Freshwater fishes of Lower Guinean forest streams: Aquaculture heavily impacts the structure and diversity of communities

Amadi, Nioking; Petrozzi, Fabio; Akani, Godfrey C.; Dendi, Daniele; Fakae, B.B.; Luiselli, Luca; Pacini, Nic

doi:10.1016/j.actao.2017.07.001

Cited by 5 publications

(7 citation statements)

References 33 publications

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“…According to Russel et al 27 , Nile tilapia cause the extinction of native fish species by preying on eggs, fry and small fish of other species. On the other hand, the decrease in species richness can be influenced by aquaculture activity, such as water quality degradation, intensified competition, invasive species, and habitat fragmentation 11,[28][29][30] . Koto Panjang Reservoir was categorized as eutrophic, with level index values ranging from 4.6-5.2 31 .…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, there are serious threats to the original fish biodiversity in the downstream and upstream regions of the reservoir due to the dam of the hydroelectric power plant, such as sand mining in river, land use change and aquaculture activity with cages, which can affect the depth of river water, food availability, and breeding sites. Amadi et al 11 state that original biodiversity can be eroded by habitat degradation and alien species impact. Meanwhile, aquaculture heavily impacts the structure and diversity of local fish communities 12,13 .…”

Section: Introductionmentioning

confidence: 99%

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Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

et al. 2019

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The capture fishery sectors in the river and reservoir play an Background important role in the Indonesian economy through increased income and diversification of livelihoods. The present study was conducted to ascertain fish diversity and their distribution pattern in the upstream and downstream areas of Koto Panjang Reservoir, Riau Province-Indonesia.: Fish samples were collected for a period of 12 months using a Methods variety of fish nets at four sites; Koto Mesjid (KM) and Batu Bersurat (BB), located in the upstream area of Koto Panjang Reservoir and Rantau Berangin (RB) and Kuok (KK), located in the downstream area of Koto Panjang Reservoir. Data obtained were analyzed using standard taxonomic keys based on morphometric characters.: A total of 44 species belonging 19 families and 33 genera were Results recorded in the study area. Alpha diversity indices showed that fish diversity in this area was quite high (Shannon's index = 2.10 and Simpson-D = 0.21) and evenness was low (evenness H/S =0.19). The fish in KM and BB sites (upstream) were from eight and 11 families, respectively. In RB and KK sites (downstream), fish were from 16 and 15 families, respectively. In KM, BB, RB and KK sites, the dominant family was Cyprinidae, comprising 33.45%, 50.95%, 43.04% and 39.35% of all fish caught at each site, respectively. Exotic species, especially Nile tilapia, were 20.15%, 14.11%, 5.62%, and 5.34%, respectively. Some differences were also noted between the upstream and downstream reservoirs, with a slight increase in exotic species in the upstream reservoir over the study period (from 11.39% vs. 34.66%), corresponding to decrease of native species (from 88.61% vs. 65.34%).: The diversity and distribution of fish fauna were varied in Conclusions upstream and downstream areas of Koto Panjang Reservoir. The exotic species were found to be dominant in the upstream reservoir areas.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

et al. 2019

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“…On the other hand, there are serious threats to the original fish biodiversity in the downstream and upstream regions of the reservoir due to the dam of the hydroelectric power plant, such as sand mining in river, land use change and aquaculture activity with cages, which can affect the depth of river water, food availability, and breeding sites. Amadi et al 13 state that original biodiversity can be eroded by habitat degradation and alien species impact. Meanwhile, aquaculture heavily impacts the structure and diversity of local fish communities 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

et al. 2020

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Background: The capture fishery sectors in the river and reservoir play an important role in the Indonesian economy through increased income and diversification of livelihoods. The present study was conducted to ascertain fish diversity and their distribution pattern in the upstream and downstream areas of Koto Panjang Reservoir, Riau Province-Indonesia. Methods: Fish samples were collected for a period of 12 months using a variety of fish nets at four sites; Koto Mesjid (KM) and Batu Bersurat (BB), located in the upstream area of Koto Panjang Reservoir and Rantau Berangin (RB) and Kuok (KK), located in the downstream area of Koto Panjang Reservoir. Data obtained were analyzed using standard taxonomic keys based on morphometric characters. Results: A total of 44 species belonging 19 families and 33 genera were recorded in the study area. Alpha diversity indices showed that fish diversity in this area was quite high (Shannon’s index = 2.10 and Simpson-D = 0.21) and evenness was low (evenness H/S =0.19). The ﬁsh in KM and BB sites (upstream) were from eight and 11 families, respectively. In RB and KK sites (downstream), fish were from 16 and 15 families, respectively. In KM, BB, RB and KK sites, the dominant family was Cyprinidae, comprising 33.45%, 50.95%, 43.04% and 39.35% of all fish caught at each site, respectively. Exotic species, especially Nile tilapia, were 20.15%, 14.11%, 5.62%, and 5.34%, respectively. Some differences were also noted between the upstream and downstream reservoirs, with a slight increase in exotic species in the upstream reservoir over the study period (from 11.39% vs. 34.66%), corresponding to decrease of native species (from 88.61% vs. 65.34%). Conclusions: The diversity and distribution of fish fauna were varied in upstream and downstream areas of Koto Panjang Reservoir. The exotic species were found to be dominant in the upstream reservoir areas.

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“…The specific richness of Lake Togo is consistent with data from Eyi et al (2016) and Adou et al (2017) who recorded 39 and 40 species respectively in the Ono Lagoon and Lake Ayamé 2 in Côte d'Ivoire. Species richness was lower than that of the River Hlan in Bénin (43 species of fish divided into 35 genera and 22 families, see Montchowui et al 2007), to the Baoulé and Bagoé rivers in the Niger River basin in Mali (over 70 species, Sanogo et al 2012Sanogo et al , 2015 or to southern Nigeria's waterbodies (mean number of species per site was 44.6 ± 19.1; median = 49, range 18-79; Amadi et al 2017). Lederoun (2015) identified 91 fish species belonging to 67 genera and 42 families in the whole of the Mono River basin (including the river and lagoons) between Togo and Bénin.…”

Section: Discussionmentioning

confidence: 94%

Diversity patterns and community characteristics of the fish assemblage of a West African lagoon

et al. 2018

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Freshwater fishes of Lower Guinean forest streams: Aquaculture heavily impacts the structure and diversity of communities

Cited by 5 publications

References 33 publications

Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

Diversity and distribution of fish fauna of upstream and downstream areas at Koto Panjang Reservoir, Riau Province, Indonesia

Diversity patterns and community characteristics of the fish assemblage of a West African lagoon

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