Sagala, E.P. 2015. THE BIODIVERSITY OF NURSERY GROUND IN SWAMP AREAS IMPORTANT TO SURVIVE THE BLACK FISHES IN THE WETLAND. BIOVALENTIA: Biological Research Journal. 1, 1 (Nov. 2015), 34–38. DOI:https://doi.org/10.24233/BIOV.1.1.2015.15.