Fig 1.
Observed effort and number of sea turtle bycatch distribution by species in 5*5-degree grid from 2002 to 2013 in all Taiwanese fleets.
Table 1.
Observed number of sets, efforts, total number of efforts and observer coverage rates for the Taiwanese longline fleet in the Atlantic Ocean from 2002 to 2013.
Table 2.
Number of observed hooks, captures and BPUE (bycatch per unit effort) per area and quarter of the Taiwanese longline fleet in the Atlantic Ocean between 2002 and 2013.
Table 3.
Number and percentage of bycatch turtles by onboard status for each species in the Atlantic Ocean from 2002 to 2013.
The high percentage of unknown data points is due, in part, to the fact that many turtles were discarded before being brought onboard due to larger size and other reasons.
Table 4.
Number and percentage of bycatch reason for each species in the Atlantic Ocean from 2002 to 2013.
The high percentage of unknown data points is due, in part, to the fact that the manner of bycatch was not recorded before 2010, and many turtles were discarded before being brought onboard due to larger size and other reasons.
Table 5.
Number and percentage of bycatch gender for each species in the Atlantic Ocean from 2002 to 2013.
The high percentage of unknown data points is due, in part, to the fact that many turtles were discarded before being brought onboard due to larger size and other reasons.
Fig 2.
Catch percentage for three major bycatch turtle species and total observed effort relative to sea surface temperature.
Fig 3.
Curved carapace length (CCL) of three major sea turtles caught in Taiwanese longline fishery, (A) Leatherback; (B) Olive ridley; (C) Loggerhead.
These are the distributions for those measured onboard. Some larger leatherbacks could not be measured because they were released before being placed onboard.
Fig 4.
Distribution of leatherback turtle (Dermochelys coriacea) bycatch in the Atlantic Ocean by quarter.
(A) January to March, (B) April to June, (C) July to September, (D) October to December. Juveniles are labeled by green points and adults are labeled by red points. The distribution Regional Management Unit (RMU, in yellow) is defined in accordance to [22]. The data was downloaded from the OBIS-SEAMAP/SWOT website (http://seamap.env.duke.edu/swot, [23–24]).
Fig 5.
Distribution of olive ridley turtle (Lepidochelys olivacea) bycatch in the Atlantic Ocean by quarter.
(A) January to March, (B) April to June, (C) July to September, (D) October to December. The distribution Regional Management Unit (RMU, in yellow) is defined in accordance to [22]. The data were downloaded from the OBIS-SEAMAP/SWOT website (http://seamap.env.duke.edu/swot, [23–24]).
Fig 6.
Distribution of loggerhead (Caretta caretta, CC) bycatch in the Atlantic Ocean by quarter.
(A) January to March, (B) April to June, (C) July to September, (D) October to December. The distribution Regional Management Unit (RMU, in yellow area) is defined in accordance to [22]. The data were downloaded from the OBIS-SEAMAP/SWOT website (http://seamap.env.duke.edu/swot, [23–24]).
Fig 7.
Distribution of bycatch of other turtles in the Atlantic Ocean by quarter.
(A) January to March, (B) April to June, (C) July to September, (D) October to December.