Ah, but you can also use hagfish slime as a substitute for eggwhite. Hagfish slime recipe.
and there are other uses for these slimy creatures
including using their slime as filiments.
The slime's prodigious strength and even more remarkable fecundity has attacked the attention of several scientists now trying to replicate it in the lab. While scientists are just begining to understanding how the so-called gland thread cells (GTCs) that produce the slime might actually work, others are already seeking to commercialize the slime as a high performance fiber.
Read more at: http://phys.org/news/2014-09-ultimate-biofilament-hagfish-slime.html#jCp
however, before you look forward to a job removing slime from hagfish, the article notes that the scientists hope to put the slime making gene into a bacteria to produce the slime.