Abstract. Kustantinah, Hidayah N, Noviandi CT, Astuti A, Paradhipta DHV. 2022. Nutrients content of four tropical seaweed species from Kelapa Beach, Tuban, Indonesia and their potential as ruminant feed. Biodiversitas 23: 6191-6197. is one the countries with largest diversity seaweed, but studies on identifying nutrients numerous oceans feed have not been widely reported. This study was designe...