Small Cetaceans (maximum length < 7.5 meters)

Displaying 31 - 40 of 80

Study Type: 

Field study in the wild

Location: 

Australia

Target catch: 

Albacore tuna, yellowfin tuna, mahi mahi

Effect on bycatch species: 

No cetaceans were caught on experimental lines

Effect on target catch: 

No effect

Article: 

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Species: 

Platanista gangetica

The South Asian river dolphin is divided into two subspecies, one inhabiting the Indus River of Pakistan (Indus River dolphin - Platanista gangetica minor) and the other the Ganges and associated river systems in India and Nepal (Ganges River dolphin - Platanista gangetica gangetica); a subpopulation of P. gangetica gangetica is also found in the Karnaphuli and Sangu Rivers of Bangladesh. Ganges River dolphins reside in the Sundarbans mangrove forest (India and Bangladesh) as well.

Distribution: 

Indus River, Ganges-Brahmaputra-Meghna, and Karnaphule-Sangu river systems of the Indian subcontinent

Population: 

Low thousands

IUCN Status: 

Endangered

Type: 

Mammal

Bycatch Threat: 

Gillnets, longlines

Species: 

Orcaella brevirostris

The principal threat to the Irrawaddy dolphin throughout much of its range is accidental entanglement in gillnets (Smith et al 2007). Freshwater populations of the species are at the most risk, particularly those inhabiting the Mekong River (Cambodia, Lao PDR, Vietnam), the Mahakam River (Indonesia), the Ayeyarwaddy River (Myanmar), and lakes Chilika (India) and Songkhla (Thailand). These areas are considered high-use habitat due to their biological productivity, and there is frequently overlap between dolphin populations and gillnet fisheries (Smith et al 2006).

Distribution: 

Estuarine and freshwater habitats of the tropical and subtropical Indo-Pacific; also found in coastal waters of this region

Population: 

Decreasing

IUCN Status: 

Vulnerable, with five Critically Endangered subpopulations

Type: 

Mammal

Bycatch Threat: 

Gillnets, driftnets

Species: 

Cephalorhynchus eutropia

Historically, the Chilean dolphin has been hunted both for food and for crab bait (Reeves et al 2008). Although cetaceans are now protected by law in Chile (Torres et al 1979), regulation enforcement is virtually nonexistent and temptation is high for impoverished fishermen to supplement their income by killing dolphins for bait (Dawson 2009; Reeves et al 2008).

Distribution: 

Along the Chilean coast in cold, shallow waters; sometimes enters rivers & estuaries

Population: 

Low thousands
Photo: Sonja Heinrich

IUCN Status: 

Near Threatened

Type: 

Mammal

Bycatch Threat: 

Gillnets, anti-predator nets, pots and traps

Study Type: 

Field study in the 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: 

Study Type: 

Field study in the 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: 

Study Type: 

Field study in the 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: 

Study Type: 

Field study in the 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

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