Streaked Prochilod

Fascinating facts about the Streaked Prochilod

• A single streaked prochilod can grow to 80 cm (2.6 ft) long and weigh up to 9 kg (20 lb), and it is commonly around 45 cm (1.5 ft) long.
• During the spring, these fish embark on long migrations to warm waters to spawn, often forming breeding pairs while males guard the eggs. Their journey fuels the entire river food web, because they can make up more than half of the total fish biomass in a system.
• In the Paraná River, experts say the sustainable harvest ceiling is 20,000 tonnes per year, but exports jumped from 13,000 tonnes in 1998 to 34,000 tonnes in 2004 after the Argentine peso fell. The surge reveals how market forces can quickly push a keystone species beyond its limits.
• Regulations in Santa Fe set a minimum capture size of 42 cm (17 in) in 2005, while neighboring Entre Ríos allowed 40 cm (16 in) until it matched the stricter rule. The mismatched limits sparked blockades on the Rosario-Victoria Bridge, illustrating how a few centimeters can ignite regional conflict over a fishery.
• The fish’s mouth is adapted to scrape biofilm and feed on amino-rich detritus while rejecting mineral matter, and it forms the base of the food chain for larger fish such as the surubí catfish and golden dorado.

At a glance

About the Streaked Prochilod

The streaked prochilod, Prochilodus lineatus, is a striking ray-finned fish that can grow to 80 cm (2.6 ft) and 9 kg (20 lb), though most individuals hover around 45 cm (1.5 ft). Its tall, laterally compressed body shimmers in greenish-gray tones, lighter on the belly, while yellow-green fins frame a forward-projecting, circular mouth lined with two rows of tiny teeth. This specialized mouth scrapes biofilm from riverbeds, allowing the fish to feed on a diet rich in detritus and amino-acid-laden organic matter while selectively avoiding mineral particles, a feeding strategy known as illiophagy. Endemic to the Paraná-Paraguay and Paraíba do Sul basins, as well as Lagoa dos Patos, Mar Chiquita, Rio Salado, and Laguna de Chascomus, the prochilod can dominate river biomass, sometimes exceeding half of the total fish mass. Each spring, it embarks on long migrations to warm waters, forming spawning pairs; males guard the nests, ensuring the next generation. A surprising trait is its ability to discern and select the most nutritious detritus, effectively ‘choosing’ its meals at a microscopic level, which underpins its pivotal role as the base of the Paraná River food chain, supporting predators such as the surubí catfish and golden dorado.

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