Vol. 58, 2019
(update: 2019.12.6; 12.19)
Twenty-three Years of Sea
Turtle Stranding/bycatch Research in Taiwan
Cheng*, Hua-Yan Wang, Wen-Yi Hsieh, and Yin-Ting Chan
of Marine Biology, National Taiwan Ocean University, Keelung 20224,
Taiwan. *Correspondence: firstname.lastname@example.org
Received 30 April 2019 / Accepted 4 December 2019
Communicated by Benny K.K. Chan
Coastal sea turtle stranding and
bycatch are common phenomena worldwide and have received more attention
in recent years. They are caused by both natural and anthropogenic
factors. One thousand and seventy-two turtles were reported to be
victims of these phenomena from March 1997 to November 2019 in Taiwan.
Number of stranding/bycatch were variable and infrequent for the first
14 years, but increased
each year after 2012 and peaked in 2019 with 217 cases. Most turtles
were juveniles to subadults. All five of Taiwan’s species were reported
in stranding and bycatch records, and the green turtle was reported the
most common. The main reported seasons lasted from winter to spring,
when the weather changes dramatically. The sex ratio (female: male)
ranged from 7 in the hawksbill turtle to 0.7 in the olive ridley, with
an average of 2.4 for all species. Green turtles were the dominant
stranded species, and more loggerhead turtles were by-caught. The
hotspots were the towns of Dougou and Tochen in Yilan County, and
Gongliao District in New Taipei City, located in NE coast of Taiwan
respectively. Stranding was the more common of the two phenomena
reported, and 80% of all stranded turtles were subadult green turtles.
of all stranded/bycaught turtles were dead. Pond-nets were the fishing
gear that accounted for the most bycatch, and captured mainly living
young and subadult green turtles as well as subadult loggerhead
turtles. The hotspots for bycatch were the towns of Dongou and Tochen
in Yilan County. The Coast Guard and concerned citizen were the main
sources of reports. This is the first study to analyze the long-term
stranding/bycatch of sea turtles in Taiwan.
Stranding and bycatch, Green turtle, Temporal and spatial distribution,
Report type, Bycatch type, Gender, Juvenile to subadult turtles.
Cheng CI, Wang HY, Hsieh WY, Chan YT. 2019. Twenty-three years of sea
turtle stranding/bycatch research in Taiwan. Zool Stud 58:44. doi:10.6620/ZS.2019.58-44.