Homing and daytime tidal movements of juvenile snappers (Lutjanidae) between shallow-water nursery habitats in Zanzibar, western Indian Ocean

    loading  Checking for direct PDF access through Ovid

Abstract

Synopsis

We studied daily tidal movements of tagged juvenile Lutjanus fulviflamma and Lutjanus ehrenbergii between two adjacent habitats, a subtidal channel and shallow tidal notches in the fossil reef terrace, in a shallow marine bay on Zanzibar Island (Tanzania). Due to a large tidal range, the notches were dry at low-tide and were only accessible to the snappers at high-tide. Of the resighted individuals, 48% showed clear movement between the two habitats, orientated in a direction perpendicular to the tidal currents. Individuals resighted more than once showed site fidelity, indicating homing in both the channel and the notches. We suggest that a significant part of this population of juvenile snappers may move from a low-tide resting habitat to a high-tide resting habitat during the daytime, perhaps to avoid predation by larger predators that may enter the channel at high-tide.

Related Topics

    loading  Loading Related Articles