Similar to agillnet, thetangle net, ortooth net, is a type ofnylonfishing net. Left in the water for no more than two days, and allowingbycatch to be released alive, this net is considered to be less harmful that other nets. The tangle net is used in thePhilippines by commercial fishermen, as well as by the scientific community. When spent, these nets can be bundled, and left on the sea floor to collect smaller species. These bundles are known locally as lumen lumen nets.

The tangle net originated inBritish Columbia, Canada, as a gear specifically developed for selective fisheries.^[1] Tangle nets have smaller mesh sizes than standard gillnets. They are designed to catch fish by their nose or jaw, enabling bycatch to be resuscitated and released unharmed.^[2][3] These nets are made with a very thin lightnylon rope, have a small mesh and are strung between two ropes, a top rope with floats, and a bottom rope with weights. Dropped to the bottom of the ocean, located and retrieved through the use of a guide line and buoy, these nets have allowed both fishermen and scientists to reach areas not previously accessible. Tangle nets are generally left on the bottom for no more than a day or two so that the fish and bycatch does not die and spoil.^{[citation needed]}

For the last two decades tangle nets have been set in deep water near steep underwater cliffs off many islands in thePhilippines by local fishermen in order to supplement their income through catching commercially valuablemollusks. Scientists have used this technique in recent years to explore the deep water marine habitat. The rich species diversity of thePhilippine Islands has been explored through the use of tangle nets which are able to obtain specimens from areas not reachable by traditional methods of usingtrawls anddredges.^[4] Through the placement of tangle nets 50 to 100 meters long, at depths from 100 meters to 400 meters, this cryptic marine habitat has been explored and many new and/or rare species ofgastropods andcrustaceans have been acquired.^[5] The success of deep set tangle nets was further exploited whenPhilippe Bouchet andDanilo Largo launched an expedition in 2004 to explore thePanglao area, known as the 2004 Panglao Marine Biodiversity Project.^[6][7]

When tangle nets are damaged beyond repair they are twisted and wrapped into long bundles, which thePhilippine locals call lumen lumen nets. These long, sausage-like bundles are placed on the sea bottom along drop-offs in deep water with strong currents and left for several months at a time, which allows time forveligers to settle and larvae to grow. Lumen lumen nets have yielded many more species of marine animals, including many very small species ofmicromollusks.^[8]

• Drift net
• Cast net
• Seine fishing

• Fishing industry
• Fishing techniques and methods
• Gastropods and humans
• Fishing nets

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