Mifa Bersaudara Company (PT. Mifa Bersaudara) is one of the mining company operated in Aceh Barat District, Indonesia. Several small rivers and peat swamps are present in the concession area of the company. These waters have potency on fisheries; However, presently, there was no data on the ichthyofauna in the concession area of this company. Hence, the objective of the present study was to inventory the ichthyofauna in the small rivers and swamps around the concession area of PT. Mifa Bersaudara as a baseline data for monitoring program in the future. The sampling was done from 28 to 29 January 2019 at 12 sampling sites. The fish sample was caught using the casting net and fish trap from 06.00 AM to 5.00 PM. A total of 659 individual of fishes were sampled during the survey, it belongs to 7 orders, 11 families, 17 genera and 23 species. Cyprinidae and Rasbora argyrotaenia are the predominant family and species, respectively. One species of alien fish Oreochromis niloticus was recorded during the study.

Mikania micrantha is a weed that is commonly found on agricultural land. Environmentally friendly weed control can be done using bioherbicides because the materials used come from nature. Terminalia catappa contains secondary metabolites so that its bioactive compounds can be used as weed control. This study aims to determine the total secondary metabolite compounds of Terminalia catappa leaves and their effect on Mikania micrantha seed germination. This study used a factorial Completely Randomized Design (CRD). The first factor is various types of solvents aquadest, ethanol and methanol. The second factor was the concentration of the extract application 30%, 50%, 70% and repeated 3 times so that there were 27 experimental units. Data were analyzed using analysis of variance if it had a significant effect, further tests were carried out using 5% BNJ. The results showed that the Terminalia catappa leaf extract with distilled aquadest of 70% was able to prevent the seeds from germinating while the methanol and ethanol solvent extracts were able to inhibit the germination of Mikania micrantha seeds at an application concentration of 30%.