Effects of an anti-salt intrusion dam on tropical fish assemblages

Jutagate, Tuantong; Sawusdee, Amonsak; Thapanand-Chaidee, Thanitha; Lek, Sovan; Grenouillet, Gaël; Thongkhoa, Sutheera; Chotipuntu, Piyapong

doi:10.1071/mf08296

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…Saltwater intrusion is a major concern commonly found in estuaries around the world, therefore, several authors have been discussed the environmental impacts of saltwater intrusion in different estuaries, Such as [4][5][6][7][8][9] or on fish assemblages that inhabit coastal rivers, Such as [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Saltwater Intrusion on the Fish Assemblage in the Middle Part of Shatt Al-Arab River, Iraq

Mohamed

Hameed²

2019

AJAS

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In 2018, a serious changes in the salinity of the Shatt Al-Arab river, as salinity intrusion progressed further to upper reaches of the river due to sharply decline in river flow. Therefore, the fish assemblage structure in the middle of the river, fromÂ Sindbad and Abu Al-Khasibs was assessed during the period from January to December 2018. Fish were sampled by gill nets, cast net and electro-fishing from both sites. Salinity fluctuated from 2.0â€° (January) in both sites to 16.2 and 25.0% during August in both sites, respectively. 35 and 44 fish species were collected from both sites, respectively, these included 18 marine species in first site and 28 marine species in second site. Poecilia latipinna, Tenualosa ilisha and Oreochromis aureus were the dominant species in first site, whereas O. aureus, Carassius auratus and P. latipinna in second site. The index of species richness, diversity and evenness each showed a consistent seasonal pattern in both sites. The highest value of Bray-Curtis similarity index of fish species between both sites was noted during the period of low salinity. Findings indicate that the salinity values and the percentages of marine and occasional species were considerably higher than that documented in the previous studies on this part of the Â river.Â

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Section: Introductionmentioning

confidence: 99%

Impacts of Saltwater Intrusion on the Fish Assemblage in the Middle Part of Shatt Al-Arab River, Iraq

Mohamed

Hameed²

2019

AJAS

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“…Among the species caught, only one taxon exhibits true diadromy, the giant prawn Macrobrachium soenbergii . The remaining taxa are amphidromous species or marine visitors, entering the bay mostly for feeding [ 12 , 37 , 38 ]. Soe et al [ 39 ] reported that the fishes of the inner bay community tend to be plankton feeders, meanwhile the community in the outer bay is dominated by piscivores.…”

Section: Discussionmentioning

confidence: 99%

“…This is likely because secondary freshwater fishes were not moving near the bottom and being caught by traps, whereas gillnets capture some secondary freshwater fishes when a high volume of freshwater is discharged into the Bay [ 14 ]. It is unfortunate that there were no samples from December, since it was expected to yield a different cluster showing high %O of secondary freshwater fishes, as experienced in the nearby Pak Panang Bay during the peak of the northeast monsoon (NEM) period, i.e., December to January [ 37 , 38 ]. Cluster C was composed of samples from late NEM to the first monsoon transition (i.e., from February to April), when water temperature was rising.…”

Section: Discussionmentioning

confidence: 99%

Catch assemblages in the small-scale trap fishery with relation to hydrographic features of a tropical bay in the Gulf of Thailand

Sawusdee,

Pokavanich,

Koolkalya

et al. 2023

PLoS ONE

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Catches from the small-scale trap fishery in Bandon Bay, Suratthani, Thailand, were monitored from 14 sites around the Bay, then disturbance to aquatic communities and catch assemblage were examined. At the same time, the hydrographical features of the bay were surveyed. The study was conducted throughout 2019 except in December, when a tropical cyclone made sampling impossible. In total, 17,373 animals from 118 species or species groups of aquatic animals were collected. The main target of the fishery, blue swimming crab Portunus pelagicus, contributed about 10% of the total catch in terms of number; meanwhile, another crab, Charybdis affinis, was the most dominant species (41% of total). W-statistics of Abundance-Biomass Comparison curves ranged between -0.025 and 0.031, indicating light disturbance to the communities in this fishing ground. The catch assemblage, based on number in catch composition, were divided into three main clusters and six sub-clusters by using the self-organizing map (SOM) technique. The SOM results showed that the catch assemblages differed based largely on temporal variation. The hydrographic features of Bandon Bay at times exhibited a layered structure and had strong spatial variation. The bay’s current system was governed by motion of tidal currents; meanwhile, the circulation was governed by monsoonal wind and freshwater discharges. Tidal current was strong and ranged between approximately 0.6 m to 2.2 m. Water within the bay was always warmer than the outer sea. High water temperature was observed two times during the year: during monsoon transition 1 (April to May) and transition 2 (October). Salinity showed great spatial and temporal variation, differing by more than 5–10 ppt horizontally. It was possible to use these dynamic hydrological features of Bandon Bay to explain assemblage patterns of the trap-net catches.

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Freshwater Fish Diversity in Thailand and the Challenges on Its Prosperity Due To River Damming

Jutagate

Grudpan

Suvarnaraksha

2016

Aquatic Biodiversity Conservation and Ecosystem Services

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Thailand is among the countries that ranked top in freshwater fish diversity, of which 843 freshwater fish species, including 13 elasmobranch fishes, have been officially recorded. Presently, the integrity of freshwater fish community is threatened by many stressors from human activities, in particular the river damming. In this paper, we illustrate the impacts to freshwater fish diversity by various dam types in Thailand. The major serious impact of river damming is the blockage of fish migratory routes, both for the species that migrate within river system and migrate between the river and the sea. So far, there is no any fish passage that reveals the effective performance because it is difficult to deal with the many fish species, with various modes of swimming and water flow preferences, in a single designed fish passage. The consequent results are the extirpation of the migratory species and, then, changes in fish community structures. The mitigation measure of opening the sluice gates for a certain period is recommended. This measure is beneficial for the fish migrations both for the dams in the middle portion and lower portion, i.e., brackish area, of the river, which allows the fish to complete their life cycles and can manipulate the fish assemblage patterns.

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Effects of an anti-salt intrusion dam on tropical fish assemblages

Cited by 8 publications

References 30 publications

Impacts of Saltwater Intrusion on the Fish Assemblage in the Middle Part of Shatt Al-Arab River, Iraq

Impacts of Saltwater Intrusion on the Fish Assemblage in the Middle Part of Shatt Al-Arab River, Iraq

Catch assemblages in the small-scale trap fishery with relation to hydrographic features of a tropical bay in the Gulf of Thailand

Freshwater Fish Diversity in Thailand and the Challenges on Its Prosperity Due To River Damming

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