The origin of the “chinuc salmon” is North America. Some specimens were brought from that subcontinent, such as trout, to cold areas of Chile in the ’80s of the last century. Now, for the first time, two female salmon specimens were detected in the Paraná River near the province of Santa Fe.
One of the characteristics of this animal is that it is a migrator. It is born and grows in freshwater rivers. Subsequently, it leaves the fresh water to the sea and, once it is developed as an adult species, it goes up the rivers to reproduce.
By the end of the 1990s, these non-native species had been discovered in the Santa Cruz River, which gives its name to the Patagonian province.
The first specimen was fished on November 3. The second, the 15. Both in the tributary that borders the lands of Santa Fe at the height of the town of Arroyo Seco.
“The Paraná is not an environment very similar to the typical rivers that salmonids have,” Andrés Sciara, former director of the Paraná River Aquarium located in Rosario, told El Litoral.
“Beyond the appearance, what would be interesting would be to have more systematic studies on their movements,” said Sciara. “At the aquarium we have the technologies to do the genetic studies,” she added.
The scientist pointed out that it is interesting to go a little further with the problem of invasive alien species. “What population are they, when do they appear,” he said. Regarding salmon, he said: “Although they seek freshwater environments, this is very different from where they breed.” The water temperature of the Paraná is higher than that of the rivers where they flow. The river has more sediment and does not have a rocky bed like the Patagonians.
“The aquarium gives the possibility of taking these issues in another way and being able to do scientific studies,” said the expert.
For his part, Damián Lescano, a graduate in Biotechnology and member of the Rosario aquarium’s scientific team, confirmed that there was a record of a salmon in our mightiest river, but that these were the first to reach the height of Santa Fe.
“It sounds very strange to find him in Paraná because it is not the environment in which they would feel comfortable,” Lescano emphasized. The aquarist announced that samples of the second specimen were taken for different scientific institutes. The scales, stomach, and parts of the head are removed to study the ear of the fish.
One of the studies to be carried out will be to test whether this pair of fish arrived from rivers in Argentine Patagonia or elsewhere. Finally, Lescano assured that there is no evidence that they can survive in the most temperate conditions, such as in the south of Santa Fe.
Source: The Coast.