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Therefore, there is an optimal foraging area for S. On the other hand, the closing of the river mouth would cause a decrease in the abundance of prey and could trigger the dispersion of YOY S.

The greater predation probability probably determines the longer residence time reported for S.

The first estimations of site fidelity, home range, or distances travelled for these sharks in a nursery area associated to a river mouth generated an important research baseline for further investigations in the area and the entire Mexican Pacific, as large concentrations of juvenile sharks were found near the river mouths in Sonora Bizzarro et al.

Reproductive biology of the scalloped hammerhead shark Sphyrna lewini Chondrichthyes: Sphyrnidae off south-west Mexico.

Temporal variation in the artisanal elasmobranch fishery of Sonora, Mexico.

Similar shark mobility during the 24 h period was observed; however, the largest movements were detected during the dawn and at dusk.

In these periods, the signal of the tagged shark was easily lost during active tracking due to their greater speed of movement.

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