(blue line=night movements, yellow line=day movements)

Fig. 1:

The small juveniles remained all the time close to the shore in the North Bay. Although they moved throw the entire bay, in one particular 24 hour tracking period they stayed in a confined area. These areas could be used as nursery grounds where the juveniles spend their first weeks, months or years and they found plenty of food.

Juvenile swimming pattern

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Fig. 2:

Both juveniles were in the upper waters more than adults staying above the 50 m depth most of the time. During the night the juveniles showed shallow excursions that could be related to feeding.

Fig. 3:

There are different potential preys that perform nocturnal migrations to the surface like squid, mackerels, flying fish and sardines. We found several eagle rays that would be their potential preys in the specific areas they remained for 24 hrs.

Fig. 4:

Also their temperature preferences showed a narrower range than adults staying most of the time between 19-21 °C waters. Small sharks could loose more heat because of their larger surface area to volume ratio compared with bigger sharks.