Seasonal changes in water quality and Sargassum biomass in southwest Australia

Hoang, Tin; Cole, Anthony J.; Fotedar, Ravi; O’Leary, Michael J.; Lomas, Michael W.; Roy, Shovonlal

doi:10.3354/meps11735

Cited by 31 publications

(18 citation statements)

References 47 publications

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“…In Cancun, Mexico alone, the authorities estimate that the cleaning of each meter of coastline could range as high as a $1000.00. They have budgeted almost $10 million and hired approximately 5000 temporary workers to remove the seaweed that engulfed the Caribbean coast of Mexico (Hoang et al, 2016). The island of Tobago has even declared a state of natural disaster (http://ambergriscaye.com/forum/ubbthreads.php/topics/ 506881/the-journey-of-the-sargassum.html).…”

Section: Potential Impacts Of the Sargassum Invasionmentioning

confidence: 99%

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<i>Sargassum</i> Invasion of Coastal Environments: A Growing Concern

Louime¹,

Fortune²,

Gervais³

2017

American Journal of Environmental Sciences

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Floating tropical brown macroalgae, commonly called Sargassum, besieging the Caribbean coastlines have long been a regular occurrence in the region, especially during the fall and winter months. These washed-up seaweeds are considered by scientists as an important part of the coastal ecosystem, as they serve as habitat and nurseries for numerous marine species. However, in recent years, the region has seen an explosion in Sargassum densities with unusually high extent and frequency. This natural catastrophe, as some label the 2013 invasion, has even crossed the Atlantic Ocean to reach the west coast of Africa. Some scientists have linked this disaster with global climate change and the concomitant higher than normal temperatures. Now the question is being raised as to whether the latest seen invasion of Sargassum represents a seasonal anomaly or a regime shift in ocean currents and climate. Therefore, it is urgent for the scientific community to understand the causes of these recent occurrences and provide potential remedial solutions, as these invasions could have significant negative impacts on marine ecosystems, even disrupting entire economic activities of local communities.

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Section: Potential Impacts Of the Sargassum Invasionmentioning

confidence: 99%

“…Cleanup efforts by work crews may also worsen beach erosion. In addition, the decomposition of algae may lead to the alteration of water chemistry which subsequently causes the death of certain fish species susceptible to falling oxygen levels (Hoang et al, 2016).…”

Section: On the Environmental Frontmentioning

confidence: 99%

<i>Sargassum</i> Invasion of Coastal Environments: A Growing Concern

Louime¹,

Fortune²,

Gervais³

2017

American Journal of Environmental Sciences

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“…The levels of dissolved oxygen (DO) in water was monitored by digital DO meter (YSI55; Perth Scientific, Australia). The concentrations of nitrate (NO 3 − ) and nitrite (NO 2 − ) were checked using Hach DR/890 Colorimeter (Hach, Loveland, CO, USA) following the method of cadmium reduction and diazotization (Hoang et al, 2016). Phosphate (PO 4 − ) level in water was examined by ascorbic acid standard 4500-PE method, as described by Huong (Mai, Fotedar & Fewtrell, 2010).…”

Section: Methodsmentioning

confidence: 99%

Marked variations in gut microbiota and some innate immune responses of fresh water crayfish, marron (Cherax cainii, Austin 2002) fed dietary supplementation of Clostridium butyricum

Foysal

Nguyen

Chaklader

et al. 2019

PeerJ

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This study aimed to investigate the effects of Clostridium butyricum as a dietary probiotic supplement in fishmeal based diet on growth, gut microbiota and immune performance of marron (Cherax cainii). Marron were randomly distributed into two different treatment groups, control and probiotic fed group. After 42 days of feeding trial, the results revealed a significant (P < 0.05) increase in growth due to increase in number of moults in marron fed probiotics. The probiotic diet also significantly enhanced the total haemocyte counts (THC), lysozyme activity in the haemolymph and protein content of the tail muscle in marron. Compared to control, the 16S rRNA sequences data demonstrated an enrichment of bacterial diversity in the probiotic fed marron where significant increase of Clostridium abundance was observed. The abundance for crayfish pathogen Vibrio and Aeromonas were found to be significantly reduced post feeding with probiotic diet. Predicted metabolic pathway revealed an increased activity for the metabolism and absorption of carbohydrate, degradation of amino acid, fatty acid and toxic compounds, and biosynthesis of secondary metabolites. C. butyricum supplementation also significantly modulated the expression level of immune-responsive genes of marron post challenged with Vibrio mimicus. The overall results suggest that C. butyricum could be used as dietary probiotic supplement in marron aquaculture.

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“…The dissolved oxygen (DO) concentration was measured using digital DO meter (YSI55, Perth Scientific, Australia). The concentration of nitrate and nitrite in water were monitored using Hach DR/890 Colorimeter (Hach, Loveland, CO) after following cadmium reduction and diazotization method (Hoang et al 2016). Phosphate (PO 4 -) concentration in water was measured by ascorbic acid 4500-PE method, as previously described (Mai et al 2010).…”

Section: Water Quality Analysismentioning

confidence: 99%

Biological ball filters regulate bacterial communities in marron ( Cherax cainii ) culture system

Foysal

Fotedar

Gupta

et al. 2019

Lett Appl Microbiol

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This study aimed to characterize the bacterial communities in rearing water treated with commercial plastic biological ball filters named as Bio‐ball in marron culture for 60 days. Inclusion of Bio‐ball in the aquaculture tanks showed improvement in water quality parameters and enrichment of bacterial communities in terms of operational taxonomic units. The water treated with Bio‐ball showed significantly less nitrate, nitrite, ammonia, phosphorus and high dissolved oxygen concentration than untreated control group. At phylum level, Proteobacteria was dominant in both control and treated water, whereas Firmicutes was found to be significantly (P < 0·05) enriched in Bio‐ball treated water. Among the classified genus, Aquabacterium and Polunucleobacter were most dominant in control and Bio‐ball treated water respectively. Linear Discriminant Analysis Effect Size exhibited 31 indicator bacterial genus, 10 in control and 21 in treated condition, suggesting the enrichment of microbial lineages with addition of Bio‐ball. The bacteria Haliscomenobacter, Hypnocyclicus, Pajaroellobacter and Vibrio were found to be significantly (P < 0·001) correlated with higher pH, nitrate, nitrite, phosphorus and ammonia in control tanks, whereas Corynebacterium was linked to higher temperature in treated water. Overall results suggest that Bio‐ball filter media significantly improved the water quality and microbial populations in aquaculture tanks. Significance and Impact of the Study The results of this study revealed the positive impacts of Bio‐ball in enrichment of microbial flora associated with the degradation process of nitrogenous and organic compounds. Bio‐ball also showed the capability to prevent the colonization of harmful bacteria, and favoured the growth of beneficial microbes in aquatic system. This study therefore could pave the ways of increasing the aquaculture production by improving the water quality.

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Seasonal changes in water quality and Sargassum biomass in southwest Australia

Cited by 31 publications

References 47 publications

<i>Sargassum</i> Invasion of Coastal Environments: A Growing Concern

<i>Sargassum</i> Invasion of Coastal Environments: A Growing Concern

Marked variations in gut microbiota and some innate immune responses of fresh water crayfish, marron (Cherax cainii, Austin 2002) fed dietary supplementation of Clostridium butyricum

Biological ball filters regulate bacterial communities in marron ( Cherax cainii ) culture system

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