Small Cetaceans (maximum length < 7.5 meters)

Field Study 730

Study Type: 

wild

Location: 

Chilean Patagonia

Target catch: 

Patagonian toothfish

Effect on bycatch species: 

Significantly reduced depredation and interactions with longlines

Effect on target catch: 

CPUE was higher

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 718

Study Type: 

wild

Location: 

Cornwall

Target catch: 

Monkfish

Effect on bycatch species: 

One incidentally caught harbor porpoise; significant reduction in the number of porpoise clicks at nets with pingers. Pinger effects stronger at quiet sites; no habituation observed, exclusion of porpoises following pinger use for as much as 7 hrs

Effect on target catch: 

None reported

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 711

Study Type: 

wild

Location: 

Southwest England

Target catch: 

None reported

Effect on bycatch species: 

DDD's caught significantly fewer porpoises but no significant difference in dolphin bycatch was observed

Effect on target catch: 

None reported

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 709

Study Type: 

wild

Location: 

Seychelles

Target catch: 

Tunas and swordfish

Effect on bycatch species: 

Sock DMD did not affect depredation. Shark depredation was higher

Effect on target catch: 

Sock DMD did not affect catch rates of target species

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 561

Study Type: 

wild

Location: 

Baltic

Target catch: 

None reported

Effect on bycatch species: 

Pingers significantly reduced echolocation encounter rates by 50-100% at 500m; sighting reduced up to 375m. Porpoise return time was 6 hrs when pingers were silent after being active for 24 hrs 50 min

Effect on target catch: 

None reported

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Pilot Whales

Species: 

Globicephala spp.
Photo: Adam Li, NOAA/NMFS/SWFSC
Photo: Adam Li, NOAA/NMFS/SWFSC

Type: 

Mammal

Distribution: 

Short-finned pilot whales are circumglobal in temperate and tropical waters. Long-finned pilot whales occur in temperate and polar waters.

Population: 

Unknown

Bycatch Threat: 

Longlines, gillnets, purse seines, trawls

IUCN Status: 

Data Deficient

Bycatch of pilot whales (short-finned) occurs in the pelagic longline fisheries targeting swordfish, tuna, and shark in the U.S. Mid-Atlantic.  There are also records of pilot whales (long and short-finned) being taken in gillnet, trawl, and purse seine fisheries. "Whale-safe" hooks are being tested in the longline fishery that aim to reduce pilot whale bycatch by allowing whales to straighten the hook, while being strong enough to retain target catch.   

Franciscana

Species: 

Pontoporia blainvillei
Photo: YAQU PACHA
Photo: YAQU PACHA

Type: 

Mammal

Distribution: 

Mid-coastal Brazil south to mid-coastal Argentina

Population: 

30,000 to 50,000

Bycatch Threat: 

Gillnets

IUCN Status: 

Vulnerable

The main threat to the franciscana is bycatch in gillnet fisheries in its native coastal waters of Argentina, Brazil, and Uruguay.   

Vaquita

Species: 

Phocoena sinus
Photo: Chris Johnson earthOCEAN www.vaquita.tv
Photo: Chris Johnson earthOCEAN www.vaquita.tv

Type: 

Mammal

Distribution: 

Northern Gulf of California, Mexico

Population: 

~ 30

Bycatch Threat: 

Gillnets

IUCN Status: 

Critically Endangered

Gillnet fisheries pose the greatest threat to the vaquita population. Current bycatch estimates are unavailable, but in the early 1990s an estimated 39 to 84 individuals were caught by fishermen from one town (D'Agrosa et al 2000).  In 2014, CIRVA reported that probably only 100 individuals remain of this species, and the population was projected to continue declining without emergency regulatory action by the Mexican government (CIRVA, 2014).

References

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