Marcaciones de Peces en el Embalse de Salto Grande, Río Uruguay (Argentina-Uruguay)

Delfino, Ricardo; Baigún, Claudio

doi:10.14409/natura.v1i16.3458

Cited by 13 publications

(19 citation statements)

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“…On the other hand, the results found in the present study are not conclusive in relation to other species, and the information in the literature is still limited. Delfino & Baigún (1985) observed, however, that spe- Fig. 3.…”

Section: Discussionmentioning

confidence: 97%

“…The movement of each fish was analyzed individually on a graph that related the time (x axis) and the distance traveled (y axis), which allowed us to infer their speed downstream and upstream (Delfino & Baigún, 1985;Agostinho et al, 1994). In this case, the data matrix also included only those fish that had traveled more than 5 km; however, the time limit was 300 days, considering only those fish with a mean speed above 1 km/day.…”

Section: Discussionmentioning

confidence: 99%

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Blockage of migration routes by dam construction: can migratory fish find alternative routes?

et al. 2007

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The present study explored the interaction between the upriver migration of fish and the blockage of their migration routes by dam construction. Specifically, we studied (i) the capacity of migratory fish to locate alternative routes in the presence of an obstacle, and (ii) the behavior of the fish after they were artificially transferred to the reservoir. With the use of the markrecapture technique (tagging), the study was carried out near Porto Primavera Dam (UHE Engenheiro Sérgio Motta) between 1994 and 1999, a period prior to the closure of the floodgates and the installation and operation of the fish pass facilities. The fish were caught in the dam forebay downstream, marked with LEA type tags, and released upstream (5113 individuals; 14 species) and downstream (1491; 12) from the dam. The recaptures were carried out by local professional and amateur fishermen. A total of 188 individuals (2.8%) were recaptured, mostly the curimba Prochilodus lineatus. Nearly half of the recaptures downstream occurred in tributaries, especially in the Paranapanema River, indicating that in the presence of an obstacle the fish are able to locate alternative migration routes. The remainder stayed in the main channel of the Paraná River, at a mean distance of less than 50 km from the release point. Of the fish released upriver from the dam, approximately half were recaptured downriver. Although the river was only partly dammed, the movement of the fish downriver suggests that they became disoriented after being transferred. Those that remained upriver avoided the reservoir and moved, rather rapidly, toward the lotic stretches farther upstream. From these results it is clear that, in the course of the decision process in installing fish passes, it is necessary to take into account the existence of spawning and nursery areas downriver and upriver from the reservoir.O presente estudo visa explorar a interação entre a migração ascendente de peixes e a obstrução de vias migratórias, pela construção de barragens. Especificamente, foi estudada (i) a capacidade de peixes migradores em localizar rotas alternativas na presença de um obstáculo, e (ii) o comportamento dos peixes após serem transpostos artificialmente para o reservatório. Com o uso da técnica de marcação e recaptura, o estudo foi desenvolvido nas imediações da barragem da hidrelétrica de Porto Primavera, entre 1994 e 1999, período anterior à instalação e operação de mecanismos de transposição. Os peixes foram capturados a jusante, nas imediações da barragem, receberam marcas do tipo "LEA" e foram liberados a montante (5113 indivíduos; 14 espécies) e a jusante (1491; 12) da barragem, sendo as recapturas realizadas por pescadores profissionais e amadores da região. No total, foram recapturados 188 indivíduos (2,8%), a maioria de curimba Prochilodus lineatus. Praticamente metade das recapturas de jusante ocorreram em tributários, especialmente no rio Paranapanema, indicando que na presença de um obstáculo os peixes são capazes de localizar rotas alternativas de migração. O res...

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Blockage of migration routes by dam construction: can migratory fish find alternative routes?

et al. 2007

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“…Qualitative observations about fish migration behavior observed shortly after closure are valuable because they provide information about the natural behaviors of fish populations (Delfino et al, 1986). After river closure, large numbers of fishes were observed in the tailrace attempting to migrate, primarily during March-April and September-October (Delfino & Baigún, 1985) coincident with the primary spring flood pulse and the secondary fall hydrograph peak of the Paraná River.…”

Section: Salto Grande Dammentioning

confidence: 99%

“…Migrations are triggered by climatic and hydrological cues (Vazzoler et al, 1997), and the stimulus for the onset of migration for each species seems to be similar in the lower and upper basin (Agostinho et al, 2003). Some species such as Prochilodus lineatus (sabalo), Salminus brasiliensis (dorado), Leporinus obtusidens (boga), Luciopimelodus pati (pati), Pseudoplatystoma corruscans, (surubí pintado), Pseudoplatystoma fasciatum (surubí atigrado), Piaractus mesopotamicus (pacú) and Zungaro jahu (manguruyú; the species from La Plata drainage has been long referred as a synonym of Zungaro zungaro but it is a valid species and distinct from Z. zungaro from the Amazon) are capable of making long migrations (Bayley, 1973;Bonetto, 1986;Tablado & Oldani, 1984;Delfino & Baigún, 1985;Espinach Ros et al, 1998;Sverlij et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Is fish passage technology saving fish resources in the lower La Plata River basin?

