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The current study explores the possibility that multiple fish farms (FFs) containing sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) can be successfully integrated within a semi-enclosed bay in the Croatian Adriatic. The research focuses on determining principal environmental factors (EFs) that control the integration and attempts to estimate their individual and synergic ability to influence deposition and removal of organic matter (OM) and trace elements (TE) from the system. The complexity of the designated tasks demanded a comprehensive number of various datasets and samples to be used in the analysis. The ADCP data revealed strong wind induced currents forming within the research domain resulting in high system flushing efficiency (3.5—6 days). The sediment samples from all stations contained relatively inert minerals which contributed to overall low OM and TE concentrations and very limited variability found across the entire bathymetric range. The thermal advection effect recorded at two stations was attributed to specific seabed topography and the hydrodynamic response formed during Maestral wind episodes. The results indicate that a successful integra- tion of four FFs has taken place within the research site (semi enclosed bay), and that the key EFs responsible for its success are strong wind induced hydrodynamics, favorable seabed topography and sediment mineral composition. The synergy of the principal EFs that formed within the system was found to have an attenuating effect regarding FFs chemical influence (OM and TE) and an amplifying one regarding spatial footprint which extended to = 2000 m distance.
Analysis of the fatty acid composition as percentage of total fatty acids of wild juveniles of sea bass caught off the western coast of the Malaysian Peninsular showed that more than 38% of total fatty acids consisted of the two essential ones, 20:5w3 (eicosapentaenoic acid) and 22:6w3 (docosahexaenoic acid). Laboratory-reared larvae had lower contents of 20:5w3 and 22:6w3. In both wild and cultured juveniles, the 16:0 and 18:1 were high while the latter had higher 18:3w3 (linolenic acid) and 18:2w6 (linoleic acid). Juveniles suffering from whirling disease had very low concentrations of 20:5w3 (2.9%) and 22:6w3 (0.02%). Their proportion of 18:3w3 at 9.4% and 18:2w6 at 18.4% were high. .
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