Unanswered Forum Topics

2022 and 2023 Independent Proof of Concept Testing for the Deepwater Horizon Restoration Project: Reducing Juvenile Sea Turtle Bycatch through Development of Reduced Bar Spacing Turtle Excluder Devices

Study Type
Field study in the wild
Location
Northern Gulf of Mexico (Mississippi, Louisiana)
Target catch
brown shrimp (Farfantepenaeus aztecus), white shrimp (Litopenaeus setiferus)
Effect on bycatch species
Bent bar, bottoming opening TED and straight bar, top opening TED reduced invertebrate bycatch by 56.2% and 28.4% respectively. No impact on sea turtle bycatch.
Effect on target catch
Bent bar, top opening TED reduced shrimp catch by 3.3%, although a low number of shrimp were encountered during the study
Bycatch species
Reduction technique
Fishing Gear

2022 and 2023 Independent Proof of Concept Testing for the Deepwater Horizon Restoration Project: Reducing Juvenile Sea Turtle Bycatch through Development of Reduced Bar Spacing Turtle Excluder Devices

Study Type
Field study in the wild
Location
Northern Gulf of Mexico (Mississippi, Louisiana)
Target catch
brown shrimp (Farfantepenaeus aztecus), white shrimp (Litopenaeus setiferus)
Effect on bycatch species
Bent bar, bottoming opening TED and straight bar, top opening TED reduced invertebrate bycatch by 56.2% and 28.4% respectively. No impact on sea turtle bycatch.
Effect on target catch
Bent bar, top opening TED reduced shrimp catch by 3.3%, although a low number of shrimp were encountered during the study
Bycatch species
Reduction technique
Fishing Gear

2022 and 2023 Independent Proof of Concept Testing for the Deepwater Horizon Restoration Project: Reducing Juvenile Sea Turtle Bycatch through Development of Reduced Bar Spacing Turtle Excluder Devices

Submitted by lweiss on

Turtle excluder device (TEDs) with reduced bar spacing may help to reduce bycatch of small sea turtles that can pass through the deflector bars of standard TEDs. A bent bar top opening TED installed at 55°, a bent bar, bottom opening TED installed at 45°, and straight bar, top opening TED installed at 55° were evaluated. None of the TEDs significantly reduced total catch or bycatch. However, the bent bar, bottom opening TED and straight bar, top opening TED both significantly reduced invertebrate (largely jellyfish) catch. 

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Harnessing solar energy to reduce sea turtle bycatch

Study Type
Field study in the wild
Location
Baja California Sur, Mexico
Target catch
yellowtail amberjack (Seriola dorsalis)
Effect on bycatch species
63% reduction in predicted mean sea turtle bycatch rates
Effect on target catch
No significant difference in catch between illuminated and non-illuminated nets
Bycatch species
Reduction technique
Fishing Gear

Harnessing solar energy to reduce sea turtle bycatch

Study Type
Field study in the wild
Location
Baja California Sur, Mexico
Target catch
yellowtail amberjack (Seriola dorsalis)
Effect on bycatch species
63% reduction in predicted mean sea turtle bycatch rates
Effect on target catch
No significant difference in catch between illuminated and non-illuminated nets
Bycatch species
Reduction technique
Fishing Gear

Harnessing solar energy to reduce sea turtle bycatch

Study Type
Field study in the wild
Location
Baja California Sur, Mexico
Target catch
yellowtail amberjack (Seriola dorsalis)
Effect on bycatch species
63% reduction in predicted mean sea turtle bycatch rates
Effect on target catch
No significant difference in catch between illuminated and non-illuminated nets
Bycatch species
Reduction technique
Fishing Gear

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

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Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

Harnessing solar energy to reduce sea turtle bycatch

Submitted by lweiss on

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.  

Read More

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Study Type
Field study in the wild
Location
South Atlantic Ocean, Indian Ocean
Target catch
Southern bluefin tuna (T. maccoyii), albacore tuna (T. alalunga), yellowfin tuna (T. albacares)
Effect on bycatch species
Unweighted branch lines (control) caught more than twice the number of seabirds compared to weighted branch lines
Effect on target catch
For southern bluefin and yellowfin tuna, no significant effect. For albacore, catch rate significantly decreased
Bycatch species
Reduction technique
Fishing Gear

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Study Type
Field study in the wild
Location
South Atlantic Ocean, Indian Ocean
Target catch
Southern bluefin tuna (T. maccoyii), albacore tuna (T. alalunga), yellowfin tuna (T. albacares)
Effect on bycatch species
Unweighted branch lines (control) caught more than twice the number of seabirds compared to weighted branch lines
Effect on target catch
For southern bluefin and yellowfin tuna, no significant effect. For albacore, catch rate significantly decreased
Bycatch species
Reduction technique
Fishing Gear

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Study Type
Field study in the wild
Location
South Atlantic Ocean, Indian Ocean
Target catch
Southern bluefin tuna (T. maccoyii), albacore tuna (T. alalunga), yellowfin tuna (T. albacares)
Effect on bycatch species
Unweighted branch lines (control) caught more than twice the number of seabirds compared to weighted branch lines
Effect on target catch
For southern bluefin and yellowfin tuna, no significant effect. For albacore, catch rate significantly decreased
Bycatch species
Reduction technique
Fishing Gear

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Submitted by lweiss on

The study tested the effect of Lumo Leads on seabird bycatch and catch rates in the Korean tuna longline fleet. Lumo Leads (previously called "safe leads") add weight to longlines by threading the line through a channel, rather than crimping to the line. This can reduce flyback speed and improve crew safety. Lumo Leads also provide protection from exposure to lead weights, and contain optional fluorescent dye to provide an alternative to single-use glow sticks or electric lights.

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The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Submitted by lweiss on

The study tested the effect of Lumo Leads on seabird bycatch and catch rates in the Korean tuna longline fleet. Lumo Leads (previously called "safe leads") add weight to longlines by threading the line through a channel, rather than crimping to the line. This can reduce flyback speed and improve crew safety. Lumo Leads also provide protection from exposure to lead weights, and contain optional fluorescent dye to provide an alternative to single-use glow sticks or electric lights.

Read More

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Submitted by lweiss on

The study tested the effect of Lumo Leads on seabird bycatch and catch rates in the Korean tuna longline fleet. Lumo Leads (previously called "safe leads") add weight to longlines by threading the line through a channel, rather than crimping to the line. This can reduce flyback speed and improve crew safety. Lumo Leads also provide protection from exposure to lead weights, and contain optional fluorescent dye to provide an alternative to single-use glow sticks or electric lights.

Read More

The experimental trials of line weighting options for reduction of incidental mortality of seabirds in Korean tuna longline vessels

Submitted by lweiss on

The study tested the effect of Lumo Leads on seabird bycatch and catch rates in the Korean tuna longline fleet. Lumo Leads (previously called "safe leads") add weight to longlines by threading the line through a channel, rather than crimping to the line. This can reduce flyback speed and improve crew safety. Lumo Leads also provide protection from exposure to lead weights, and contain optional fluorescent dye to provide an alternative to single-use glow sticks or electric lights.

Read More