Plastic waste can be found everywhere, including in the Koto Panjang Dam. As the plastic waste degraded, the microplastic materials may be distributed in the water and it may be accidentally swallowed by omnivorous fishes such as  Puntius schawanafeldii.  To understand the presence of the microplastic materials in the fish stomach, a research has been conducted in December 2020 - February 2021. The number of P.  schawanafeldii captured was 30 using fish net in 3-5 inch mesh size. The fish was dissected and the stomach was removed. Then the stomach content was added with 10% KOH andwas incubated for 2 weeks to delute the organic materials. Then was investigated under a binocular microscope to find out the microplastic materials. Results shown the type of microplastic present in the stomach of P. schawanafeldiiwas namely film, fibre, and fragment. The most common type of microplastic found was film, followed by fragments and fibre. The abundance of microplastic in the stomach of P.  schwanafeldii was around 2 – 15,8 particles/fish

Tofu liquid waste contains high levels of organic matter, especially protein and amino acids. These organic compounds can be proteins, carbohydrates and fats. Most of the bacteria are able to use oil or fat as a source of carbon and energy, bacteria that have this ability are often known as lipolytic bacteria. This study aims to obtain biosurfactant producing bacteria from tofu wastewater. This research was conducted from July - September 2020. The method used in this research is survey method and emulsification method. The media used for bacterial isolation were Tryptic Soy Broth (TSB) and Tryptic Soy Agar (TSA). 6 of the isolates are able to produce biosurfactants. Morphological and biochemical characteristics indicate six bacterial genera, namely Genus Agrobacterium, Proteus, Proteus, Citrobacter, Enterobacter, and Serratia. The bacteria obtained are bacteria that have the potential to degrade oil in a polluted environment.

In the Koto Panjang Reservoir the microplastic may originated from the degraded plastic waste as well as degraded plastic net from the fish culturing cages. The microplastic may be accidentally ingulfed as fish swallowing their food. To understand the present of microplastic present in the stomach of wild common carps living around the fish net cage, a study was conducted on in December 2020- February 2021. The fish were captured using fish net (3-5 inc mesh size), 3 times, once/ 2 weeks. The fish stomach was removed and the presence of the microplastic was identified. The stomach content of the fish was mixed with 10% KOH (minimum 3 x of stomach content volume) and was incubated for2 weeks to dilute the organic materials. Then the presence of microplastic was observed using a binocular microscope. Types and abundance of the microplastic was noted. Results shown that the types of microplastic present were   films, fibers and fragments. The highest type of microplastic found in the stomach of the fish was films  (2.3 particles/ fish), followed by fibers (0.6 particles/fish) and fragments  (1.1 particles/ fish).

This study was conducted from January-April 2017 located in Sail River, Pekanbaru City, Riau Province. The aim of this study was to investigate morphometric and meristic characters of Asian knifefish (Notopterus notopterus) besides as the most accurate initial identification of certain species. Fish samples were collected using sero (traditional setnet) to be further observed for their morphometric and meristic characters using ruler of 50 cm. Morphometric analysis applied to the Asian knifefish resulted in 23 characteristics. The highest value was found in the total length (TL) of female fish which reached 135-270 mm, while the lowest was in the characteristic of snout length (SNL) in male fish of 1,3-1,8 mm. A total of 8 meristic characteristics were observed, included: Dorsal fin rays (D), Pectoral fin rays (P), Ventral fin rays (V), Anal fin rays (A), Scales before dorsal fins, Circumference scales, Scales at caudal peduncle, and Scales along lateral line. According to its morphological characters, Asian knifefish has a flat body with sideways-elongated oval shaped and a humpback appearance. The shape of head near the back is relatively straight and scaly. The mouth of this species has protractile structure (able to protrude) with a terminal position and no tentacles. Asian knifefish has a large size of mouth opening as they are carnivorous fish. Adult fish has an evenly brown color, slightly concave dorsal shape, dark bands all over the body; and white-silver head color with enormous small gray spots. The fish body is covered with cycloid scales.