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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40777

Title: Seabirds And Sea Turtles Bycatch Of Taiwanese Tuna Longline Fleets In The Pacific Ocean
Authors: Hsiang-Wen Huang
Contributors: 國立臺灣海洋大學:海洋事務與資源管理研究所
Keywords: tuna longline fisheries
sea birds
sea turtles
Date: 2014-08
Issue Date: 2017-02-06T08:21:21Z
Abstract: Abstract: To understand the sea turtle and seabird bycatch of Taiwanese distant water
longline fleets for conservation purposes, this research analyzed the data collected by
observers onboard between 2008 and 2013. In total, the bycatch data from 149 trips
and 24.3 million hooks were collected, including 50 albacore large-scale tuna longline
vessels (LSTLVs) trips, 72 bigeye LSTLVs trips, and 27 small-scale longline
(SSTLVs) trips. The observer coverage rates of LSTLVs varied between 4.70% and
7.95% by year. The seabird bycatch was mostly from albacore LSTLVs, followed by
bigeye LSTLVs but that of the SSTLVs was very low. The highest bycatch rate was
0.318 birds per thousand hooks in the Southwest Pacific Ocean in the first quarter,
followed by the same area in the second quarter (0.046 birds per thousand hooks). For
seabird bycatch species, 82% were albatrosses, including wandering, black-footed
albatrosses; and petrels, shearwaters, and booby. The estimated annual bycatch
numbers ranged from 175 to 381 between 2008 and 2013 for LSTLVs. As for sea
turtles, the bycatch rate of SSTLVs was higher than that of LSTLVs. The major
bycatch species were olive Ridley turtle, followed by green and leatherback turtles.
The sea turtles bycatch rate peaked in the second quarter in the western tropical
Pacific Ocean (0.011 turtles per thousand hooks), followed by the fourth quarter
(0.006 turtles per thousand hooks). The estimated sea turtle bycatch numbers ranged
from 131 to 249 per year between 2008 and 2013 for LSTLVs.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40777
Appears in Collections:[海洋事務與資源管理研究所] 演講及研討會

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