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Journal of Fish Biology – early view

Home Forums Ichthyology Journal of Fish Biology – early view

This topic contains 0 replies, has 1 voice, and was last updated by  Stefan 5 years, 5 months ago.

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  • #302331

    Matt
    Keymaster

    These two seem interesting:

    Cryptic diversity in the mtDNA of the ornamental fish Carnegiella strigata

    Mitochondrial DNA ( mtDNA) sequences of the marbled hatchetfish Carnegiella strigata, an ornamental fish exported from the Negro River, was examined to determine its genetic diversity and population structure in blackwater rivers (Negro and Uatumã Rivers) in the central Amazon. Analyses of a 646 bp fragment of the ATPase 6/8 mtDNA gene revealed two monophyletic lineages of C. strigata with considerable genetic distance between them (10–12%), suggesting that these lineages should not be considered a single stock. Furthermore, there were strong differences in the geographical distribution of the lineages. These results indicate a past association between drainages of the Negro and Uatumã Rivers. They also suggest that, in the Negro River, its main tributary, the Branco River, may act as a geographical barrier and potentially an ecological barrier between populations of the middle and lower portions of the river.

    Remarkable karyotypic homogeneity in a widespread tropical fish species: Hoplosternum littorale (Siluriformes, Callichthyidae)

    The first chromosomal data in Hoplosternum littorale from an isolated South American drainage in north-eastern Brazil are presented. All specimens were characterized by a diploid number (2n) of 60 chromosomes divided into three metacentric, one submetacentric and 26 acrocentric pairs; single nucleolar organizer regions (NOR) on the sixth pair; centromeric and interstitial heterochromatin; GC-rich sites on four large acrocentric chromosomes, including the NOR-bearing pair, and 5S ribosomal genes at terminal region on short arms of two acrocentric pairs. These data are invariably similar to previous reports in H. littorale from distant localities throughout South America, which contrasts with the chromosomal diversity of Callichthyidae and reinforces the role of human activities on the dispersal and colonization of this fish.

    #348656

    Stefan
    Member

    Sign me up for the hatchet! :-)

    #348658

    Matt
    Keymaster

    Gladly.:P

    #348662

    Stefan
    Member

    Ever eager to get my head to the chopping block! Hatchet fish were a childhood favourite of mine actually.

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