MICROALGAE ASSESSMENT AS ARTIFICIAL FEED IN COMMON CARP (Cyprinus carpio, L) NURSERY GROWTH FROM BOJONGSOANG WASTE WATER TREATMENT PLANT-PDAM, BANDUNG DISTRICT

• Main Author: Ariebowo, Moekti
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/34766
• Institution: Institut Teknologi Bandung

Bojongsoang-Bandung waste water treatment plant (Instalasi Pengolahan Air Limbah/IPAL) is an installation for liquid waste processing for City of Bandung. Organic compounds from this household wastes has become nutrients source that supports microalgae growth. Microalgae in IPAL ponds are dominated by Spirulina sp. which has high protein content. The purpose of this research is to study the potential of microalgae abundance in Bojongsoang IPAL ponds as fish artificial feed resource; to identify the formulation of fish artificial feed from Bojongsoang IPAL ponds’ microalgae utilization for common carp (Cyprinus carpio, L.) nursery; and to identify the potential of economic value of this microalgae utilization for Bojongsoang Area. The research was done in four stages: microalgae composition analysis in IPAL ponds, microalgae nutrition analysis and artificial feed formulation calculation, artificial feed test for carps in laboratory, and socio-economic analysis for local community. Laboratory analyses were performed on microalgae samples, proximate nutrition contents, and water physical-chemical condition for the following parameters: NO2, NO3, PO4 and heavy metal Lead (Pb). Three types of artificial feed (Formula A, Formula B and Commercial Feed as control) were tested on 10 individuals of carps/aquarium, repeated three times. Statistic analysis one way ANOVA with Tukey-HSD test were conducted to know the effect of artificial feed to fish total biomass gain. The results showed that the composition of microalgae in the IPAL ponds dominated by Spirulina sp. (670,913 ind/L) and Mycrocystis sp. (358,457 ind/L). Obtained dry weight of microalgae is 9.8 g/m2 with protein content iv 61.50%, fat 7.71% and fibers 11.83%. Protein content in Formula A is 34.44%, in Formula B 34.06% and in commercial feed 28-30%. Fish biomass gain on six days nurturing showed that there is no significance difference (p>0.05) between three systems with average total biomass of fish for Formula A 33.93±0.93 g, Formula B 33.94±1.11 g and commercial feed 33.44±1.14 g. Observation on water chemical condition on aquariums showed no significance differences (p>0.05) between measured parameters nitrate, nitrite and phosphate. There are 15 respondents which interviewed, 53.3% of them willingly to try the new artificial feed formula, and 47.7% are not because of their tradition and habits on carps nurturing on Bojongsoang Area. From the economic study, the production cost for Formula A is Rp 3,500/kg, Formula B is Rp 4,506/kg and commercial feed cost Rp 6,000/kg with potential of production cost reduction every month per hectare is Rp 466,000 – Rp 577,250. The conclusion from this research is that the microalgae in Bojongsoang IPAL ponds can be used as alternative source of artificial feed with high protein content, which would help the development of common carp nurturing industry in Bojongsoang Area.