Small Cetaceans (maximum length < 7.5 meters)

Displaying 41 - 50 of 80

Study Type: 

Field study in the 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: 

Species: 

Globicephala spp.

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.   

Distribution: 

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

Population: 

Unknown
Photo: Adam Li, NOAA/NMFS/SWFSC

IUCN Status: 

Data Deficient

Type: 

Mammal

Bycatch Threat: 

Longlines, gillnets, purse seines, trawls

Species: 

Pontoporia blainvillei

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

Distribution: 

Mid-coastal Brazil south to mid-coastal Argentina

Population: 

30,000 to 50,000
Photo: YAQU PACHA

IUCN Status: 

Vulnerable

Type: 

Mammal

Bycatch Threat: 

Gillnets

Species: 

Phocoena sinus

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 2019, CIRVA reported that probably only 10 individuals remain of this species, 22 at most. (CIRVA, 2019).

References

CIRVA (V). 2019. Report of the Eleventh Meeting of the 'Comité Internacional para la Recuperación de la Vaquita. NOAA, Southwest Fiheries Science Center, 34pp.

Distribution: 

Northern Gulf of California, Mexico

Population: 

~ 19
Photo: Chris Johnson earthOCEAN www.vaquita.tv

IUCN Status: 

Critically Endangered

Type: 

Mammal

Bycatch Threat: 

Gillnets

Study Type: 

Field study in the wild

Location: 

North Sea

Target catch: 

Cod

Effect on bycatch species: 

Reduced catch rates from 0.00229 and 0.00295 for nets with dummy pingers and no pingers respectively, to 0.00015 for nets with active pingers

Effect on target catch: 

None reported

Article: 

Study Type: 

Field study in the wild

Location: 

Western Australia

Target catch: 

red emperor, scarlet perch, spangled emperor, Rankin cod, blue spot emperor, rosy threadfin brea, flagfish, frypan snapper, red snapper and goldband snapper

Effect on bycatch species: 

Reduced dolphin bycatch by almost 50% and reduced bycatch of sea turtles, large sharks and large rays

Effect on target catch: 

Not reported

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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