kg catch. Helicopter-assisted FAD fisheries add ~10–15 % to the intensity.
Sources
- WCPFC - Western Central Pacific Fisheries Commission.
- IMO MEPC.364(79) - Cf conversion factors.