Enhancing Water Quality in Intensive Asian Seabass (Lates calcarifer) Aquaculture Using Green Mussels (Perna viridis): A Biomass‒Normalized Apparent Reduction
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Abstract
Integrated multi‒trophic aquaculture (IMTA) is a promising strategy to mitigate water quality deterioration in intensive marine aquaculture, although continuous water renewal may obscure the role of extractive species. This study evaluated green mussel (Perna viridis) integration with Asian seabass (Lates calcarifer) under simulated marine IMTA conditions. A 60-day experiment with four mussel biomass treatments was conducted at constant seabass density, with routine water exchange (50% every three days). Key water quality parameters, including dissolved oxygen (DO), temperature, power of hydrogen (pH), salinity, total ammonia nitrogen (TAN), nitrite‒nitrogen (NO2-‒N), nitrate‒nitrogen (NO3⁻–N), alkalinity (ALK), total suspended solids (TSS), and turbidity, were monitored throughout the experiment. Asian seabass growth performance, survival, and biomass production were also assessed. Mussel‒integrated treatments showed significantly lower concentrations of ALK, TAN, TSS, and turbidity, along with higher NO3⁻–N, compared with the control (p<0.05), whereas DO, temperature, pH, NO2-‒N, and salinity did not differ significantly among treatments. Despite identical water‒exchange regimes, the presence of mussels contributed to improved water quality stability. Fish growth, survival, and biomass production were enhanced in mussel‒integrated systems, particularly at intermediate to high mussel biomass. These results demonstrate that green mussels can enhance water quality and production performance in intensive Asian seabass culture beyond the effects of routine water exchange alone, supporting the application of biomass‒based IMTA as a practical approach for sustainable marine aquaculture.
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