Journal of Aquaculture Research & Development

Abstract

Effect of Use Fresh Macro Algae (Seaweed) Ulva fasciata and Enteromorpha flaxusa With or Without Artificial Feed on Growth Performance and Feed Utilization of Rabbitfish (Siganus rivulatus) fry

Mohamed FA Abdel-Aziz and Mohammed A Ragab

This study a low-cost aquaculture diet with fresh seaweed was tested with the herbivorous rabbitfish (Siganus rivulatus) fry. Two fresh seaweed was genera, Ulva and Enteromorpha (belong to family Ulvaceae) were used to replace the artificial feed by 0, 50 and 100 percent regardless the protein percentage. Initial average weight of fry was 0.18 g. This trial consisted of sixth treatments, the first treatment (T1) fish fed on artificial feed only, the (T2) fish fed of half feeding rate on artificial feed and other fresh Ulva , the (T3) fish fed of half feeding rate on artificial feed and other fresh Enteromorph, the (T4) fish fed on fresh Ulva only, the (T5) fish fed on fresh Enteromorpha only and the (T6) fish fed of half feeding rate on fresh Ulva and other fresh Enteromorph. Feeding rat was 7% of biomass and this trial continued for 70 days. There were significant differences between the treatments in all the growth performance parameters. The T3 was the highest in final weight (W₂), total weight gain (TG), average daily gain (ADG), relative growth rate (RGR) and specific growth rate (SGR), followed by both the T2 and T1. And the best feed conversion ratio (FCR) was achieved with T3, T1 and T2 followed by T6 and T5 but the T4 had the worst FCR.