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<p>Understanding the carbon footprint of industrial longline fisheries is essential for developing low-carbon, sustainable deep-sea fishing strategies. This study evaluates vessel-class-specific performance, catch efficiency, and fuel-based carbon emissions on a 20 month’s survey (August 2022–March 2024) of bottom-set shark longliners operating from Thengapattinam Fishing harbour, southwest India. Operational data from 20 fishing cruises were standardized to document gear configuration, spatial effort, species composition, fuel use, and CO₂ emissions. Vessel-class differences were pronounced: Type C (steel) vessels traveled the farthest, while Type A (wooden) vessels achieved the highest soaking-hour CPUE (143.65&#xa0;kg h⁻¹). Based on CPUE standardized to total running hours, Type A vessels performed best (21.13&#xa0;kg h⁻¹), followed by Type C (15.93&#xa0;kg h⁻¹) and Type B (13.02&#xa0;kg h⁻¹). Annual fuel use ranged from 3,599&#xa0;L (Type A) to 6,214&#xa0;L (Type C), corresponding to 14,158–16,717&#xa0;kg CO₂ boat⁻¹ yr⁻¹. Fuel efficiency (0.59&#xa0;L kg⁻¹) and emission intensity (1.59&#xa0;kg CO₂ kg⁻¹) were most favorable for Type A vessels, with intensity increasing by vessel size. One-way and two-way ANOVA confirmed significant differences (<i>p</i> &lt; 0.01) in CPUE, fuel consumption, and CO₂ output among vessel types and operational phases. These findings provide an evidence base for integrating carbon auditing, fleet optimization, and vessel-class-specific fuel management into India’s deep-sea shark fisheries.</p>

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Fuel-Based Carbon Emissions and Comparative Performance of Vessel Classes in Bottom-Set Longline Shark Fisheries off the Southwest Coast of India

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Sethuraj Archana,
  • Neethirajan Neethiselvan,
  • Pandurangan Padmavathy,
  • Thangaraj Ravikumar,
  • Thavasiyandi Umamaheswari,
  • Varatharajan Durai,
  • Esakkimuthu Dineshkumar,
  • Velu Ranjithkumar

摘要

Understanding the carbon footprint of industrial longline fisheries is essential for developing low-carbon, sustainable deep-sea fishing strategies. This study evaluates vessel-class-specific performance, catch efficiency, and fuel-based carbon emissions on a 20 month’s survey (August 2022–March 2024) of bottom-set shark longliners operating from Thengapattinam Fishing harbour, southwest India. Operational data from 20 fishing cruises were standardized to document gear configuration, spatial effort, species composition, fuel use, and CO₂ emissions. Vessel-class differences were pronounced: Type C (steel) vessels traveled the farthest, while Type A (wooden) vessels achieved the highest soaking-hour CPUE (143.65 kg h⁻¹). Based on CPUE standardized to total running hours, Type A vessels performed best (21.13 kg h⁻¹), followed by Type C (15.93 kg h⁻¹) and Type B (13.02 kg h⁻¹). Annual fuel use ranged from 3,599 L (Type A) to 6,214 L (Type C), corresponding to 14,158–16,717 kg CO₂ boat⁻¹ yr⁻¹. Fuel efficiency (0.59 L kg⁻¹) and emission intensity (1.59 kg CO₂ kg⁻¹) were most favorable for Type A vessels, with intensity increasing by vessel size. One-way and two-way ANOVA confirmed significant differences (p < 0.01) in CPUE, fuel consumption, and CO₂ output among vessel types and operational phases. These findings provide an evidence base for integrating carbon auditing, fleet optimization, and vessel-class-specific fuel management into India’s deep-sea shark fisheries.