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Over the past few decades, magnetoreception has been discovered in severalspecies of teleost and elasmobranch fishes by employing varied experimentalmethods including conditioning experiments, observations of alignment withexternal fields, and experiments with magnetic deterrents. Biogenic magnetitehas been confirmed to be an important receptor mechanism in some species, butthere is ongoing debate regarding whether other mechanisms are at work. Thispaper presents evidence for magnetoreception in three additional species, reddrum (Sciaenops ocellatus), black drum (Pogonias cromis), and sea catfish(Ariopsis felis), by employing experiments to test whether fish responddifferently to bait on a magnetic hook than on a control. In red drum, thecontrol hook outcaught the magnetic hook by 32 - 18 for chi-squared = 3.92 anda P-value of 0.048. Black drum showed a significant attraction for the magnetichook, which prevailed over the control hook by 11 - 3 for chi-squared = 4.57and a P-value of 0.033. Gafftopsail catfish (Bagre marinus) showed nopreference with a 31 - 35 split between magnetic hook and control forchi-squared = 0.242 and a P-value of 0.623. In a sample of 100 sea catfish inan analogous experiment using smaller hooks, the control hook was preferred62-38 for chi-squared = 5.76 and a P-value of < 0.001. Such a simple method foridentifying magnetoreceptive species may quickly expand the number of knownmagnetoreceptive species and allow for easier access to magnetoreceptivespecies and thus facilitate testing of magnetoreceptive hypotheses.

Evidence for Magnetoreception in Red Drum (Sciaenops ocellatus), Black Drum (Pogonias cromis), and Sea Catfish (Ariopsis felis)