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Why are they on the surface there?
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To recover?
To improve digestion in warmer water?
To shake off remora which often cling to them? see pic
Vid was taken on "Hell Hole" a spot located on north east channel.
Probably the only area on the blue planet you may spot the fish on the surface in summer
About 5 to 10 fish every day!
Tagging studies there show they like to swim on the sea surface at regular intervals during the day (about every one hour) then rapidly diving to 600/ 900 feet depth. Best conditions: sea becalmed, 63 C deg. water and full moon....