Changes of fish assemblages after construction of an estuary barrage in the lower Nakdong River, South Korea

Yoon, Ju-Duk; Jang, Min‐Ho; Jo, HyunBin; Jeong, Kwang-Seok; Kim, Gu-Yeon

doi:10.1007/s10201-015-0476-1

Cited by 22 publications

(19 citation statements)

References 21 publications

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“…This has made large areas of habitat less suitable for obligatory estuarine species, which were once found as far as 15 km further upstream. This type of altered river ecology has been documented in other coastal rivers where tidal barrages not only act as physical barriers to fish movement, but they also alter the original ecosystem of the estuary (Yoon et al 2016).…”

Section: Discussionmentioning

confidence: 79%

Assessment of a vertical slot fishway in south‐eastern Australia designed to pass numerous species and size classes of fish

O’Connor

Pickworth

Fanson

et al. 2019

Eco Management Restoration

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Summary In the Barwon River, Australia, a tidal barrage formed a major impediment to fish movement so in 2013 a vertical slot fishway was installed. The assessment of fishways on tidal barriers is rare in Australia so to ensure the fishway was achieving its ecological objective (i.e. successfully passing the target size range of fish of 20–400 mm total length), fish were trapped at the entrance and exit on 12 occasions and the species composition, abundance and length of fish at the two locations were compared. Additionally, a section of the river downstream of the fishway was sampled to ensure fishway trapping accurately reflected the species composition wanting to use the fishway to move upstream. Eighteen species and 69,246 individual fish were caught in the fishway traps. Catch rates between locations did not differ for Common Galaxias (Galaxias maculatus) or Australian Smelt (Retropinna semoni), although species‐specific catch rates were lower at the exit for Flat‐headed Gudgeon (Philypnodon grandiceps), Tupong (Pseudaphritis urvillii) and Yellow‐eye Mullet (Aldrichetta forsteri). Length distribution between locations only differed for Australian Smelt with small fish under‐represented at the exit location (<25 mm total length). Eight species of fish were collected downstream of the fishway that were not collected in it; however, all of these were estuarine dependent except the non‐native Common Carp (Cyprinus carpio). Our results indicate that vertical slot fishways are a suitable design for improving river connectivity at a low head, tidal barrages in south‐eastern Australia. The study reiterates the importance of reinstating connectivity for species with obligate marine/freshwater migratory life history traits, and the indirect benefits of increased productivity made available to upstream areas.

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Section: Discussionmentioning

confidence: 79%

Assessment of a vertical slot fishway in south‐eastern Australia designed to pass numerous species and size classes of fish

O’Connor

Pickworth

Fanson

et al. 2019

Eco Management Restoration

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“…However, their structure frequently disrupts the river continuum and interrupts the transportation of organic matter, consequently changing water quality in a negative way (Wei et al, 2009). Further, because the connectivity of watersheds is crucial for fishes, the fragmentation of aquatic habitats frequently results in their extirpation (Sheer and Steel, 2006;Yoon et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Changes in particulate organic matters and plankton populations in nature-like fishways: role of nature-like fish ways in water treatment

