NDLI: Karyotype stasis in four Atlantic Scombridae fishes: mapping of classic and dual-color FISH markers on chromosomes

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Fisheries Science : Volume 79, Issue 1, January 2013

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Karyotype stasis in four Atlantic Scombridae fishes: mapping of classic and dual-color FISH markers on chromosomes

Content Provider	Springer Nature Link
Author	Soares, Rodrigo Xavier Bertollo, Luiz Antonio Carlos Costa, Gideão Wagner Werneck Félix Molina, Wagner Franco
Copyright Year	2013
Abstract	Fish from the family Scombridae exhibit a biogeographical pattern that includes pelagic habits, high swimming ability, and migratory behavior of its species. Although genetic studies aimed at the management and conservation of some of its more intensely exploited species are available, cytogenetic analyses of Scombridae are scarce. In the present study, individuals of four species of this family were obtained in the vicinity of the St. Peter and St. Paul Archipelago in the Mid-Atlantic region. The chromosomes of these four species were analyzed using conventional staining, Ag-NORs, C-banding, CMA$_{3}$/DAPI fluorochrome staining, and dual-color FISH with 18S and 5S rDNA probes. Acanthocybium solandri and Scomberomorus brasiliensis showed 2n = 48 chromosomes (2st + 46a; FN = 50), while Thunnus albacares and T. obesus, which also had 2n = 48 chromosomes, share another karyotype structure (2m + 2st + 44a; FN = 52). Discrete heterochromatic blocks are present in the centromeric regions of the chromosomes. 18S rDNA/Ag-NORs/CMA$_{3}$ $^{+}$/DAPI$^{−}$sites are located on the short arms of a subtelocentric pair that is apparently homeologous among the four species. The 5S rDNA genes on pair 24 are conserved in all of the species. Cytogenetic patterns showed a high degree of chromosomal conservation between the species. However, Thunnus species displayed greater karyotypic differentiation than A. solandri and S. brasiliensis. Pericentric inversions seem to be the primary mechanism involved in karyotype differentiation in this important fish group.
Starting Page	177
Ending Page	183
Page Count	7
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	79
Issue Number	2
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2013-02-09
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tuna Fish cytogenetics Pelagic fish Chromosomal markers Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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