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

Abstract

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.

Fish species biodiversity of Dadin-Kowa reservoir: Current status

“…The species evenness (J) of this study is documented as 0.84, this value is in line with 0.83 recorded from Gubi Dam 60 . This is relatively greater than the recorded values from Lagos Coastal waters 61 , Riau Province, Indonesia 62 and Lakhandaha reservoir 63 . Reference to Kreb's guidelines; the present outcome of this study is said to have a stable community since species evenness is greater than 0.75, although less than 1 (one) 59 .…”

“…The fluctuations of diversity, uniformity and dominance of fish communities portrays the influence of physical, chemical and food factors 59 . Fish species had been observed to be influenced by cumulative impacts of aqua-cultural activities such as water quality degradation, intensified intra and inter specific competitions, invasive species and habitat defragmentation 62 but damming or river abstraction 64 alongside water recession and sample size 57 strengthened the justification for the fluctuations of fish species richness including Dadin-Kowa reservoir. However, it was noted that latitude (especially low) increase both size and species diversity of fish communities, this is further supported by lake depth which was observed to contribute to the variations of diversity, probably because deep lakes tend to have larger space with habitat heterogeneity to accommodate wide range of fish species, this followed the Habitat Diversity Hypothesis which states "that diversity is controlled by the availability of different habitats" 65 .…”

Kelimpahan Dan Keanekaragaman Jenis Ikan di Perairan Ndalir Kabupaten Merauke, Papua

“…Faktor yang menyebabkan adanya kelimpahan spesies seperti preferensi habitat sehingga spesies tertentu dapat ditemukan di satu lokasi namun tidak dijumpai di lokasi lain (Simanjuntak, 2012). Selain itu juga kelimpahan spesies dipengaruhi oleh substrat, salinitas, kemampuan bertahan terhadap arus dan ombak, faktor ketersediaan sumber makanan, serta faktor perlindungan diri dari keadaan disekitar (Aryani et al, 2020;Ravichandran et al, 2001;Syahrial et al, 2020).…”

Analysis of Fatty Acids and Amino Acids of Three Local Freshwater Bagridae Fish Species in the Kampar Kanan River, Indonesia, for Food Security

“…Hemibagrus nemurus, locally known as "baung," Hemibagrus wyckii, known as "geso," and Mystus nigriceps, known as "ingir-ingir," are three species of catfish found in the Kampar Kanan River, Indonesia [5,6]. Due to their high market value, these species have been identified as significant economic resources for rural communities [7].…”