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首页> 外文期刊>Marine Biology: International Journal on Life in Oceans and Coastal Waters >Electroreception in neonatal bonnethead sharks, Sphyrna tiburo
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Electroreception in neonatal bonnethead sharks, Sphyrna tiburo

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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 naive neonatal bonnethead sharks, Sphyrna tiburo, to preysimulating weak electric fields. Sharks less than 24 h post-partuition 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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