amount of feedwas adjusted to the r

amount of feedwas adjusted to the real biomass in each tank. Fish were
fed 3 times a day at 8:00, 12:00 and 16:00 h. In order to reduce stress
and keep water quality high, the fish were not fed the day before and
the day when they were weighed.
The proximate composition of feeds was analyzed in terms of
moisture, ash, crude protein (Kjeldahl × 6.25), crude lipid (Soxhlet)
and crude fiber, following the methods described by AOAC (2000)
(Table 1). The analyses were carried out by the General Chemistry
Laboratory, Technological Superior Institute of the South of the
Yucatan State (ITSSY), Oxkutzcab, Yucatan, Mexico.