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Abstract

Nine wild-captured cobia (Rachycentron canadum) and the compatible number and size of cultured cobia from two cagecultured sites, namely Penghu (PH) and Pingtung (PT) Counties, were sampled for chemical analyses. The condition factor of wild cobia was significantly lower than those of cultured fish. The wild cobia had higher moisture content than that of the cultured one, while fat contents in both dorsal and ventral muscles of the former were significantly lower than those of the latter. There were no significant differences between cultured and wild cobia in protein and ash contents. The total free amino acids (FAAs) contents in cultured cobia from two different localities were higher than those of wild fish. Taurine was the most prominent FAA in wild cobia, while glycine was more prominent in cultured fish than in the wild one. Lysine contents were significantly the highest in both dorsal and ventral muscles in PH-cultured cobia. The contents of glutamic acid, glutamine, alanine, ornithine and proline in cultured cobia were higher than those in wild cobia. There was no significant difference between wild and cultured cobia in anserine content, while carnosine was detected only in wild cobia. Inosine monophosphate was the major component in ATP-related compounds in both wild and cultured cobia, but no significant difference in its levels between the wild and cultured groups was found. The contents of ammonia was higher in PH-cultured cobia than those in both PT-cultured and wild cobia, yet no significant difference in urea content of both D and V muscles among the three groups.

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