PLANKTON ABUNDANCE AS BIOINDICATOR OF THE TROPHIC STATUS WATER IN KOMERING RIVER, SERDANG MENANG VILLAGE, PULAU SIRAH PADANG SUB-DISTRICT, OGAN KOMERING ILIR REGENCY. Sainmatika. 2020;17(2):157-164. doi:10.31851/sainmatika.v17i2.4356