Hwang

Seo

Yoon

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Nature-like fishways, designed to mimic a small natural stream, have been widely used in river restoration projects as well as in rivers with dams and weirs. Because they are built with diverse natural materials similar to those in natural streams, we aimed to estimate the self-purification ability of nature-like fishways. Monthly sampling was conducted at inlet and outlet points of two nature-like fishways in Korea: the Baekjae and Sejong fishways. Two artificial fishways and main river channels were also evaluated to be used as references. Suspended solids (SS), chlorophyll a (Chl. a), and plankton abundances were measured. A significant reduction in plankton abundances and decrease in SS and Chl. a were observed in nature-like fishways, and no significant changes were observed in concrete artificial fishways and main river channels. In Baekjae and Sejong fishways, average 28.2% and 14.9% of the SS concentrations were reduced, respectively. The Chl. a concentration also significantly decreased (44.8% and 29.8% in Baekjae and Sejong fishways, respectively). A decreasing pattern was more apparent in the Baekjae fishway, which is longer and has a slower water velocity. The rate of decrease was higher when SS and Chl. a concentrations were high at the inlet points. Thus, we confirmed that particulate organic matters could be reduced in nature-like fishways. However, the direct cause and purification process mechanisms in them could not be clearly identified. Further studies should examine the biological and chemical mechanisms in fishways, allowing us to estimate their capacity for self-purification.Keywords: self-purification / phytoplankton / zooplankton / suspended solid / chlorophyll a Résumé -Changements dans les matières organiques particulaires et les populations de plancton dans les passes de type « rivière artificielle » : rôle des passes de type « rivière artificielle » dans la qualité de l'eau. Des passes de type « rivière artificielle », conçues pour imiter un petit ruisseau naturel, ont été largement utilisées dans les projets de restauration des rivières ainsi que dans les rivières avec barrages et seuils. Parce qu'elles sont construites avec divers matériaux naturels semblables à ceux des cours d'eau naturels, nous avons cherché à estimer l'aptitude à l'auto-épuration des passes de type « rivière artificielle ». Des échantillonnages mensuels ont été effectués aux points d'entrée et de sortie de deux passes de type « rivière artificielle » en Corée : les passes à poissons Baekjae et Sejong. Les deux passes artificielles et les secteurs principaux de rivières ont également été évalués pour servir de référence. On a mesuré les solides en suspension (SS), la chlorophylle a (Chl. a) et les abondances du plancton. Une réduction significative de l'abondance du plancton et une diminution des SS et de Chl. a ont été observées dans les passes de type « rivière artificielle » et aucun changement significatif n'a été observé dans les passes artificielles et les secteurs principaux de la rivière. Dans ...

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“…Dam operations that are more focused on the social requirement for freshwater resources may result in a decrease of the supporting functions in the estuary ecosystem by manipulating the salinity levels that affect the growth of primary producers (Cloern & Jassby, 2012). Our results showed a negative influence of regulated dam discharge as the current dam operation in the Nakdong River Estuary mainly focuses on economically important species (e.g., Pyropia spp., migratory fish; Yoon et al, 2016) and social risk reduction. On the basis of our simple estimate using linear regression (Figure 4a), freshwater discharge during the early growing season of tuberous bulrush should be maintained at more than 3000 × 10 6 tons of water to secure an optimal salinity range (<15 ppt; Kim et al, 2016) in the Nakdong River Estuary.…”

Section: Discussionmentioning

confidence: 99%

Effects of regulated dam discharge on plants and migratory waterfowl are mediated by salinity changes in estuaries

Kim

2020

Internat Rev Hydrobiol

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The rapid increase in dam construction has resulted in a worldwide loss of natural river flows. Regulated dam discharge into estuaries can interrupt the spatiotemporal occurrence of brackish communities adapted to optimal salinity ranges, further threatening biodiversity and ecosystem function in the affected regions. We used annual survey records from the Nakdong River Estuary from 2009 to 2018 to identify the indirect effect of regulated dam discharge on plants and migratory waterfowl. Increased mean salinity during the spring season negatively influenced the area covered by plants and the number of days on which swans were present during winter. Moreover, the mean salinity during the early growing periods of plants providing food to waterfowl was regulated by the amount of freshwater discharge from the estuarine barrage rather than by the direct effect of precipitation. Conservation managers should consider the amount of dam discharge and the salinity conditions during spring to maintain sufficient food resources and supporting functions for migratory waterfowl in the estuary. Our study highlights the need for a comprehensive assessment of time‐lag effects to minimize the negative impacts resulting from regulated dam discharge.

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Changes of fish assemblages after construction of an estuary barrage in the lower Nakdong River, South Korea

Cited by 22 publications

References 21 publications

Assessment of a vertical slot fishway in south‐eastern Australia designed to pass numerous species and size classes of fish

Assessment of a vertical slot fishway in south‐eastern Australia designed to pass numerous species and size classes of fish

Changes in particulate organic matters and plankton populations in nature-like fishways: role of nature-like fish ways in water treatment

Effects of regulated dam discharge on plants and migratory waterfowl are mediated by salinity changes in estuaries

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