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Electroreception in neonatal bonnethead sharks, Sphyrna tiburo
Kajiura, S.M. (2003). Electroreception in neonatal bonnethead sharks, Sphyrna tiburo. Mar. Biol. (Berl.) 143(3): 603-611. hdl.handle.net/10.1007/s00227-003-1099-3
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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    Marine

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  • Kajiura, S.M.

Abstract
    The ability of sharks to orient to weak electric fields is well documented, but a detailed analysis of orientation pathways is lacking. Digital video analysis was used to quantify the behavioral response of naïve neonatal bonnethead sharks, Sphyrna tiburo, to prey-simulating weak electric fields. Sharks less than 24 h post-parturition failed to demonstrate a positive feeding response to the electrodes whereas vigorous biting at the electrodes was observed in all sharks greater than 32 h post-parturition. Orientation behaviors were classified as one of five types: "straight" approach, "single turn," "overshoot," "spiral tracking," and "orient without biting." One-third of all orientations were elicited at stimulus intensities of less than 20 nV cm-1. The median electric stimulus threshold for initiation of orientation was 47 nV cm-1 and the minimum was less than 1 nV cm-1. Most orientations to the dipole were from a distance of less than 10 cm with a maximum orientation distance of 22 cm. The innate feeding response to electric stimuli is demonstrated for the first time in a chondrichthyan fish.

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