Chromosomes of the Chocolate Gourami: A Cytogenetic Anomaly

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Science  16 Aug 1974:
Vol. 185, Issue 4151, pp. 618-619
DOI: 10.1126/science.185.4151.618


The chocolate gourami, Sphaerichthys osphromonoides, has the lowest chromosome number reported for fishes, with 2n = 16 and n = 8. Other members of the family Belontiidae have somatic numbers of 42 to 48. Chromosome instability is demonstrated by the presence of somatic abnormalities and meiotic multivalents.