GROWTH AND PROTEIN CONTENT OF Ulva prolifera MAINTAINED AT DIFFERENT FLOW RATES IN INTEGRATED AQUACULTURE SYSTEM

Abstract

Efforts to reduce the impact of waste improvement on degradation of water quality can be transferred by utilization of inorganic waste as a source of seaweed nutrition. This study aimed to determine the growth and protein content of Ulva prolifera maintained at different flow rates in integrated aquaculture system. 9 Yellowtail stocked with 5.095 g with an average weight of 566.11±81.51 g were kept in 540 L tank for 24 days, by water flowing at the rate of 10 L min-1. Water from the fish tank was distributed into the sediment tank and go to 6 Ulva tanks with the flow rate of 0.5, 1.0 and 1.5 L min-1. Test parameters measured were growth performance of Yellowtail, biomass of Ulva prolifera, protein content of Ulva prolifera, and total ammonia nitrogen. The measurement results showed that the biomass of fish increased to 5.408 g, then biomass of Ulva increased to 42 g, 156 g and 155 g for flow rate of 0.5 L, 1 L and 1.5 L min-1, respectively. The protein content of Ulva for all the treatments was the same (P> 0.05). A total of ammonia in the tank outlet of Ulva (0.0202 - 0.1137 mg N L-1) were smaller than those were in the inlet (0.0286 - 0.1394 mg N L-1).

Effective and Low-Maintenance IMTA System as Effluent Treatment Unit for Promoting Sustainability in Coastal Aquaculture

“…generally showed high biofiltering efficiencies. In accordance, previous studies have shown that macroalgae from genus Ulva can efficiently remediate aquaculture effluents [5,32,39,46,49,55,56]. Nutrient removal rates within the same order as those reported in literature were attained in this work and, generally, NRE showed a tendency to increase in autumn for nitrogen compounds (LU2 and AQU2) and in spring for phosphorous compounds (AQUA1).…”

“…In IMTA systems, Msuya et al and Al-Hafedh et al reported similar SGR values [40,44,45], although lower biomass yields were achieved in one's study. On the other hand, higher SGR values (>18% day −1 ) have been reported in previous works [5,39,46] which used continuous effluent flow.…”

“…Moreover, continuous effluent flow improves biomass production of Ulva spp. [41], water flow velocity and aeration being key factors for inorganic nutrient acquisition and algae growth [46,52].…”

Current knowledge and future perspectives of the use of seaweeds for livestock production and meat quality: a systematic review

“…The cultivation of macroalgae may also be done in a variety of systems from raceways to settling ponds. Water flow and aeration may be necessary to promote the renewal of the boundary layer between algae and water surfaces, in order to favour the diffusion of the nutrient into the algal biomass (Diamahesa, Masumoto, Jusadi, & Setiawati, 2017). Relying on nutrient concentration and water flow, which can range from one to sixteen water exchanges (per day), it is possible to enhance nutrient uptake and growth (Neori et al, 2003).…”

“…Relying on nutrient concentration and water flow, which can range from one to sixteen water exchanges (per day), it is possible to enhance nutrient uptake and growth (Neori et al, 2003). If the water flow is low, nutrients will become limiting, biomass production will decrease, but the nutrient uptake efficiency will increase (Diamahesa et al, 2017). This may be an alternative, whenever sample space for extensive systems is available.…”