Bacterial microbiome dynamics in commercial integrated aquaculture systems growing Ulva in abalone effluent water
In South Africa, the green seaweed Ulva lacinulata is grown in land-based integrated multi-trophic aquaculture (IMTA) farms with the abalone Haliotis midae . The Ulva serves as a biofilter and the co-produced Ulva is often used as feed for the abalone. To better understand the potential benefits and...
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Veröffentlicht in: | Journal of applied phycology 2024-10, Vol.36 (5), p.2823-2849 |
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Sprache: | eng |
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Zusammenfassung: | In South Africa, the green seaweed
Ulva lacinulata
is grown in land-based integrated multi-trophic aquaculture (IMTA) farms with the abalone
Haliotis midae
. The
Ulva
serves as a biofilter and the co-produced
Ulva
is often used as feed for the abalone. To better understand the potential benefits and risks associated with this practice, this study characterised the bacterial microbiome associated with the seawater and
Ulva
raceways receiving abalone effluent (IMTA system) and compared this to
Ulva
tanks supplied with fertilised seawater (non-IMTA; control).
Ulva
samples were collected from each
Ulva
system, and water samples were collected at the inlet and outlet of each system. Bacterial communities were assessed using a culture-based approach and next-generation sequencing (NGS) of the V3-V4 16S rDNA region. It was observed that
Ulva
has the potential to reduce the bacterial load of abalone effluent, with the total number of potential culturable
Vibrio
species declining from 150×10
3
cells mL
-1
in the inlet to 37×10
3
cells mL
-1
in the outlet of the
Ulva
system. The NGS dataset supported these findings, with a reduction observed in
Vibrio
and
Pseudoalteromonas
from the inlet to outlet samples. A lower number of genera (
p
< 0.05) were observed on
Ulva
when compared with water samples, indicating that
Ulva
has a beneficial, modulatory effect on bacteria. These findings contribute towards the growing body of evidence for the benefits of seaweeds in IMTA and addresses the biosecurity concerns of abalone farmers wishing to improve the circularity of their farming activities by incorporating seaweeds. |
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ISSN: | 0921-8971 1573-5176 |
DOI: | 10.1007/s10811-024-03298-8 |