Total polyamines and free nucleotides have been studied in the heart, red and white muscle, brain and liver of one and two years old European sea bass (Dicentrarchus labrax L.) and gilthead (Sparus auratus L). The liver has the highest amount of total polyamines than all the other tissues and it is followed by brain heart and red muscle. Only in the sea bass, the single polyamines of the heart, muscle and brain increase according to the age; in the liver of both fish, putrescine decreases while spermidine and spermine increase as regards to the age. During the growth of sea bass, adenylic nucleotides show important but not statistically significant variations in the white muscle and an opposite pattern in the red muscle. The energy charge is not affected in the white muscle and increases significantly in the red muscle. In the liver of sea bass, nucleotides triphosphate, UDPAG and NAD+ increase according to the age. These results provide useful indications about the growth, development and metabolic capability of the investigated teleosts.
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