(full paper is archived in the Miller Library)
Title: Use of the giant fiber for feeding and escape response in hatchling Sepioteuthis lessoniana
Student Author(s): Li, Christina
Faculty Advisor(s): Gilly, William
Location: Final Papers Biology 175H
Date: June 1991
Abstract: Free-swimming Sepioteuthis lessoniana hatchlings were videotaped during both feeding and strobe flash sessions. Analysis showed that while feeding the peak instantaneous velocity obtained by the hatchling is twice as great and the peak acceleration is 50% greater than during an escape response to a strobe flash in which only the giant axon is used. Behavioral measurements of mantle radius made with video were used to compute jet thrust and compare performance with varying patterns of motor neuron activity in the restrained hatchling. The coordinated, adultlike pattern of giant and small fiber use resulted in mantle contractions and jet thrusts that were always greater than contractions and thrusts produced by giant-only or small-only responses. Thus, evidence strongly suggests that hatchling Sepioteuthis use the giant fiber in feeding attacks.