Bycatch Loggerhead Satellite Tagged

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3/24/2025
Update of tracks for 581 and 583 after 78 days at sea.

581 has become entrained in the strong north-northwest flowing Kuroshio current running and ~3 kts/h.  Turtle 583 is just about to enter the Kuroshio current also... we will see if 583 begins to move northwest also.

3/6/2025
Loggerhead turtles 381 and 583 continue to transmit after 60 days.  They have moved into the same general area (see map).  Below are two graphs showing the SST that the turtles have experienced during their travels.
I have created an overlay of Chlorophyll a concentrations on the tracks of 581 and 583 and note that they are in relatively productive waters at this time.




SST for turtle number 581.

SST for turtle 583


2/13/2025

Turtles 581 and 583 continue to transmit after 39 days at sea.  581 has followed the meandering Kuroshio current to the north while 583 has broken out of the Kuroshio current and headed to the south.  Both remain in waters that are 19 to 22 degrees C.

Turtles 581 and 583 are following a similar path moving along the main Kuroshio currents.
Above are tracks for turtles 581 and 583 up through 1/24/2025 on the general current pattern off of the coast of Japan.



Below is a chart showing the track and locations of turtles 571, 580, 581 & 583 since their release.  This map is automatically updated daily.

  

1/6/2025

Tomomi Saito and his research team from Usa Marine 'Biological Institute, Kochi University have release 2 more loggerheads captured as by-catch at Moroto Point in Japan.  


About noon of 06 Jan. 2025, released them off Tosa Bay (33°13'00.0"N 133°40'00.0"E). 


13/12/2024 Bycatch at Shiina Fishing Port, Muroto-shi, Kochi Pref.
SCL: 82.7 cm, SCW: 67.0 cm, BM: 78.5 kg
Left forelimb tag: JP30791-A, left hindlimb tag: JP40193-A 
PTT Transmitter ID: 265581
PIT Tag ID: 392145000262151


27/12/2024 Bycatch at Shiina Fishing Port, Muroto-shi, Kochi Pref.
SCL: 73.1 cm, SCW: 59.8 cm, BM: 55.5 kg
Left hindlimb tag: JP40196-A
PTT Transmitter ID: 265583

PIT Tag ID: 392145000261239

1/2/2025

Below is a short clip of the location of turtle 580 as of Jan 2, 2025.


12/31/2024

Below is a short clip of the location of turtle 580 on New Year's Eve.



12/28/2024









12/19/2024


Turtle number 580 has become entrained in the easterly flow of the Kuroshio Current and is moving southeasterly in waters that are 21-23 degrees C.  Below is an animation of the current flow that 580 is currently in.




12/13/2024

Turtle 580 continues to move to the southeast in waters that are approximately 22 degrees C.  Based on the track for the couple of days, 580 may have found an area where there is some forage items.. it is wandering in a localized area.

Above is a chart of 580's track since release showing that 580 may have found some forage as it is remaining in a small area.


12/08/2024

Dr. Tomomi Saito and his team from the Usa Marine Biological Institute, Kochi University have tagged and released a sub-adult loggerhead turtle that was caught by fishermen at Shiina Fishing Port.  The turtle was healthy and in good condition as it was released off of a fishing boat in Usa Bay.  Below are the specifics and biometrics for the turtle.

Congratulations to the Usa Research Team!

Information about turtle 580.

6/12/2024 Bycatch at Shiina Fishing Port, Muroto-shi, Kochi Pref.
SCL: 70.1 cm, SCW: 57.7 cm, BM: 54.5 kg
Left forelimb tag: JP40191A, left hindlimb tag: JP40192A 
PTT Transmitter ID: 265580 
PIT Tag ID: 392145000261749

 

Turtle 580's track post release on 12/08/2024. Map is updated daily.



 Satellite tag is attached and protected on the front by a "bumper".


Turtle 580 is ready for release and is about to go over the side of the fishing vessel.

Waving goodby and wishing good luck to 580!






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