AEI prepress abstract  -  DOI: https://doi.org/10.3354/aei00250

Comparing trace element concentrations in muscle tissue of marbled eel Anguilla marmorata reared in three different aquaculture systems

Li Li*, Wenjing Ren, Chengyue Liu, Shuanglin Dong, Yunhao Zhu

*Email: 86lily@163.com

ABSTRACT: There is a growing trend towards culturing fish in intensive recirculating aquaculture systems, which have a reduced need for water exchange compared to many other systems. However, it is unknown whether these intensive aquaculture operations would facilitate bioaccumulation of trace metals in fish tissue. The present study therefore aimed at evaluating and comparing metal accumulation in the flesh of marbled eel Anguilla marmorata reared in 3 different systems: recirculating aquaculture system (RAS), concrete ponds (CP), and biofloc technology system (BFT). Fish were fed the same feed and reared in water of the same source. Twenty trace elements (Al, As, Ba, Be, Co, Cr, Cu, Fe, Li, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Ti, V, and Zn) in the fish flesh were analyzed by inductively coupled plasma-optical emission spectrometry (ICP-OES). Fish cultured in RAS only had 1 element (Al) accumulated compared with fish in CP. The high Al concentration in eels was probably related to the high Al in their feed. The As, Ba, Cr, Fe, Mn, Ni, Se, Sn, Sr, Ti and Zn levels in fish reared in BFT were significantly higher than those of fish reared in CP and RAS. Our results suggest that regular monitoring of trace element concentrations in BFT and RAS should be implemented in the future, because the observed levels of As and Pb exceeded the legislation limits.