Abstract
A cytogenetic study was carried out on the chromosomes and the nuclear DNA content of the freshwater goby Economidichthys pygmaeus (Pisces, Gobiidae). The species is characterized by a 2n=46 karyotype consisting of 12 submetacentric and 11 subtelocentric chromosome pairs (NF=70). Major (45S) rDNA genes are terminal-centromeric located on the short arm of a single medium-small sized submetacentric pairas assessed by in situ hybridization, CMA3 staining, and Ag-NOR banding. The haploid (C-value) nuclear DNA content is 0.93±0.003 picograms. The cytogenetical data of Economidichthys pygmaeus were compared with those ones already available for other related gobies.
Highlights
Economidichthys pygmaeus is an endemic small-bodied, short-lived species restricted to the north and western part of Greece (Miller 1990)
Despite the importance of this species in terms of conservation, information on many aspects of its biology, ecology and behaviour are lacking in the current literature, and no data on karyotype are available at present (Miller 1990)
The haploid n=23 and the diploid 2n=46 chromosome numbers were determined for E. pygmaeus (Fig. 1 and Fig. 2) from the counts of 50 and 94 plates, respectively
Summary
Economidichthys pygmaeus is an endemic small-bodied, short-lived species restricted to the north and western part of Greece (Miller 1990). It is distributed in the Thiamis, Louros, Arahcthos and Achelloos Rivers and in Lakes Trichonis, Lyssimachia, Ziros and Ozeros. Despite the importance of this species in terms of conservation, information on many aspects of its biology, ecology and behaviour are lacking in the current literature, and no data on karyotype are available at present (Miller 1990). In such research frame the present cytogenetical study is included
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