Abstract
This study investigated the use of a combined formula of artificial feed and fresh marine algae Gracilaria sp in a submerged cage culture system and its effect on Haliotis squamata relative growth and survival rates. The experiment was performed in Lae-Lae Island, Makassar from May to October 2016. The sample Abalone juvenile larvae were 1.5 cm in size and stocked at a density of 30 pcs/cage. The cage size was 30 cm x 15 cm x 7 cm and equipped with a 2-inch Paralone pipe. This experiment employed a completely random design (CRD) with 3 treatments and 3 replicates. The applied treatment included the combination of artificial feed and fresh marine algae Gracilaria sp. Each treatment included: A. 25% artificial feed + 75% fresh marine algae, B. 50% artificial feed + 50% fresh marine algae, C. 75% artificial feed + 25% fresh marine algae, and was given at the proportion of 20% of the abalone's weight. The results of the study indicated that the use of a combined artificial feed with fresh marine algae (Gracilaria sp.) had no significant effect on relative growth and survival rates of Haliotis squamata. Although feed treatment did not significantly affect the relative growth and survival rate, descriptively, treatment A contributed to the most optimal relative growth and the survival rate compared to treatments B and C.
Highlights
The abalone Haliotis squamata is a species of sea snail or gastropod with a significant economic value (Ardi et al, 2020; Yun et al, 2020)
Analysis of Variance indicated that the combination of artificial feed and fresh marine algae Gracilaria sp had no significant effect on the relative growth of Abalone Juvenile larvae (P>0.05)>
The results of analysis of variance (ANOVA) indicated that the combination of artificial feed and marine algae Gracilaria sp did not affect the survival rate of Abalone juvenile larvae significantly (P>0.05)
Summary
The abalone Haliotis squamata is a species of sea snail or gastropod with a significant economic value (Ardi et al, 2020; Yun et al, 2020) These abalones are in great demand in countries such as Japan, the US, Europe, Columbia, and Canada (Cook, 2014; ABARES, 2017). To improve abalone production, breeding can be performed in submersible cages (Hadijah, 2017; Hadijah and Zainuddin et al 2015; Li and Ong, 2017) Another challenge for marine abalone culture is the lack of information about good feed quality for abalone growth and survival. The use of marine algae as natural feed in tropical abalone farming is considered to be inefficient due to the high feed ratio and resource. This research focused on the implementation of artificial feed combined with fresh marine algae in marine abalone farming as an alternative effort to reduce artificial diet use
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