Lateral Line Receptivity in the Mottled Sculpin (Cottus bairdi)

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Abstract
We studied the lateral line receptive field of the mottled sculpin (Cottus bairdi) to live Daphnia magna and to an inert vertically vibrating bead. Both stimuli elicited feeding responses when near the head or trunk but response to stimuli near the trunk extended only as far as the posterior limit of the lateral line (beneath the soft dorsal fin). The sculpin was significantly less responsive to stimuli for the region in front of the snout compared to the side of the head. The region in which the sculpin strikes (strike zone) at prey extended slightly posterior to the mouth and occupied a mean area of 16.0 mm2 for Daphnia, 14.1 mm2 for the bead (both based on four fish). Prey detected outside this region elicited repositioning by the fish so that the prey''s original location was in the strike zone.

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