Another is trawling, including bottom trawl. The net that is used for trawling is called a trawl. The boats that are used for trawling are called trawlers or draggers. Blobfish are often caught as bycatch in bottom trawling nets. The reefs are susceptible to damage by fishing, especially bottom trawling and dredging. Fishing has declined due to habitat degradation, overfishing, trawling, bycatch and climate change. The scientific community divides bottom trawling into benthic trawling and demersal trawling. Economic activity consists of subsistence fishing and commercial trawling activities. This also occurs in trawling and fishing nets. Midwater trawling is also known as pelagic trawling. The crabs are typically caught using small trawling nets. However local fishermen saw power trawling as a threat. Orange roughy is fished almost exclusively by bottom trawling. The main method of fishing is trawling. Cephalopods are caught by nets, pots, traps, trawling and hand jigging.