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- Title
A long-term study on the larval distribution of the migratory fish Salminus brasiliensis (Characiformes: Bryconidae) in a dam-free section of the Paraná River, Brazil.
- Authors
dos Santos Picapedra, Pablo Henrique; Kashiwaqui, Elaine Antoniassi Luiz; Piana, Pitágoras Augusto; Sanches, Paulo Vanderlei
- Abstract
The objective of this study was to use larval density data to investigate the temporal reproductive pattern and use of different biotopes of the Paraná River as areas of reproduction and the initial development of the migratory fish Salminus brasiliensis. During 15 reproductive periods (October to March) between 2001 and 2019, three biotopes (channel, tributary, and lake) of the upper Paraná River floodplain were sampled using conical-cylindrical plankton nets equipped with a flowmeter. The highest larvae densities were recorded between October and January, with a predominance of the pre-flexion and flexion stages captured mainly in the Paraná River channel. Larvae in the yolk-sac stage were most common in the tributaries. Temperature, pH, and rainfall were the main variables that influenced larval density. Our results showed that the reproduction of S. brasiliensis may have failed during a few reproductive periods and that the species uses different biotopes of the Paraná River for spawning and development, i.e., the tributaries and the river channels and lakes, respectively. Thus, providing conditions enabling a smooth migration to the tributaries for spawning as well as ensuring safe development in the river channels and lakes during their reproductive periods could help conserve this vulnerable species. Moreover, actions aimed at recovering the stocks of the species depend on the conservation of different floodplain environments and the maintenance of their original characteristics and on policies aimed to conserve the species, such as the prohibition of fishing.
- Subjects
BRAZIL; MIGRATORY fishes; GEOGRAPHICAL distribution of fishes; RIVER channels; CHARACIFORMES; FLOODPLAINS
- Publication
Environmental Biology of Fishes, 2023, Vol 106, Issue 4, p641
- ISSN
0378-1909
- Publication type
Article
- DOI
10.1007/s10641-023-01403-3