The influence of dam construction on a population of Leporinus obtusidens (Valenciennes, 1847) (Pisces, Anostomidae) in the Yacyretá Reservoir (Argentina)

dc.contributor
dc.creatorARAYA, P.R.; AGOSTINHO, A.A.; BECHARA, J.A.
dc.date2018-10-31T19:43:00Z
dc.date2018-10-31T19:43:00Z
dc.date.accessioned2023-10-16T12:28:06Z
dc.date.available2023-10-16T12:28:06Z
dc.identifierhttp://repositorio.uem.br:8080/jspui/handle/1/5285
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9211096
dc.descriptionARAYA, Patricia R.; AGOSTINHO, Angelo Antonio; BECHARA, José A. The influence of dam construction on a population of Leporinus obtusidens (Valenciennes, 1847) (Pisces, Anostomidae) in the Yacyretá Reservoir (Argentina). Fisheries Research, New York, v.74, no.1-3, p.198-209, 2005.
dc.descriptionA field study of age, growth and mortality of the boga , Leporinus obtusidens (Valenciennes, 1847) was carried out in the Yacyretá Reservoir, High Paran´a River, Argentina.We compared age-structure, length weight relationships and condition factor coefficients in phases previous (1990 1994) and subsequent (1995 1998) to the reservoir filling. In addition, we estimated total and natural mortality, as well as the growth and yield parameters for the whole study period. Comparisons were carried out in four sampling points within the river main channel. Fish were sampled monthly with nine gillnets ranging from 40 to 160mm of total mesh opening (opposed knots). A scale study showed an age range comprised between 1 and 13 years, with ages 4 and 5 the most abundant before reservoir filling, whereas ages 2 and 3 were more frequent afterward. The weight standard length relationship showed a higher growth during the second phase of reservoir filling. Maximum condition factorwas registered before the spawning period (August and September), being higher after the impoundment, and particularly in the sampling site located within the reservoir. The von Bertalanffy growth coefficient, K, reached 0.12 in both sexes, while the asymptotic length, L∞, was 578 and 547 mm, in females and males, respectively. Natural mortality according to Pauly s equation reached 0.178 year−1, and the total mortality was 0.36 year−1. The Beverton and Holt yield per recruitment (Y/R) was estimated as 246.54 g, with a maximum sustainable yield of 248.00 g. This result suggests that the species had higher condition after impoundment and is fished near its maximum capacity in the reservoir.
dc.description
dc.publisherBrasil
dc.publisherUEM
dc.rightsopenAccess
dc.subjectIdade
dc.subjectCrescimento
dc.subjectMortalidade
dc.subjectRecrutamento
dc.subjectReservatório
dc.subjectLeporinus obtusidens
dc.subjectParaná, Rio
dc.subjectReservatório de Yacyretá
dc.subjectArgentina.
dc.subjectAge
dc.subjectGrowth
dc.subjectMortality
dc.subjectYield per recruitment
dc.subjectDam construction effects
dc.subjectLeporinus obtusidens
dc.subjectParaná River
dc.subjectYacyretá Reservoir
dc.subjectArgentina.
dc.subjectCiências Biológicas
dc.subjectEcologia
dc.titleThe influence of dam construction on a population of Leporinus obtusidens (Valenciennes, 1847) (Pisces, Anostomidae) in the Yacyretá Reservoir (Argentina)
dc.typearticle


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