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First published online December 2, 2005
Journal of Experimental Biology 208, 4613-4625 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01963

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Composition, morphology and mechanics of hagfish slime

Douglas S. Fudge^*, Nimrod Levy, Scott Chiu and John M. Gosline

Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC V6T 1Z4, Canada

^* Author for correspondence at present address: Department of Integrative Biology, University of Guelph, Guelph, ON N1G-2W1, Canada (e-mail: dfudge{at}uoguelph.ca)

Accepted 26 October 2005

Hagfish slime consists of mucins and protein threads that are released from slime glands and mix with seawater to produce an ephemeral material with intriguing physical properties. We recently characterized the mechanics of the slime's fibrous component, and here we report the first mechanical properties of the mucin component and the slime as a whole. Our results suggest that hagfishes can produce remarkable quantities of the slime because it is almost three orders of magnitude more dilute than typical mucus secretions. Mechanical experiments using whole slime produced in vitro demonstrate that the slime threads dominate the slime's material properties and impart elasticity. Mucins impart viscosity at the strain rates tested and are important for rapid deployment of the slime. We also found that slime threads are tapered at both ends, which suggested to us that hagfish slime might best be modeled as a discontinuous fibre-reinforced composite. Our measurements demonstrate that the mucins are not capable of providing shear linkage between threads, but this is not necessary because the threads are long enough to span an entire slime mass. Our findings suggest that hagfish slime consists mainly of bulk seawater entrained between mucin-coated threads, and in this way functions more like a fine sieve than coherent mucus. These results are consistent with the hypothesis that the slime has evolved as a defense against gill-breathing predators.

Key words: biomechanics, slime, mucus, hagfish, fibre-reinforced composite

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This article has been cited by other articles:

				D. S. Fudge, T. Winegard, R.H. Ewoldt, D. Beriault, L. Szewciw, and G.H. McKinley From ultra-soft slime to hard {alpha}-keratins: The many lives of intermediate filaments Integr. Comp. Biol., July 1, 2009; 49(1): 32 - 39. [Abstract] [Full Text] [PDF]

				J. Lim, D. S. Fudge, N. Levy, and J. M. Gosline Hagfish slime ecomechanics: testing the gill-clogging hypothesis J. Exp. Biol., February 15, 2006; 209(4): 702 - 710. [Abstract] [Full Text] [PDF]