Is sort of fishing vessel for fishing of shrimps and this is performing by mean of a trawl.The corect nave of the vessel is shrimp trawler vessel.My Spanish is not good enough for this translation but you can try.Good luck!

También se producen efectos negativos en los ecosistemas como resultado de cierto tipo de mecanismos de pesca (como la pesca a la rastra) y otras prácticas ...

www.medioambiente.cu/ainternacional/ecosismarinos.htm

El objetivo general de este proyecto en curso es reducir los descartes de peces capturados por los buques de pesca a la rastra de camarones, ...
www.fao.org/DOCREP/005/Y4777T/y4777t03.htm - 104k

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Definitions of trawling on the Web:

Fishing by dragging a net behind a boat along the sea floor, weighted by anchors. There are several trawling methods, including otter, single, pair, and beam trawls, which are designed to guide fish to the cone-shaped trawl net mouth and then capture them in a bag at the back of the net. The method typically results in significant bycatch and habitat destruction.
www.oceansalive.org/explore.cfm

Fishing by towing a trawl net. Find out more about trawling and see an animation of how it works in Seafood Watch-Gear Types.
www.reefed.edu.au/glossary/t.html

the most widely-used commercial fishing method, which uses complex nets made of components performing specialised functions
www.epa.nsw.gov.au/soe/95/28.htm

Trawling is a method of fishing that involves actively pulling a fishing net through the water behind one or more boats.
en.wikipedia.org/wiki/Trawling

he puesto esto porque según donde se esté y para quién sea la traducción lo de camarón puede no servir; en España se usa en el sur, pero aquí, en el norte, nunca diríamos camarón, es más, quizás la especie que llaman camarón no se capture por estos lares. Gamba, gambón, langostino...., si mirais algún listado especializado, vereis que dependiendo de la audiencia se entiende o no.