Changes in myoglobin content and proximate compositions of the dorsal ordinary muscles of full-cycle cultured Pacific bluefin tuna Thunnus orientalis (Temminck et Schlegel) with body size
2007
Tsukamasa, Yasuyuki | Nakamura, Yoshi-Nori | Andō, Masashi | Seoka, Manabu | Kawasaki, Ken-Ichi
We investigated the changes in myoglobin (Mb) content and proximate compositions of the cephalad parts of the dorsal ordinary muscles (Ce-DOM) of full-cycle cultured (FC) Pacific bluefin tuna [body length: 42.6-115.4 cm, body weight (BW): 1.7-38.4 kg, killed from July 2004 to October 2005]. The Mb content of Ce-DOM increased (P<0.01) until a BW of 7.0 kg was reached. However, the Mb content of Ce-DOM had a wide variety above a BW of 7.0 kg. On the other hand, the moisture, protein and ash contents of Ce-DOM of FC tuna decreased (P<0.05 and 0.01) with an increase in BW. However, the lipid content of Ce-DOM increased gradually above about a BW of 20.0 kg. Furthermore, the Mb content in protein of the Ce-DOM of FC tuna increased with an increase in BW. These results indicated that the increase in Mb content of Ce-DOM of FC tuna was not related to changes in proximate composition between a BW of 1.7 and 38.4 kg.
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