International Journal of Aquaculture, 2017, Vol.7, No.21, 134-138
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Figure 2 The ability to survive on the ropes stretch during culture period
Figure 3 (a) Absolute growth during the research period (40 days); (b) Carrageenan content found the research period (40 days)
3.2 Growth rate and carrageenan quality
During the culture period of the research, shown that the low growth occurred in all treatments due to the low
nutrient content especially the phospat and nitrate in the water event some time the phosphate was undetected. The
water quality measured during the study period is shown in (Table 1). The effect epiphyte and ice-ice infection on
seaweed can depress its growth. Data observation shows that it is tendency the lower growth of the seaweed
infected by epiphyte and ice-ice compare to control (Figure 3a). The result of the research shown that there was no
significant different of effect of parasite epiphyte and ice-ice disease on the quality of carrageenan (Figure 3b).
This is due to the proportion of thallus infected by such diseases the carrageenan conten only 1 percent of the
whole thallus (Mendoza et al., 2003). According to Breden and Bird (1994) the carrageenan content mostly
effected by environments such as irradiation, water temperature, and N content in the water. Irradiance and water
temperature affected thallus substratum coverage and water gel strength of the carrageenan. N-enriched cultures
showed decreased gel yields, higher viscosities and higher water gel strengths in the carrageenan extracted from
these cultures. The present study shows that the N content (NO
3
form) of the water was low (Table 1).
Table 1 The water quality measured during the study period (SD = 0.058819)
No.
Time
Parameters
PO
4
(ppm)
NO
3
(ppm)
1
Day 0
undetected
0.005
2
Day 10
0.31
0.170
3
Day 20
0.36
0.087
4
Day 30
undetected
0.082
5
Day 40
undetected
0.070
