Off-flavour in Nile tilapia (Oreochromis niloticus) cultured in an integrated pond-cage culture system
Off-flavour in Nile tilapia (Oreochromis niloticus) cultured in an integrated pond-cage culture system
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综合池塘网箱养殖系统中养殖的尼罗罗非鱼（Oreochromis niloticus）的异味
DOI：
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发表时间：
2013
影响因子：
0.7
通讯作者：
Nueva Ecija
中科院分区：
文献类型：
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作者：
Redel Gutierrez;N. Whangchai;U. Sompong;Wiwat Prarom;N. Iwami;T. Itayama;N. Nomura;N. Sugiura;Nueva Ecija
由于水质恶化和疾病导致河流网箱产量大幅波动，泰国农民正在转向池塘网箱养殖。池塘网箱养殖罗非鱼有其优点，但也存在异味问题。本研究比较了单独在池塘中养殖的尼罗罗非鱼（Oreochromis niloticus）、单独在池塘网箱中（T2）、在有网箱鲶鱼的池塘中（T3）以及在有鲶鱼的池塘网箱中（T4）的异味化合物：土臭素和2-甲基异冰片（MIB）的水平。平河中笼养罗非鱼的异味水平也进行了类似测定，以进行比较。通过 HS-SPME-GC/MS 对土臭素和 MIB 进行的分析表明，所有池塘处理中的鱼均发现有异味。收获时，池塘网箱中的尼罗罗非鱼与平河网箱中的罗非鱼相比，土臭素和 MIB 水平显着较高（P<0.05）。在尼罗罗非鱼和杂交鲶鱼的处理中，土臭素和 MIB 水平没有观察到显着差异。鱼类、池塘水和沉积物中 MIB 的含量普遍高于土臭素。 MIB 流行的部分原因可能是池塘中存在产生 MIB 的放线菌，从 T4 病例的罗非鱼胃中分离到的放线菌显示出这种放线菌的存在。铜绿微囊藻和已知的异味产生者鱼腥藻属。和颤藻属，在池塘中定居，
Thai farmers are shifting to cage farming in ponds due to drastic fluctuations in production in river cages resulting mainly from deteriorating water quality and diseases. Cage culture of tilapia in ponds has its merits but it is not immune to off-flavour problems. This study compares the levels of off-flavour compounds: geosmin and 2-methylisoborneol (MIB), in Nile tilapia (Oreochromis niloticus) cultured alone in ponds (T1), alone in pond cages (T2), in ponds with caged catfish (T3), and in pond cages with catfish in ponds (T4). Off-flavour levels of caged tilapia in the Ping River were similarly determined for comparison. Analysis of geosmin and MIB by HS-SPME-GC/MS revealed that fish in all pond treatments were found to be off-flavoured. At harvest, Nile tilapia in pond cages had significantly higher geosmin and MIB levels (P<0.05) compared to tilapia from the Ping River cages. No significant differences were observed in both geosmin and MIB levels among the treatments for Nile tilapia and hybrid catfish. The levels of MIB were generally higher than those of geosmin in fish, pond water and sediment. The prevalence of MIB could be partly due to the presence of MIB-producing actinomycetes in the ponds as revealed from their isolation in tilapia's stomach from T4 case. Microcystis aeruginosa and known off-flavour producers, Anabaena spp. and Oscillatoria spp., colonised the ponds,