Dissolved oxygen and temperature were monitored with an oximeter (YSI model 55,
Yellow Springs, Ohio, USA) twice a day (at 08:00 and 16:00 h) and maintained at 5.8 ppm
and 28 C. Salinity (ppt) was measured with a refractometer (Atago model 2493 Master—
S/MillM, Japan), pH with a pH meter (Schott Model Lab 850, Germany) and ammonium
(NH4) with a spectrophotometer (Thermo Scientific, Modelo Helio Gamma, England) were
monitored once a week (at 16:00 h).
Dissolved oxygen and temperature were monitored with an oximeter (YSI model 55,Yellow Springs, Ohio, USA) twice a day (at 08:00 and 16:00 h) and maintained at 5.8 ppmand 28 C. Salinity (ppt) was measured with a refractometer (Atago model 2493 Master—S/MillM, Japan), pH with a pH meter (Schott Model Lab 850, Germany) and ammonium(NH4) with a spectrophotometer (Thermo Scientific, Modelo Helio Gamma, England) weremonitored once a week (at 16:00 h).
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