Fishing trawler sea

Trawlers are industrial fishing vessels that drag nets along the seabed, catching large volumes of fish and seafood.

About this subject

Trawlers are vessels designed for trawling, a fishing method that tows a funnel-shaped net (trawl) through the water or along the seabed. This technique accounts for about 25% of the world's total marine catch, being especially prevalent in the North Atlantic, the Pacific, and regions like southern Brazil. There are two main types: bottom trawling, which scrapes the seafloor, and midwater trawling, which operates in the water column.

Trawling is highly efficient but also controversial. Bottom trawling can destroy benthic habitats such as coral reefs and sponge gardens, and its bycatch includes turtles, dolphins, and seabirds. It is estimated that 40% of global bycatch comes from this practice. Additionally, trawling contributes to overfishing of target species like cod and hake, with economic and ecological consequences.

To mitigate these impacts, regulations such as fishing quotas, marine protected areas, and turtle excluder devices (TEDs) are implemented in many countries. In Brazil, trawling is regulated by IBAMA, with seasonal restrictions and distance-from-coast limits. However, enforcement faces challenges due to the extensive coastline and illegal fishing fleets.

Despite the controversies, modern trawlers are equipped with sonar, GPS, and refrigeration systems that enable long voyages and selective catches. Large fleets from Japan, Russia, and the European Union operate in international waters, while smaller vessels sustain coastal communities. The sustainability of trawl fishing depends on effective management and technological innovation.

Frequently Asked Questions

What is a fishing trawler?

It is an industrial fishing vessel that tows a net through the water to catch large quantities of fish. There are bottom trawlers and midwater trawlers.

How does trawling work?

The trawl net is deployed and towed by the vessel. Doors keep the net open horizontally, while floats or weights control depth. The catch collects in the net's codend.

What are the environmental impacts of trawling?

Bottom trawling damages marine habitats, produces high bycatch, and contributes to overfishing. Measures like turtle excluder devices help mitigate these effects.