Estimating Cetacean Bycatch from Tuna Gillnet Fisheries in Sri Lanka, Pakistan and India
Abstract
The Indian Ocean is the second-largest tuna production area in the world and provides
important economic benefits to global fishery markets. However, bycatch is a major
issue for tuna fisheries in this area, particularly for interactions between drift
gillnets and several species of cetaceans. The issue is particularly acute in the
Arabian Sea (northwestern Indian Ocean), where drift gillnets are the primary fishing
method used by most countries. However, development of effective bycatch reduction
strategies is hampered by a lack of data about fishing effort and bycatch in this
region. The present study employed a systematic literature review to develop a coarse
estimate of cetacean bycatch, using data collected during port surveys and from observer
programs for the three largest tuna drift gillnet countries: Sri Lanka, India and
Pakistan, during the period from 1984 to 2019. Cumulative estimates of bycatch increased
over this period, driven by increasing tuna captures over time. The study provides
only a coarse estimate of bycatch, with many uncertainties associated with the extrapolations,
but the magnitude of bycatch is large enough to warrant immediate management action.
Current information needs in the Arabian Sea include better information on fishing
effort, such as from the use of electronic monitoring systems on fishing vessels,
and tests of bycatch mitigation technology, such as net illumination. However, funding
for such ventures is inadequate and the scientific capacity of countries around Arabian
Sea is limited. This study provides three recommendations to address this situation:
1) identify priority bycatch areas in each country, and conduct a rapid bycatch assessment
in those areas; 2) strengthen cooperation between national governments and international
organizations, such as the IOTC and IWC, to address bycatch in the region; and 3)
focus research on bycatch mitigation strategies.
Type
Master's projectPermalink
https://hdl.handle.net/10161/22661Citation
Fang, Yutian (2021). Estimating Cetacean Bycatch from Tuna Gillnet Fisheries in Sri Lanka, Pakistan and
India. Master's project, Duke University. Retrieved from https://hdl.handle.net/10161/22661.Collections
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