Between a rod and a shark place: Scientists reel in whopping double catch

Talk about efficiency! A fish within a fish - caught with one line

A shark snaps up an unlucky dogfish (ORB Lab/Facebook)

Students from the University of Delaware had a good start to shark fishing season - catching two at the same time.

The scientists from the Ocean Exploration and Remote Sensing, Biogeography Lab got more than they bargained for when they reeled in a large female sand tiger shark - and discovered a 3ft dogfish inside its giant mouth.

"This unlucky smooth dogfish couldn't resist the menhaden used as bait and unfortunately fell victim to one of the top predators in the bay," said a post on the laboratory's Facebook page.