Analysis of Microplastic Abundance in Manggaba’i Fish (Glossogobius giuris) in Lake Limboto

2026-09-16T19:38:35+07:00

Microplastics are aquatic environmental pollutants that can accumulate in aquatic organisms and enter the food chain. Lake Limboto is an aquatic ecosystem utilised by the local community and serves as a habitat for various fish species, including the Manggaba'i fish (*Glossogobius giuris*). This study aimed to analyse microplastics in Manggaba'i fish from Lake Limboto, categorised by length-based size groups. The study sample consisted of 20 fish divided into two size groups—10–12 cm and 12.5–14 cm—with 10 fish in each group. Sample preparation involved processing the fish digestive tracts with 30% H₂O₂ and 0.05 M FeSO₄ solutions; the samples were incubated for 24 hours, heated in a water bath at 75°C for 30 minutes, filtered using vacuum filtration, and examined under a microscope. Microplastic abundance was determined based on the number of particles found in each fish size group. The results showed microplastics in Manggaba'i fish, with an abundance of 0.2 particles/individual in the 10–12 cm size group and 0.3 particles/individual in the 12.5–14 cm size group.

Analysis of Microplastic Abundance in Sediments of Lake Limboto

2026-09-16T19:53:42+07:00

Microplastics are a form of environmental pollution that can accumulate in aquatic sediments and impact ecosystem quality. Lake Limboto is a significant aquatic ecosystem in Gorontalo Province currently facing various environmental issues, including pollution and waste accumulation. This study aimed to analyse microplastic abundance in sediments at several locations in Lake Limboto and to determine differences in abundance based on environmental characteristics and human activities near the sampling sites. We sampled four locations: an area far from settlements, Pentadio Barat Village, an area near settlements, and an area near a waste disposal site. Sediment samples were collected approximately 5 m from the lake edge at a depth of 50 cm using a shovel. The samples were oven-dried at 110°C for 24 hours, pulverised, and then sieved using a 250-mesh sieve. A 15 g portion of sediment from each location was mixed with 50 mL of saturated NaCl solution, left to stand for 24 hours, and then filtered through Whatman No. 42 filter paper using vacuum filtration. Microplastics trapped on the filter paper were subsequently examined under a microscope. The results showed the highest microplastic abundance near the waste disposal site (333.3 particles/kg), while the lowest abundance was in Pentadio Barat Village (66.66 particles/kg). Locations near settlements had an abundance of 266.6 particles/kg, whereas locations far from settlements had 200 particles/kg.

KUANTUM: Jurnal Pembelajaran dan Sains Fisika

Analysis of Microplastic Abundance in Manggaba’i Fish (Glossogobius giuris) in Lake Limboto

Analysis of Microplastic Abundance in Sediments of Lake Limboto