Kambey, Cicilia and Sondak, Calvyn Fredrik Aldus and Chung, Ik Kyo
(2016)
The estimation of seaweed production and nitrogen flux in the Integrated Multi Trophic
Aquaculture (IMTA) system using STELLA model.
In: Annual Meeting of Japanese Society for Aquaculture Science in 2016, November 2016, Japan.
Abstract
Recently seaweed cultivation has been considered as a measure to mitigate the coastal eutrophication
and therefore, seaweeds are incorporated in the Integrated Multi trophic Aquaculture (IMTA) system. To
estimate the ecophysiologycal mitigation potential and biomass production of two commercially important red
algal species, Kappaphycu.r; alvarezii and Graci/aria sp., a STELLA model was implemented with respect to
their nitrogen pools and dynamics in IMTA systems. Growth rates, productivity, stocking densities and
removal efficiencies were calculated under various conditions. The external forcing factors such as current
velocity, temperature and irradiance were also considered for 45-days culture period. Combination ofN content
from 0.05 g N m-3 to 5 g N m-3 and stocking density of 50 g FW m-2 to 1000 g FW m-2 were considered.
Graci/aria sp. showed have higher growth rate of above 5 g N m-3
• The N removal rate reached peak up to
65 % under the conditions oflow DIN concentrations up to 1 g N m-3 and stocking densities of 500 to 1000 g
FW m-2
• We could apply the result of STELLA simulation studies in selecting location for culture ground,
setting stocking densities, adjusting the fish cage effluents and other factors which could affect seaweed growth
and production.
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