Bottom and pelagic trawlers. Outside CII scope; benchmarked per kg of landed catch - fuel-intensive fisheries (prawn, demersal) sit 3–5 kg CO₂/kg catch; pelagic fisheries 0.5–1.5 kg/kg.
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 |
FAO Fisheries publishes global fuel intensity by gear type. Bottom trawling is ~5× more fuel-intensive than pelagic seining for the same catch mass.
Sources
- FAO - Fuel use in the fishing fleet.
- IMO MEPC.364(79) - Cf conversion factors.