ANALISIS KEPADATAN DAN KEANEKARAGAMAN PLANKTON DALAM KAITAN DI TINGKAT KESUBURAN PERAIRAN MANGROVE GUNUNG ANYAR TAMBAK SURABAYA, JAWA TIMUR = ANALYSIS OF PLANKTON DENSITY AND DIVERSITY CORRELATED WITH THE FERTILITY RATE OF MANGROVE FOREST IN GUNUNG ANYAR, TAMBAK SURABAYA, EAST JAVA - NISAK NIKMATUL JANAH, 141311133019 (2018)