Page 48 - Aquauclature Research and Studies (01)

AQUAUCLATURE
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Research and Studies 1 (1): 15-01, 2026 page of 193

Fig. 1: Showing (A): Harvested Biomass, (B) The delipidated form of dried algal Biomass
of N. Oceanica.
Phase 2:
Experimental fish diets were prepared using residual fat-free algal bio-
mass as a substitute for soybean meal as a primary dietary component for
post-larval red tilapia.
After oil extraction, the residual biomass was thoroughly washed with
dechlorinated tap water to remove any residual chemicals, then dried as
shown in Figure 1(b). It was then ground and added to the fish feed mixture
as shown in Table (2) for the application experiment on red tilapia larvae. The
initial larval weight was (0.32±0.1), while the average initial length was (1.9
cm±0.1).
The stocking denisty was 15 larvae per aquarium 20 L with experiment
duration for 30 days. At the end of the experiment ,the larval growth param-
eters and the biochemical compositions of the fish body were determined.
Table 2: Composition (%) of the experimental diets containing different inclusion levels of
lipid-free algal biomass as substitution for Soybean
Ingredient % Control 25% (1) 50% (2) 75% (3) 100%(4
Fish meal (FM) 23 23 23 23 23
Soy beam meal 23 17.25 11.50 5.75 ---