[Ecological characteristics of different Pseudosciaena crocea culture models]

A comparative study was conducted on the ecological characteristics of different Pseudosciaena crocea culture models including monoculture P. crocea (F) and polyculture P. crocea with seaweed Gracilaria lichevoides (FG), benthos Perinereis aibuhitensis (FP), and G. lichevoides plus P. aibuhitensis (FGP) in land-based enclosures, with the sediment and water environment condition, culture benefit, and nitrogen (N) and phosphorus (P) reclaim efficiency analyzed. G. lichevoides could effectively remove the N and P in the water body. The water N and P concentrations in FG and FGP were significantly lower than those in F and FP, and the P utilization efficiency reached 33.8% - 34.0% of the total P input. P. aibuhitensis improved sediment environment condition. The sediment N and P concentrations in FP and FGP were lower than those in F and FG, and had significant differences between surface sediment (1-2 cm) and subsurface sediment (2-4 cm). Comparing with those in F, the total N, total P, and inorganic P in FP and FGP reduced by 8.9% -9.2% , 6.1% -6.3% and 8.0% -8.1%, respectively. P. aibuhitensis had a higher efficiency in reclaiming sediment P (7.5% -7.8% of the total P input), being able to effectively mitigate the P accumulation in sediment. Among the test models, FGP had the best material utilization efficiency and optimal resource benefit.