The study was conducted to determine the effects of different amounts of rotifer (Brachionus sp.) on the growth and survival rate of early juvenile bloodworm, Marphysa sp. in treated seawater at Multi-Species Hatchery, College of Fisheries of the Mindanao State University Tawi-Tawi College of Technology and Oceanography, Sanga-Sanga, Bongao, Tawi-Tawi. Bloodworm larvae were fed with three (3) different amounts of rotifer, namely, 5ml (T1), 10ml (T2) and 15ml (T3) and the feeding trial lasted for 45 days. The results of the growth trial showed that final setigers (FS) and setigers gain (SG) of bloodworm juvenile fed with rotifer in 10ml (T2) seawater obtained higher than those fed with rotifer in 5ml (T1) and 15ml (T3). Survival rate showed that T1 with 8.89 ± 2.2% and T2 with 7.78 ± 1.1% were significantly higher than T3 with 1.11 ± 1.1% but T1 and T2 has no significant difference (p < 0.05). Feeding of 30 juvenile with rotifer in 10ml seawater could be a preferred amount for early juvenile that could promote better growth and survival.