Classification

Temperature

DO21

pH

NH32

Salanity (ppt)

SD
5
15
25

N.S.
26.7 ± 0.4
26.9 ± 0.4
26.8 ± 0.4

**
6.7 ± 0.1a
6.0 ± 0.1b
4.8 ± 0.2c

N.S.
8.6 ± 0.2
8.6 ± 0.1
8.6 ± 0.3

**
0.04 ± 0.001c
0.06 ± 0.001b
0.08 ± 0.002a

N.S
45.5 ± 0.2
45.4 ± 0.1
45.6 ± 0.3

WER
10%
20%

N.S.
27.0 ± 0.4
26.6 ± 0.4

**
5.4 ± 0.2b
6.2 ± 0.1a

*
8.7 ± 0.1b
8.6 ± 0.1a

*
0.06 ± 0.003a
0.05 ± 0.004b

*
46.2 ± 0.1a
44.7 ± 0.1b

SDxWER

N.S.

**

N.S.

**

N.S.

Means (+SE) in the same column having the same superscripts are not significantly different (p<0.05).
Significant level: N.S.=P>0.05, *=P≤0.05, ** P≤0.01. Water exchange rate=WER
1DO2=Dissolved oxygen, 2NH3=Unionized Ammoni
Table 2: Water temperature, water salinity, dissolved oxygen (DO2), pH and un-ionized ammonia (NH3) for earthen grow-out ponds stocked with shrimp (P.semisulcatus) post-larvae at three stocking densities and two rates of water exchange (WER).
Goto home»