Oldani¹,

Baigún

Nestler

et al. 2007

Neotrop. ichthyol.

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Over 450 dams have been constructed in the upper Paraná River basin in Brazil during the past 40 years. River regulation by these dams is considered a primary factor in the reduction of fish diversity and depletion of migratory species. In contrast to the upper Paraná Basin, only two large dams (both with upstream fish passage) have been constructed in the lower La Plata River basin. Fishery managers in the lower basin are concerned that existing and planned dams will further deplete populations of migratory fish species that constitute important recreational and commercial fisheries as has occurred in the upper basin. We assessed the sustainability of fisheries in the lower basin in the face of increased river regulation by using literature information to describe the efficiency of the fish passage systems used to mitigate river regulation impacts on fisheries. Our analysis shows that fish passage systems at both lower basin dams, Yacyreta and Salto Grande, fail to transfer sufficient numbers of upstream migrants to sustain populations of migratory species. Fish passage efficiency of target species in the fish elevators at Yacyreta is less than 2%. Fish diversity in the fish elevators is low because about 85% of the fish belong to only three nonmigratory species (Pimelodus maculatus, Oxydoras kneri and Rhinodoras dorbignyi). Large migratory species targeted for passage rarely comprise even 5 % of the fish number in the passage system. The two Borland locks at Salto Grande Dam cannot dependably pass large numbers of migratory species because passage efficiency is dependent upon interactions of powerhouse and spillway operation with tailrace elevations. Most species in the Borland system were either a small catfish (Parapimelodus valenciennis) or a engraulid (Lycengraulis grossidens). Again, the targeted migratory species were not abundant in the passage system. We conclude that existing fish passage technology in the lower basin is inadequate and that improved fish passage designs are required to conserve migratory species. These designs must be based on integrated information from geomorphology (habitat), natural fish behavior, fish swimming capabilities, and detailed population studies.Mais de 450 barragens foram construídas no alto rio Paraná, Brasil, nos últimos 40 anos. A regulação dos rios por barragens é considerada um dos fatores primários de redução da diversidade de peixes e depleção de espécies migratórias. Em contraste, somente duas grandes barragens foram construídas nos trechos mais inferiores da bacia do rio da Prata. No momento, há uma grande preocupação acerca do impacto dos represamentos sobre espécies que se constituem a base da pesca comercial e esportiva na bacia. Este artigo aborda o desempenho das passagens de peixes das barragens de Yacyreta e Salto Grande, monstrando que as mesmas falham na transferência de grandes quantidades de espécies migratórias para os trechos a montante. A barragem de Yacyreta tem dois elevadores com problemas importantes de projeto. Como resultado, a eficiência n...

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“…some conventional tagging studies have revealed extreme mobility of some species like dourado (Salminus brasiliensis) or curimata (Prochilodus platensis). in the uruguay river, dourados were recaptured at a distance of 850 km from the point of release and curimata 620 km (Delfino & baigun, 1985). telemetry studies are extremely rare, due to infrastructural, funding and safety restrictions in south American countries.…”

Section: Introductionmentioning

confidence: 99%

Activity patterns of South American silver catfish (Rhamdia quelen)

Schulz

Leuchtenberger

2006

Braz. J. Biol.

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The South American silver catfish (Rhamdia quelen) is a widely distributed species in Central and South America in areas east of the Andes between Venezuela and the northern parts of Argentina. The bottom dwelling species occurs in lakes and reservoirs as well as in rivers. Between June 2000 and December 2001, sixteen silver catfish were tracked during fourteen 24-h cycles in two-hour-intervals, with the aim of investigating daily movements and habitat use. Covered distances varied between 0 m/2 h and 326 m/2 h and the mean distance covered in 2 h was 25.6 m. The mean activity of individual silver catfish varied between 5.6 m/2 h and 81.4 m/2 h. The swimming activity was linearly related to the total fish length. The highest mean swimming activity occurred in the morning and at nightfall. Silver catfish concentrated in three areas of frequent use. All of them were characterized by steep banks providing shelter in the form of rip-rap or large woody debris. Vertically, silver catfish preferred the upper 2 m layer where tracked fish encountered higher temperatures and higher dissolved oxygen concentrations.

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Marcaciones de Peces en el Embalse de Salto Grande, Río Uruguay (Argentina-Uruguay)

Cited by 13 publications

References 0 publications

Blockage of migration routes by dam construction: can migratory fish find alternative routes?

Blockage of migration routes by dam construction: can migratory fish find alternative routes?

Is fish passage technology saving fish resources in the lower La Plata River basin?

Activity patterns of South American silver catfish (Rhamdia quelen)

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