期刊
NEOTROPICAL ICHTHYOLOGY
卷 15, 期 3, 页码 -出版社
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/1982-0224-20170055
关键词
Connectivity; Freshwater resident; Laser ablation; River migration; Streaked prochilod
类别
资金
- CONICET [PIP112-20120100543CO]
- Universidad de Buenos Aires
- ANPCYT [PICT 2010132]
- Entidad Binacional Yacyreta
- Administrative Commission of the River Uruguay (CARU)
- Government of the Principality of Asturias [FC-15-GRUPIN14-040]
The streaked prochilod, Prochilodus lineatus, represents the most important fishery in the La Plata Basin (South America). Our objective was to analyze brackish environment use by the streaked prochilod captured from Parana and Uruguay rivers. To accomplish this, lapillus otolith sections were analyzed for Sr:Ca with laser ablation-inductively coupled plasma-mass spectrometry (LA ICP-MS) to infer habitat use of fish. To the interpretation of transects, a threshold that represents the transition between freshwater and brackish environments was calculated using the Sr:Ca ratio of the otolith edge of specimens captured in the first section of the La Plata Estuary (salinity >= 0.5 PSU). The percentage of fish using the estuary was higher in the Parana (37%) than the Uruguay River (5%). Change-point analysis showed that fish entered the estuary between 1 and 3 times throughout life at a wide range of ages (0-15 years). These incursions had no obvious periodicity. This information should be integrated into future management actions, which should also be specific to each area since migration patterns differ between the major rivers of the basin.
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