The phrase "crab trap" refers to a device used to catch crabs underwater. It is a type of trap that is designed to lure crabs inside and prevent them from escaping. Full definition
At the meeting, Canadian marine biologist Julie van der Hoop of Aarhus University in Denmark told the tale of a male named Ruffian who became entangled in a snow crab trap off Canada sometime between August 2016 and January 2017. (sciencemag.org)
They likewise came across carrion - feeding flesh flies emerging from a dead rodent, two nearly microscopic hermit crabs trapped dozens of kilometers from the closest seashore and a larval - stage beaded lacewing, which immobilizes termites with a chemical released from its anus before eating them. (scientificamerican.com)
In one experiment, U.S. scientists baited crab traps off the coast of Georgia with fresh or rotten fish and found that fresh carrion attracted almost three times as many animals, showing that «bacteria compete with large animal scavengers by rendering carcasses chemically repugnant,» according to the study. (sciencemag.org)