Interesting article, I've watched the jawfish behaviour a few times in Bali.
From the guardian.co.uk
Jawfish are very vulnerable when out its hole, I'm fairly sure they gain protection around the octopus.
From the guardian.co.uk
A sign uses lyrical questions to tell the story of jawfish and garden eels, who like to burrow in coral sand.
From the newsobserver.com
They identified the jawfish species and were fascinated by the peculiar association between the jawfish and the octopus.
From the guardian.co.uk
In his video, we see the small and shy black marble jawfish closely following a brazen and audacious mimic octopus whilst it moves across the sandy bottom.
From the guardian.co.uk
Jawfish took an $885,000 seed round in January of last year and then added a $2.8 million bridge note with participation from FF Angel, that's an early-stage fund associated with Founders Fund.
From the techcrunch.com
More examples
Small large-mouthed tropical marine fishes common along sandy bottoms; males brood egg balls in their mouths; popular aquarium fishes
Opistognathidae (opisto = "behind", gnath = "mouth"), commonly referred to as jawfishes, are classified within Order Perciformes, Suborder Percoidei. They are found throughout shallow reef areas of the Atlantic and Pacific Oceans, and the Gulf of Mexico.
Species of small bony fishes belonging to the family Opistognathidae. Jawfishes inhabit sandy, rubble-strewn areas on the reefs where they dig burrows into which they retreat when danger threatens. They hover over their burrows and feed on small animals that swim or drift by. ...