Early replication bands in two scorpion fishes, Scorpaena porcus and S. notata (order Scorpaneiformes)

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Abstract
The use of the BrdU-FPG methodology in the scorpion fish (Scorpaena porcus) has allowed us to estimate the mean cell cycle duration in kidney cells in vivo as being approximately 32.5 h. On the basis of this datum, replication protocols from 30 to 10 h of BrdU incorporation were employed revealing a precise order in the replication of the chromosomes. Treatments of 18–20 h proved to be the most useful in getting optimum replication bands and were used to elaborate the RBG-banding pattern karyotypes of S. porcus and S. notata. Their comparison confirms the high karyotypic distance between these morphologically similar species.