KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...
KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...
KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...
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— 294 —<br />
Time (months)<br />
• Treatment I -■— Treatment II<br />
Fig. 10. — Fluctuation of ammonium concentration in intensive culture system.<br />
Time (months)<br />
—•—Treatment I —■—Treatment II<br />
Fig. 11. — Fluctuation of P-PQ, ' (ppm) concentrations in the intensive culture system o f climbing<br />
perch.<br />
values were lower than fluctuation of COD (14.04-16.82 ppm) and average of<br />
COD (14.04 ± 1.2 ppm) in treatment II. According to V in b e r g (1962), these<br />
values were shown as highly nutrient in earthen ponds.<br />
Regarding the H2S parameters, figure 13 shows that the fluctuation of H2S in<br />
treatment I ranged from 0.02 to 0.14 ppm, the average of H2S concentrations was<br />
0.02 ± 0.01 ppm. These values were lower than treatment II of 0.05-0.19 ppm<br />
(fluctuation of H2S) and 0.05 ± 0.02 ppm (average of H2S) but with no significant<br />
difference (p > 0.05) between both treatments. However, climbing perch