The abundance and diversity of phosphate-solubilizing bacteria in integrated recirculating aquaculture systems as a function of harvesting regime of duckweed (Lemna minor L.)

Dahlia, Dahlia and Ardiansyah, Ardiansyah and Indrayani, Indrayani and Jabbar, Firmasyah (2021) The abundance and diversity of phosphate-solubilizing bacteria in integrated recirculating aquaculture systems as a function of harvesting regime of duckweed (Lemna minor L.). AACL Bioflux, 14 (5). pp. 3055-3067. ISSN 1844-9166 (online); ISSN 1844-8143 (print)

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Abstract

The present study aimed to determine the effects of different harvesting regimes of duckweed (Lemna minor Linnaeus) on the abundance and diversity of phosphate-solubilizing bacteria (PSB) in integrated recirculating aquaculture systems (IRAS). The study was conducted in twelve independent IRAS, where four duckweed harvesting regimes of two, four, and six-day harvest intervals tested the abundance and diversity of PSB. After 36 days, ten selected isolates belonging to five different genera were biochemically characterized. These isolates and their respective genera were: PSB1, PSB3, and PSB7 belonging to Bacillus, PSB17, and PSB26 to Pseudomonas, and PSB15, PSB29, PSB30, PSB32, and PSB35 to Chryseobacterium, Micrococcus, Azotobacter, Acinetobacter, and Achromobacter, respectively. In vitro, Bacillus cereus had higher solubilization efficiency and phosphatase activity. Duckweed harvested once every two days produced the highest duckweed biomass, however, harbored fewer bacteria, while six days of harvesting generated the highest duckweed growth index but lower bacterial diversity than the duckweed harvested every four days. The highest Shannon diversity index was obtained with a four-day harvest regime, while the lowest was when the duckweed was not harvested. A positive correlation (R2 > 0.65) between the specific growth rate (SGR) and biomass of harvested duckweed and the diversity of PSB was found with a four-day harvest regime. Harvesting duckweed every four days provides desirable conditions for the attachment and growth of bacteria, thus increasing the abundance and diversity of PSB. These findings suggest the efficiency of removing excessive phosphorus and the associated PSB by duckweed and increase the productivity of IRAS.

Item Type:	Article
Subjects:	FAKULTAS TEKNIK FAKULTAS TEKNIK > Pendidikan Teknologi Pertanian
Divisions:	FAKULTAS TEKNIK
Depositing User:	Dr. Indrayani Indrayani
Date Deposited:	02 May 2023 04:32
Last Modified:	02 May 2023 04:32
URI:	http://eprints.unm.ac.id/id/eprint/28071

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