Quantifying the effect of trolling speeds on catch composition, CPUE, and fuel consumption in Teluk Tamiang, Indonesia
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Trolling speed is an operational factor that can influence catch performance and fuel use in small-scale pelagic fisheries, yet its quantitative effects remain insufficiently documented in Indonesian waters. This study evaluated the influence of towing speed on catch composition, catch per unit effort (CPUE), and fuel consumption during trolling operations in Teluk Tamiang, Indonesia. A total of 32 fishing operations were conducted at two towing speeds (4 and 8 knots), each repeated 16 times, resulting in 264 fish dominated by narrow-barred Spanish mackerel (Scomberomorus commerson), trevally (Caranx tille), and barracuda (Sphyraena jello). Although total biomass did not differ significantly between speeds, species-specific responses were evident: faster towing favored highly active predators such as mackerel, whereas slower speeds attracted opportunistic feeders, including trevally and barracuda. Mean CPUE at 8 knots (5.45 kg trip?¹) was approximately 1.5 times higher than at 4 knots (3.62 kg trip?¹) and improved distance-based fuel efficiency; however, it required 35-40% higher hourly fuel consumption. Conversely, the lower speed produced smaller catches but greater catch-per-liter efficiency, indicating clear trade-offs between fishing performance and fuel use. These findings highlight towing-speed optimization as a practical operational strategy for balancing catch productivity and energy efficiency in small-scale trolling fisheries.
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