Sea Turtles

Sea turtle bycatch in tuna fisheries occurs in several ways, through hooking on longlines, entanglement in longlines, gillnets and purse seine FAD netting (both above and below the waterline), and they are sometimes encircled in purse seine nets. Successful bycatch mitigation techniques for longlines include replacing squid with fish bait, using circle hooks with a moderate (<100) offset, deep setting, reducing daylight soak duration, limiting retrieval during daylight hours, and dynamic spatial and temporal measures (e.g. TurtleWatch). For gillnets, net illumination is effective. Improved FAD designs, i.e., biodegradable and non-entangling, are being tested for their potential to reduce bycatch. Utilisation of safe handling and release techniques successfully improves post-release survival, for all gear types.

SeaLlifeBase is a source of biological and distribution data for sea turtle species. Well illustrated species profiles can be found in the 'Marine Turtles of the Maldives'  (green, hawksbill, olive ridley, loggerhead and leatherback turtles). NOAA's 'Find a Species - Sea Turtles' has information on protection status, biology and population status, distribution, threats, conservation measures and research. Locate handy Species ID guides here.

 

Species

3-Alpha Code Name Scientific Name
DKK LEATHERBACK TURTLE Dermochelys coriacea (new FAO)
FBT FLATBACK TURTLE Natator depressus
KEZ EASTERN PACIFIC GREEN TURTLE Chelonia agassizii
LEO OLIVE RIDLEY TURTLE Lepidochelys olivacea
LKV OLIVE RIDLEY TURTLE Lepidochelys olivacea (new FAO
LTB LEATHERBACK TURTLE Dermochelys coriacea
NAD FLATBACK TURTLE Natator depressus
TTH HAWKSBILL TURTLE Eretmochelys imbricata
TTL LOGGERHEAD TURTLE Caretta caretta
TTX MARINE TURTLES NEI Testudinata
TUG GREEN TURTLE Chelonia mydas