International Journal of Aquaculture, 2017, Vol.7, No.13, 86-93
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The best growth of periphyton was observed on bamboo, followed by ambay and leucaena. In Experiment 1,
periphyton biomass on bamboo substrate was 1.12±0.16 as against 0.95±0.13 and 0.87±0.11 mg/cm² of ambay
and leucaena. In Experiment 2, the values were 1.43±0.22, 1.22± 0.14 and 0.98±0.16 mg/cm² respectively (Table
3). Periphyton protein and fat contents of bamboo, ambay and leucaena periphyton were 24.42% and 22.18%,
21.63% and 2.35%, 1.87% and 1.93% respectively on dry weight basis (Table 4). Bamboo periphyton had 39.59
µg/cm
2
chlorophyll-a, while its value was 35.15 µg/cm
2
and 32.76 µg/cm
2
in ambay and leucaena periphyton.
Zooplankton in bamboo periphyton consisted of chironomids, ostracods, nematomorphs, oligochaetes, rotifers and
calanoids, chironomids being predominant. Hydra, Ephemeroptera and Trichoptera were also encountered.
Ambay periphyton lacked calanoids, Ephemeroptera and Trichoptera, whereas leucaena periphyton did not show
Hydra. Zooplankton population in bamboo periphyton was 2 and 3 times higher than that of ambay and leucaena
respectively. Phytoplankton population of periphyton belonged mainly to the families Chlorophyceae,
Cyanophyceae, Bacillariophyceae and Chrysophyceae.
Jaraqui attained final av. length of 11.23±0.69 cm and av. wt. of 34.34±2.05 g under bamboo substrate, whereas
the respective values were lower in ambay (10.14±0.52 cm and 29.85±1.71 g) and leucaena (9.21±0.25 cm and
24.38±1.65 g) treatments. In contrast, control fish reached av. length of 9.02±0.17 cm and av. wt. of 19.44±1.12 g
(Table 5).
Table 3 Periphyton biomass (mg/cm²) (mean ± SD) on different substrates
Day
Bamboo
Ambay
Leucaena
Experiment 1
15
0.54±0.09ª
0.47±0.02ª
0.41±0.04
b
30
1.02±0.16
b
0.89±0.13
a
0.84±0.08
a
45
1.80±0.12
b
1.49±0.11
a
1.36±0.14
a
Mean
1.12± 0.16
0.95±0.13
0.87±0.11
Experiment 2
15
0.55±0.13ª
0.45±0.098
a
0.41±0.04
a
30
45
0.98±0.14ª
1.06±0.38ª
0.76±0.07
a
0.99±0.14
b
0.62±0.11
b
0.86±0.17
b
60
1.14±0.45ª
1.02±0.32ª
1.18±0.19
a
75
1.40±0.37
1.80±0.68ª
1.04±0.25ª
90
1.86±0.46ª
1.63±0.24ª
1.54±0.42ª
105
2.92±0.68
b
1.74±0.21
a
1.02±0.35ª
120
1.53±0.49
a
1.37±0.32
a
1.17±0.26ª
Mean
1.43
± 0.22
1.22 ± 0.14
0.98± 0.16
Note: Values with the same superscript in each row are not statistically different (P> 0.05)
Table 4 Average proximate composition of periphyton (dry weight basis) (mean ± SD) from different substrates (Experiment 2)
Parameter
Bamboo
Ambay
Leucaena
Moisture (%)
8.17±0.67
a
9.23±0.36
a
8.58±0.72
a
Protein (%)
24.42±0.83
b
22.18±1.02
a
21.63±0.92
a
Lipid (%)
2.35±0.32ª
1.87±0.21
a
1.93±0.28
a
Ash (%)
11.78±0.76
a
12.85±0.98
a
13.42±1.27
a
NFE (%)
53.28
53.87
54.44
Gross Energy (kcal/100g)
356.37
342.86
343.28
Note: Values with the same superscript in each row are not statistically different (P>0.05)
