Environmental parameters of Hurun Bay estuary were monitored at the site of13.5 m3 floating net cages for Epinephelus cromileptes in July 2003. Averagedissolved oxygen inside cages was 3.68 – 6.76 ( average 5.35) mg/L with watertemperature 28.64 – 29.72 (29.09) oC. Salinity 32.69 – 33.0 (32.94) psu andturbidity 0.27 – 13.62 ( 1.15) NTU. Inflow rate of cages was 72 m3/hr withcurrent velocity 2.3 - 5.1 cm/s. Results showed that the functions of respirationrate for correlation between respiration of E. cromileptes and their weight wasy = 0.0065x + 0.1202 meanwhile the functions of optimum stocking density wasY = 1170.7 X -0.5648. On basis of dissolved oxygen budged, estimated optimum stocking density for lower limit was 128 ind/m3 for fish 50 g in average, 60 ind/m3 for fish 200 g and 21 ind/m3 for fish up to 1200 g.
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