Length-weight relationship and condition factor of endemic fish Bilih (<i>Mystacoleucus padangensis</i> Blkr.) in Lake Singkarak, West Sumatra, Indonesia

Bilih fish (Mystacoleucus padangensis) is an endemic species in Lake Singkarak, West Sumatra, Indonesia. It has high economic value, rich in nutrition and as an export commodity. Bilih dominated the catch in Lake Singkarak. The excessive fishing causes fish population decline. There has been an indication of stock decrease and overfishing exploitation status. Fisheries management needs to carry out to maintain the sustainability of bilih fish. This study was conducted to determine the vulnerability status of bilih fish as an information for bilih fish management. Data analysis was carried out using Productivity and Susceptibility Analysis (PSA). PSA is a semiquantitative risk assessment method used to assess the impact of fisheries on fish stocks. Based on 11 productivity and 12 susceptibility attributes, this study was conducted. The results showed that the vulnerability index was in the high category (v=2.1) and the productivity parameter value (p=1.3) lower than the susceptibility value (s=2.3), indicating bilih status is vulnerable to over fishing and need to be maintained.

Section: Productivity Parametersmentioning

confidence: 99%

“…The growth pattern of bilih fish has changed from positive allometric growth [14] to negative allometric growth [16]. The asymptotic length of bilih fish (L∞) = 11.6 cm with a growth rate (K) = 0.5 per year.…”

Section: Productivity Parametersmentioning

confidence: 99%

Vulnerability of endemic bilih fish Mystacoleucus padangensis Bleeker, 1852 in Lake Singkarak, West Sumatra, Indonesia

Triharyuni¹,

Rahmadi²,

Puspasari³

et al. 2022

“…Singkarak Lake in West Sumatra Province has an area of 11,220 ha, with a maximum depth of 270 m and is geographically located at a position of 100°26'15"-100°35'5" E and 0°31'46"-0°42'20" LS. The waters of Lake Singkarak are classified as rather fertile (mesotrophic) with fish production potential ranging from 4,463-21,279 tons/year [7]. Furthermore, of the 17 types of fish that inhabit this lake, the types of fish that are widely caught are Bilih fish (Mystacoleuseus padangensis), Asang (Osteochilus brachinopterus), Turiek (Cyclocheilichtys de Zwani), and Sasau (Hampala spp.…”

Section: Introductionmentioning

confidence: 99%

“…Bilih fish has a slightly larger size than anchovies, oval and flattened in shape with a length of 6-12 cm, that is an endemic fish where only found in Lake Singkarak and also the largest fish population [7]. Bilih fish is quite expensive with a price range of IDR 60-70 thousand for 1 kg.…”

Section: Introductionmentioning

confidence: 99%

Organophosphate pesticide residues in surface water and bilih fish (Mystacoleucus padangensis Blkr.) in Lake Singkarak, West Sumatra

Syawal¹,

Ibrahim²,

Yustiawati³

et al. 2023

Organophosphate pesticide is a pesticide derivate that is used widely by farmers because it has a high killing power against insects and easily disappears from plants. Organophosphate pesticide residues can accumulate in the environment and also cause acute and chronic poisoning in humans. Singkarak Lake in West Sumatra Province is surrounded by many agricultural and farming areas. One of fisheries resources that can be affected by activities at those areas is Bilih fish (Mystacoleucus padangensis). The study aims to determine the levels of organophosphate pesticide residues in Singkarak Lake’s water and Bilih fish. Seven organophosphate pesticide compounds: Diazinon, Fenitrothion, Methidathion, Malathion, Chlorpyrifos, Parathion, and Profenofos were analyzed. In June 2021, surface water and Bilih fish samples were collected from 10 sampling locations in Singkarak Lake. The organophosphate pesticide in the samples was determined using gas chromatography. The results showed that residues were detected in water samples of four locations (Ombilin, Tikalak, Sumani, and Paninggahan), but not in the other six locations (Batu Taba, Sumpur, Guguak Malalo, Saniang Baka, Muaro Pingai, and Tanjung Mutuih) as well as below 1 ppb. Methidathion, Malathion, Chlorpyrifos, and Parathion were detected in lake water at range 2 to 8 ppb. Except for the Bilih fish sample from Ombilin, the majority of the samples contained organophosphate residues. Diazinon, Fenitrothion, Methidathion, Chlorpyrifos, Parathion, and Profenofos were the organophosphate derivate found in the fish samples. Malathion compound was not found. The organophosphate residue concentration in Bilih fish ranged from 2 to 70 ppb.

“…They are prioritized to be rehabilitated and managed sustainably. Lake Singkarak has been heavily polluted by plastic waste from land derived and transported through the riverine system [20]. The hydrology regime of Lake Singkarak has been controlled by a sluice in the only lake outlet due to the installation of a hydropower dam.…”

Section: Introductionmentioning

confidence: 99%

Microplastic pollution in the surface water of Lake Singkarak, Indonesia

Henny¹,

Rohaningsih²,

Suryono³

et al. 2022

Microplastic pollution is already at an “alarming” level in Indonesia’s marine and freshwater ecosystems. However, to the best of our knowledge, no study has reported the microplastic occurrence in the lake ecosystem in Indonesia. Lake Singkarak, a big tectonic lake, has been considered one of the priority lakes to be restored. The lake receives a high influx of plastic waste from rivers and catchment runoff. Controlling the outflow through the hydropower dam and the sluice in the main lake outlet may prevent the microplastic’s outflux. The study’s objective was to determine the microplastic first occurrence and abundance in the lake’s surface water. Water samples were collected from three sites in the lake inlet area, one in the intake area of the hydropower dam and one in the outlet area, by performing four parallel trawls in each site using a modified plankton net. The most abundant microplastics in the lake’s surface water were 9 particles/m3 in the lake inlet area, which received a high plastic waste input from the river. The lowest abundance was 2 particles/m3 in the main lake outlet area. Foams and fragments, white and clear in color, size of 300 μm, were the dominant types of microplastics observed. Our preliminary study suggests that the lake could act as a sink of microplastics. Therefore, ceasing the input sources of plastic waste from the river should be prioritized to prevent further microplastic pollution of Lake Singkarak.