Abstract Heavy metals are generally a problem even at the world level as a threat to humans. Phytoplankton Cychlotella sp. are the main producer in the food chain in aquatic ecosystems. The purpose of this study was to determine the effect of the toxicity of heavy metals Pb and Cd on the growth of microalgae Cychlotella sp. and to compare the more toxic heavy metals expressed in 3 parameters, …
Abstract Lubuk Siam is one of the Oxbow lake in Kampar district. It is the habitat of Baung fish (Hemibagrus Nemurus) which has the high economic value. The purpose of this study was to determine the concentration of heavy metals (Cd and Cr) in the organs (gills, muscles, and bones) of Baung fish in this lake. The sample of fish from Lubuk Siam lake were collected and destructed according to t…
Abstract In the fish culture using multilayered floating net cage, the fish that was reared in the outer layer cage may feed on the pellets spilled from the inner layer cage and thus the outer layer caged fish receive nutritious feed that support their live, including their reproduction process. To understand the reproductive biology of Barbonymus schwanenfeldii reared in the outer layer net c…
Abstract The coastal area in Dumai Barat District has experienced many changes in the function of coastal land and mangroves so that various human activities provide input of organic and inorganic materials that will affect air quality and phytoplankton. This study aims to determine the fertility of the waters in the coastal area of west Dumai District, Dumai City, Riau Province. This research…
Abstract The presence of gastropod is related to the seagrass condition. A study purposes to understand the relationship between seagrass and gastropod densities in the Teluk Bakau Beach Bintan, Bintan Regency Riau Islands has been conducted in April-May 2022. There was a survey method with three stations, namely the area close to human inhabitant (St1), ecotourism area (St2), and natural area…
ABSTRACT Heavy metals in water can be included in hazardous and toxic materials when found in high concentrations. Mercury (Hg) and Chromium (Cr) are dangerous heavy metals if it enters a body of water, it will affect aquatic organisms. This study aims to determine the effect of heavy metals Hg and Cr on the growth of Dunaliella sp. through the value of IC50 96 hours, LOEC and NOEC, and chloro…
Abstract Water quality in the upstream and the downstream of the Kampar River is diferent due to pollution. However, Macrobrachium rosenbergii can be found in those areas. The condition of the water may affect the morphological characteristics of the prawn. To understand the morphological differences of the prawn, a study has been conducted in February - April 2022. Samplings were conducted th…
ABSTRACT Growth of Dunaliella sp is affected by environmental condition and nutrient present in the media. To understand the effect of liquid fertilizer made from fermented Azolla sp and light intensity on the growth of Dunaliella sp, a study has been conducted on April 2022. There was a CRD, with two treatments of liquid fertilizer dosages, namely P1 (0.62 ml/L), P2 (1.86 ml/L), P3 (3.10 ml/L…
ABSTRACT Heavy metals are chemicals that can pollute waters and are toxic to microalgae, such as mercury (Hg) and zinc (Zn). Heavy metal Zn is an essential heavy metal, but it is toxic if the metal concretation is high in water. The study aimed to find out the toxicity of Hg and Zn as well as compare the toxicity of Hg and Zn against the abundance of Cyclotella sp. in 3 parameters namely, IC50…
ABSTRACT Giant freshwater prawn Macrobrachium rosenbergii is economically important prawn species that inhabits the Rokan and Siak Rivers in Riau. The waters in both rivers, however, are under pressure due to pollutant. To understand the water quality and to understand the morphological characteristics of the prawns from both rivers, a study has been conducted in April-May 2022. The prawns wer…
ABSTRACT Selodang River is a distributary channel originated from the Mandau River. Along the river of the Selodang River, there are palm and rubber plant plantations activities. During the rainy season the run off water may carry organic materials originated from the plantations and it is potencial to increase the organic matter of the water and thus affect the limnological condition of the w…
Abstract Rivers play a very important role in meeting daily needs, such as for tourism activities, PDAM, transportation route infrastructure as well as for drinking water, bathing, washing places, and fish cultivation needs. One of the rivers in Riau Province which also plays an important role in people's lives is the Win River. The purpose of this study was to determine the condition of the w…
ABSTRACT Puntius schawanefeldii is one of common fish in the Koto Panjang Dam. This fish commonly present around the floating cage culture area. Small P. schawanefeldii sometimes enter the culture cages and become trapped in the cages as they grew up. Farmers used to remove the trapped fish and put them in the cage around the cage culture area. The net caged P. schawanefeldii were not given an…
ABSTRACT Thynnichthys thynnoides is a freshwater fish found in Danau Kebun Nopi. This fish has economic value and is often caught by fishermen. A study aims to determine the growth pattern of Thynnichthys thynnoides. The study used a survey method. Sampling was carried out 4 times from March-April 2022. The results showed that 107 fish captured consist of 39 females and 68 males. Thynnicht…
Abstract The mangrove forest area in Rawa Mekar Jaya Village as a whole has an area of 25 hectares. The condition of this mangrove forest used to be damaged, but in 2012 the mangrove forest in Rawa Mekar Jaya Village was designated as a conservation area, the mangrove ecosystem of Rawa Mekar Jaya Village is also used by the local community for capture fisheries activities, especially catching …
Abstract Dunaliella sp is one of primary producer that play an important role in food chain. Pb and Cd are non-essential heavy metals that are toxic to aquatic organisms. This study aimed to determine the toxicity of Pb and Cd on Dunaliella sp based on IC50, LOEC, and NOEC values and chlorophyll-a content after Pb and Cd in Dunaliella sp. The research was conducted in March-May 2022 at the Was…
Abstract Bivalve is commonly inhabit the coastal waters of the Sungai Pisang Bay. A research aims to understand the structure of bivalve community in this area was conducted in February – April 2021. The bivalve samples were collected manually at 3 stations. In each station, there were one belt transect that consisting 10 sampling plots (1m x 1m). Sampling was conducted twice, once/ mont…
Abstract Chlorella sp. is one of the aquatic plants that play an important role in the environment as primary producer. One of the advantages of Chlorella sp. Some species are able to survive in various types of waters including peat, brackish swamps, rivers and lakes. Microalgae contain oil (lipids), carbohydrates, proteins with very wide variations in composition which can be used as a renew…
Abstract Zooplankton has an important role in the waters as a link between primary producers and lower trophic levels. This study aims to determine the structure of the zooplankton community in the coastal waters of the Pisang River, Bungus Teluk Kabung District, Padang City. This research was conducted in February 2021 using a survey method. The sample analysis of zooplankton community struct…
Abstract Sail River is a sub-watershed of the Siak River in Pekanbaru City with various community domestic activities that cause the waters to be polluted by waste. One of the organisms that is tolerant of poor water quality is microalgae. The aims of this research to determine the potential microalgae in the Sail River. This research was conducted in September-December 2021 using a survey met…