("Arte" here means "net": "6. amb. Instrumento que sirve para pescar", DRAE.)

I think it would be best to leave it in Spanish and add an explanation. They are referred to as "persianas" in these English accounts of Andalusian shrimp fishing:

"A local fisherman has also designed a net called the Persiana. [...] The Persiana net was by far the best net."
http://www.sitesalive.com/wl/99f/public/wlfinal.htm

"The Persiana net, a less widely used alternative, has two different exclusion devices. It has a turtle exclusion device and another device intended to reduce the catch of fish and other bycatch. This net is not so popular because it is more expensive than the Magdalena I, plus most of the fishermen already have the first net."
http://www.sitesalive.com/wl/private/00f/essay/wle001030.htm

It's a recognised type of net, defined as follows in regional legislation:

"5. Persiana: Este arte se utiliza como la cuchara, desde el barco coriano. La red que forma el copo si fija a dos varas horizontales que se desplazan verticalmente formando la boca del arte, de forma que la vara superior se coloca a ras de agua y la inferior regula la apertura de boca. La longitud de las varas no podrá ser superior a 20 m y la apertura de boca será inferior a 2 m. Se prohíbe todo tipo de arte diferente a las descritas y, expresamente, las nasas libres en el fondo del cauce principal y las situadas en la orilla, así como cualquier otro tipo de arte fija como las bateas o bidonadas."
http://www.juntadeandalucia.es/boja/1998/4/d9.pdf

I think the nearest equivalent is a push net. It's not a scoop net, I think; that is the "cuchara" mentioned in the statute just quoted as a different type. See here: there are push nets with two poles which sound quite similar to the persiana:
http://www.fao.org/fishery/fishtech/1023/en

You may not want to add the literal translation "roller blind", but I think it may help people to understand why they're called that. The image must be of a roller blind between two poles.

By the way, on the "mosquitera" part, the following may be enlightening; it seems to be a matter of the mesh gauge:

"Van provistos de redes denominadas “persianas” con luz de malla hasta ahora legales con un mínimo de 1 mm y longitud de red que pueden superar los 15 metros. Sin embargo son frecuentes las redes ilegales con luz menor de 1 mm, denominadas “mosquiteras”, que se montan sobre las “persianas” realizando pesca furtiva nocturna."
http://www.magrama.gob.es/es/pesca/temas/planes-de-gestion-y... (p. 12).