A study was conducted on the effect of water temperature on fattening of blackspot sea bream, comparing growth in fish kept in tanks with water at room temperature (13.6-19.2 degrees C) with the growth in water heated at a constant temperature of 19, with two batches of 300 fish, born in captivity, with an initial weight of around 20.25 g and 48.74 g. These in turn, were distributed into groups. Bimonthly samplings were made on size and weight, for 18 months. The average weight attained by the smaller sized fish was around 300.78 g, at room temperature, and 304.09 g in warm water. The larger sized individuals attained weights of about 355.06 g and 359.42 g at room temperature and warm water, respectively. The results show no significant differences between the growth for the batches of fish fattened at the temperature ranges studied.