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Displaying 51 - 56 of 56
Location Gear Catch Technique Bycatch species Type Results

Baja California Sur, Mexico

Gillnets and Entangling Nets
yellowtail amberjack (Seriola dorsalis)
Visual deterrents
Sea Turtles Field study in the wild
Summary:

Solar powered LED lights flashing at a 10% duty cycle (5Hz, 20 min on, 180 mins off) attached to gillnets resulted in a 63% reduction in predicted mean sea turtle bycatch rates. This falls within the range found in previous studies that looked at static lights (40-90% reduction in bycatch), suggesting sea turtle bycatch can be reduced with less power consumption.  

Effect on Bycatch: 63% reduction in predicted mean sea turtle bycatch rates
Reference:
Senko, J.F., Wang, J., Burgher, K.M., Jenkins, L.D., Lue Sang, C., Bailly, M., Cuevas Amador, J.P., Cuevas Amador, F., Bowden, S., Osmond, M., and J. Blain, 2025 , Harnessing solar energy to reduce sea turtle bycatch

Northern Levant Sea, Türkiye

Trawls
Shrimp (Aristaeomorpha foliacea and Aristeus antennatus)
Excluder devices
Bony Fishes, Elasmobranchs, Sea Turtles Field study in the wild
Summary:

40 trial tows investigated the potential of excluder grids in mitigating bycatch in trawl fisheries in the Northern Levant Sea. Tested gear configurations included a flexible grid with 50mm bar spacing and a rigid grid with 95mm spacing within the trawl extension. The excluder grids significantly reduced bycatch of several elasmobranch species including the velvet-belly lanternshark (Etmopterus spinax) and the blackmouth catshark (Galeus melastomus), as well as some species of bony fish. Sea turtle bycatch also appeared to be reduced although in general, sea turtle bycatch during the trials was low (two individuals in the control gear). However, catch performance of target shrimp species (Aristaeomorpha foliacea and Aristeus antennatus) were also reduced in the gear equipped with BRDs, indicating a trade-off. 

 

Effect on Bycatch: Etmopterus spinax - 50 mm grid - bycatch reduced by 45.3%; Galeus melastomus - 50 mm grid - bycatch reduced by 68.8%; Saurida lessepsianus - 95mm grid, bycatch reduced by 86.1%; Upeneus moluccensis - 95 mm grid, bycatch reduced by 28.4%
Reference:
Ersü, C.B., Yeldan, H., Kiyağı, V.B., Saygicak, S., Çınar, M., İşitmez, Y., Uzun, M., Çapkan, S., Dölek, A., and F. Çağlar , 2025 , Reduction and mitigation of the catch of elasmobranchs, sea turtles, and any other vulnerable marine species (e.g. marine mammals) incidentally captured by trawlers along the Turkish coast

Karachi, Pakistan

Gillnets and Entangling Nets
Tuna spp.
Sub-surface sets (gillnets)
Small Cetaceans (maximum length < 7.5 meters), Sea Turtles Field study in the wild
Summary:

The study examined individual and cumulative bycatch during the first five years of a fisher engagement program in the tuna drift gillnet fishery in Pakistan, where fishers co-developed a sub-surface net setting strategy while also receiving bycatch awareness and safe release training. Captain identity and year were the strongest predictors of sea turtle and dolphin bycatch rates.  

Effect on Bycatch: 95% reduction in cumulative dolphin bycatch over four years; 90% reduction in cumulative sea turtle bycatch
Reference:
Roberson, L.A., Razzaque, S.A., Elliott, B., Nawaz, R., Shiekh, A. and Read, A.J., 2026 , Successful fisher-driven reduction of megafauna bycatch in a tuna gillnet fishery

Eastern Pacific Ocean (Ecuador, Panama, Costa Rica fisheries)

Hooks and Lines
Mahi -mahi (Coryphaena hippurus), tunas, billfishes and sharks
Circle hooks
Sea Turtles, Chelonia mydas (Green sea turtle), Lepidochelys olivacea (Olive (Pacific) ridley sea turtle) Field study in the wild
Summary:

An analysis of the performance of circle hooks in comparison to J-style and tuna hooks on the hooking rates of target and non-target species, specifically sea turtles, in the artisanal surface longline fisheries of Ecuador, Panama, and Costa Rica was performed. The target fisheries were mahi-mahi and a combination of tunas, billfishes, and sharks (TBS). In the TBS fishery, tuna hooks were compared to 16/0 circle hooks from Ecuador and Panama and 18/0 circle hooks from Costa Rica. For the mahi-mahi fishery, 14/0 and 15/0 circle hooks in Ecuador and 16/0 circle hooks in Costa Rica were compared to traditional J-style hooks. Circle hooks reduced sea turtle hooking rates in most of the comparisons. Hooking rates for target and non-target species were not consistent.

Effect on Bycatch: Reduced hooking rates in most comparisons

Hawaii, United States

Hooks and Lines
Swordfish, tuna
Deep sets
Sea Turtles, Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) Field study in the wild
Summary:

Fishing experiments were designed to test various gear modifications for the pelagic longline fishery in Hawaii, United States, to reduce sea turtle interactions. The experiments tested (1) daytime "stealth gear" (2) deep daytime setting, and (3) circle hooks combined with hook timers. Stealth gear and deep setting both caught significantly fewer swordfish compared to the control, although overall catch was reduced by 39% using stealth gear and was approximately similar to the control using deep setting. Neither gear configuration resulted in the take of any sea turtles (compared to one turtle in the control). Initial testing of hook timers with circle hooks resulted in the catch of two sea turtles. Circle hooks were also 40% as effective as J hooks at catching swordfish, and 94% as effective at catching tuna (by weight and value). 

Effect on Bycatch: Low capture rates in both control and treatment
Reference:
Boggs, C.H., 2003 , Annual Report on the Hawaii Longline Fishing Experiments to Reduce Sea Turtle Bycatch under ESA Section 10 Permit 1303

Hawaii, United States

Hooks and Lines
Swordfish, tuna
Circle hooks
Sea Turtles, Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) Field study in the wild
Summary:

Fishing experiments were designed to test various gear modifications for the pelagic longline fishery in Hawaii, United States, to reduce sea turtle interactions. The experiments tested (1) daytime "stealth gear" (2) deep daytime setting, and (3) circle hooks combined with hook timers. Stealth gear and deep setting both caught significantly fewer swordfish compared to the control, although overall catch was reduced by 39% using stealth gear and was approximately similar to the control using deep setting. Neither gear configuration resulted in the take of any sea turtles (compared to one turtle in the control). Initial testing of hook timers with circle hooks resulted in the catch of two sea turtles. Circle hooks were also 40% as effective as J hooks at catching swordfish, and 94% as effective at catching tuna (by weight and value). 

Effect on Bycatch: Low capture rates in both control and treatment
Reference:
Boggs, C.H., 2003 , Annual Report on the Hawaii Longline Fishing Experiments to Reduce Sea Turtle Bycatch under ESA Section 10 Permit 1303

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