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Utilization of Phytoplanktivorous Fishes for Counteracting Eutrophication
Published in Karol Opuszynski, Jerome V. Shireman, HERBIVOROUS FISHES: Culture and Use for Weed Management, 2019
Karol Opuszynski, Jerome V. Shireman
Promising results from using silver carp to improve water quality were obtained in a mesocosm experiment in Paranoá Reservoir, Brazil.662 This large reservoir (4000 ha) was built in 1959 to provide water to the city of Brasilia. Water quality in the reservoir was deteriorating due to increased eutrophication and excessive algal blooms, caused mostly by a blue-green alga, Cylindrospermopsis raciborskii. The impact of fishes was compared in polyethylene cylinders that completely isolated a 2-m3 column of water and were open to the atmosphere, but closed to the sediments. Four species of fishes were compared: Congo tilapia, bluegill, tambaqui (Colossoma macropomum), and silver carp. The first two species inhabited this reservoir, and the remaining two were recommended for introduction. C. raciborskii, which constituted 98% of the phytoplankton biomass during the experiments, was increased when bluegill, tilapia, and tambaqui were present, but significantly reduced by the presence of silver carp. In another mesocosm experiment conducted in Paranoá Reservoir,663 bottomless tanks were dug about 30 cm into the soft bottom and stocked with silver carp. A decrease in net phytoplankton (>20 μm) abundance, total phytoplankton biomass, and net primary production occurred, but C. raciborskii numbers were not reduced.
Cyanobacteria, water quality and public health implications: a systematic scoping review
Published in Australasian Journal of Water Resources, 2023
Jack Grentell, Ripon Kumar Adhikary, Aparna Lal
In Australia, three major toxic cyanobacteria exist: DolichospermumDolichospermum circinalis, Cylindrospermopsis raciborskii and Microcystis species. Because of these species’ dominance, they are identified as major points of intervention, to prevent bloom formation and the subsequent prsdsfoduction of substantial levels of cyanotoxins. These cyanotoxins include cylindrospermopsins, microcystins, nodularins and various neurotoxins, and are predominantly recognised for their hepatotoxicity and neurotoxicity, though can have a broad range of harmful systemic effects (NHMRC 2011). While there are cyanobacteria-specific guidelines and thresholds for recreational contact and drinking water, the development of context-specific, early warning risk management strategies for public health remains a challenge. In this context, this paper aims to systematically review the Australian peer-reviewed literature on cyanobacteria growth and bloom formation. Through this review, we provide a critical assessment of the current challenges and research opportunities for timely risk management. We start by examining the water quality and nutrient predictors for cyanobacteria occurrence, the implications of the spatial distribution and waterbodies across which this research has been conducted for public health, followed by a final section on recommendation to managers to optimise monitoring, with a focus on early warning systems.
Quantifying the role of organic phosphorus mineralisation on phytoplankton communities in a warm-monomictic lake
Published in Inland Waters, 2019
Matthew J. Prentice, David P. Hamilton, Anusuya Willis, Katherine R. O'Brien, Michele A. Burford
Lake Wivenhoe (27°23′38″S; 152°36′28″E) is a warm-monomictic reservoir in southeast Queensland, Australia. The climate of the region is subtropical, with a mean monthly rainfall of 75 mm in summer and 34 mm in winter (Burford and O’Donohue 2006). The lake has a watershed area of 7020 km2, comprising ∼50% forested and 50% agricultural land used primarily for cattle grazing (Leigh et al. 2015). It receives input water from an upstream dam (Somerset Reservoir), the Upper Brisbane River, and via a pumpback hydroelectric power station (Splityard Creek; Gibbes et al. 2009, O'Brien et al. 2016). At full water storage capacity the lake has a volume of 1 165 000 ML, area of 107 km2, and mean depth of 10.7 m (Leigh et al. 2015). The lake stratifies during the summer wet season (austral summer, Oct–May). The phytoplankton community is generally dominated by bacillariophytes and chlorophytes during winter and by cyanobacteria, including the toxic Raphidiopsis raciborskii (previously Cylindrospermopsis raciborskii), during summer (Burford and O’Donohue 2006, Muhid et al. 2013).
Cyanobacteria mediated heavy metal removal: a review on mechanism, biosynthesis, and removal capability
Published in Environmental Technology Reviews, 2021
Abdullah Al-Amin, Fahmida Parvin, Joydeep Chakraborty, Yong-Ick Kim
Although cyanobacteria mediated heavy metal removal is an effective method, still some limitations exist on this method. It is important to note that cyanobacteria-mediated metal removal processes are slower than traditional chemical processes [33,101,102,119]. Further, cyanobacteria can also present a threat to the indigenous aquatic ecosystem, as some cyanobacterial species are toxic [120]. Hence, before deploying cyanobacteria strategically, one needs to carefully identify toxic species such as Anabaena circinalis, Cylindrospermopsis raciborskii, Microcystis aeruginosa, Planktothrix sp., and Nodularia spumigena CCY 9414 [121]. The safe way of using toxic cyanobacteria is by making them dead by optimizing temperature [122].