Aquaculture Reports· 2026Q1
Role of phycospheric bacteria: Promoting the growth of Isochrysis zhanjiangensis and ammonia nitrogen removal in rearing water
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- Q1SCImago
- 2026year
Short summary
Two phycospheric bacteria, Alteromonas abrolhosensis and Halomonas piezotolerans, isolated from Isochrysis zhanjiangensis, significantly enhanced algal growth and removed ammonia nitrogen in rearing water.
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Key points
- Alteromonas abrolhosensis increased I. zhanjiangensis cell density by 16.22% and chlorophyll a by 43.62% at 10⁸ cfu/mL.
- Halomonas piezotolerans increased soluble protein by 4.65% at 10⁶ cfu/mL.
- Both bacterial strains facilitated ammonia nitrogen removal from rearing water.
- Gene expression analysis revealed upregulation of nirB, nosZ, glnG, glnL, and glnA genes, supporting their roles in nitrogen transformation.
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Abstract
Isochrysis zhanjiangensis is crucial in the breeding of bivalves larval as an artificially cultivated feed microalga. To investigate their roles in algal–bacterial interactions, two phycospheric bacterial strains, Halomonas piezotolerans and Alteromonas abrolhosensis , were isolated from I. zhanjiangensis and examined their effects on algal growth and ammonia nitrogen removal in aquaculture systems. The results indicated that both strains promoted the growth of I. zhanjiangensis ; with the A. abrolhosensis showing the stronger effect. At a concentration of 10⁸ cfu/mL, the A. abrolhosensis treatment reached a cell density of 1.082 × 10⁷ cells/mL on day 10, 16.22% higher than the control ( p < 0.05). Chlorophyll a content in this group was 4.985 μg/L (a 43.62% increase vs. control; p < 0.05), and the total polysaccharide content was 8.366 g/L (a 59.90% increase; p < 0.05). H. piezotolerans at a concentration of 10⁶ cfu/mL increased the soluble protein by 4.65% ( p > 0.05), and promoted soluble p rotein synthesis at lower inoculation levels. In ammonia nitrogen removal experiments, H. piezotolerans exhibited more stable and pronounced activity, while A. abrolhosensis also contributed to nitrogen reduction. Quantitative PCR (qRT-PCR) showed upregulation of nirB and nosZ genes in H. piezotolerans , and increased expression of nirB , glnG , glnL , and glnA in A. abrolhosensis , supporting their potential roles in ammonia nitrogen transformation. This study demonstrates that phycospheric bacteria isolated from I. zhanjiangensis promote algal growth and facilitate ammonia nitrogen removal during bivalves larval rearing. These results provide new insights into bacteria–algae interactions and indicate practical implications for enhancing algal productivity and maintaining environmental stability in hatchery systems.
The authors' abstract, as published at the source. Aquaculture Reports, 2026 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy