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Cetacean bycatch in Indian Ocean tuna gillnet fisheries

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Title Cetacean bycatch in Indian Ocean tuna gillnet fisheries
Not Available
 
Creator Herrera,Miguel
Ilangakoon,Anoukchika D
Koya,Mohammed
Moazzam Khan,Muhammad
Mustika,Putu L
Sutaria,Dipani N
Anderson,Charles A
 
Subject Bycatch
Gillnet
Driftnet
Dolphin
 
Description Not Available
Pelagic gillnet (driftnet) fisheries account for some 34% of Indian Ocean tuna
catches. We combined published results from 10 bycatch sampling programmes (1981−2016) in
Australia, Sri Lanka, India and Pakistan to estimate bycatch rates for cetaceans across all Indian
Ocean tuna gillnet fisheries. Estimated cetacean bycatch peaked at almost 100 000 ind. yr−1 during
2004−2006, but has declined by over 15% since then, despite an increase in tuna gillnet fishing
effort. These fisheries caught an estimated cumulative total of 4.1 million small cetaceans between
1950 and 2018. These bycatch estimates take little or no account of cetaceans caught by gillnet but
not landed, of delayed mortality or sub-lethal impacts on cetaceans (especially whales) that
escape from gillnets, of mortality associated with ghost nets, of harpoon catches made from gillnetters, or of mortality from other tuna fisheries. Total cetacean mortality from Indian Ocean tuna
fisheries may therefore be substantially higher than estimated here. Declining cetacean bycatch
rates suggest that such levels of mortality are not sustainable. Indeed, mean small cetacean abundance may currently be 13% of pre-fishery levels. None of these estimates are precise, but they
do demonstrate the likely order of magnitude of the issue. Countries with the largest current gillnet catches of tuna, and thus the ones likely to have the largest cetacean bycatch are (in order):
Iran, Indonesia, India, Sri Lanka, Pakistan, Oman, Yemen, UAE and Tanzania. These 9 countries
together may account for roughly 96% of all cetacean bycatch from tuna gillnet fisheries across
the Indian Ocean.
Not Available
 
Date 2021-09-18T04:35:50Z
2021-09-18T04:35:50Z
2020
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/64356
 
Language English
 
Relation Not Available
 
Publisher Not Available