 The juveniles generally stay in water less than deep, with the youngest sharks spending the most time in the shallowest parts of the bay.They swim into the intertidal zone with the rising tide and depart as the tide recedes; this movement may relate to exploiting foraging opportunities on the submerged mud flats, or to avoiding predation or competition by staying out of the deeper waters occupied by larger sharks.There is also an annual movement cycle where the juveniles move closer to the river mouths during the dry season and farther from them during the wet season; since the rainy season brings a higher flow of fresh water into the bay, the sharks may be responding directly or indirectly to the resultant decrease in salinity and dissolved oxygen levels.