[No Title Available]

Mediavilla, E.; Jiménez-Vicente, J.; Fian, C.; Muñoz, J. A.; Falco, E.; Motta, V.; Guerras, Eduardo

doi:10.1590/s0100-84551997000300029

Cited by 1 publication

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“…Fish from the family Heptapteridae exhibit simple NORs that differ in terms of chromosome localization and position (Dias and Foresti 1993;Vasconcelos and Martins-Santos 2000). However, in the genus Rhamdia, the location, position and number of these regions are conserved and found in the short arm of (Hochberg and Erdtmann 1988;Vissoto et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Natural triploidy in Rhamdia quelen identified by cytogenetic monitoring in Iguaçu basin, southern Brazil

Silva

Matoso

Ludwig³

et al. 2011

Environ Biol Fish

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The freshwater silver catfish from the genus Rhamdia belongs to a group of neotropical fish with wide distribution throughout Central and South America. The results obtained in the F1 generation of native specimens of this species bred in captivity using molecular cytogenetic tools revealed a high number of triploid specimens (46.8%) in the samples analyzed. The use of double fluorescent in situ hybridization (double-FISH) with 18S and 5S rDNA probes allowed highlighting the location of ribosomal sites with independent activity. This chromosome marker allowed the identification of triploid nuclei, in which three markers were visualized, in contrast to diploid fish, which only exhibited two fluorescent signals. As triploid specimens exhibit either total or partial gonad sterility, the present study demonstrates the importance of cytogenetic monitoring in restocking programs aimed at genetic conservation.

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Section: Discussionmentioning

confidence: 99%