A study was conducted to determine the effects of the different graded levels of Gracillaria sp. in commercial feeds on the growth and survival of donkey's ear abalone, Haliotis asinina juvenile at Multi-Species Hatchery, College of Fisheries, Mindanao State University Tawi Tawi College of Technology and Oceanography Sanga-Sanga, Bongao, Tawi-Tawi for a duration of 45 days. The juveniles were fed with four (4) prepared diets containing graded levels of Gracillaria sp., namely: 0% as negative control (T1), 10% (T2), 20% (T3), 30% (T4) and live Gracilaria sp. as positive control (T5). Each treatment was replicated three (3) times using a Completely Randomized Design (CRD).
The results showed that the highest final weight (FW) of 47.37+13.4g, weight gain (WG) of 15.65+12.5g, final shell length (FSL) of 54.99+7.6 mm, shell length gain (SLG) of 8.84+2.4 mm and specific growth rate (SGR) of 0.37+0.8% were obtained from abalone juveniles in T2. The highest survival rate was also obtained from T2 of 23.33+3.3%. However, these results further revealed that treatments are not significantly different from each other (p>0.05).
The diet containing 10% of Gracilaria sp. could be preferable to be used as feed for abalone juveniles that could also promote better growth performance and survival rate.