The changes in proximate compositions and glycogen contents in the dorsal ordinary muscles of the full-cycle cultured Pacific bluefin tuna Thunnus orientalis occurring with growth |
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| Authors: | Yoshi -Nori Nakamura Masashi Ando Manabu Seoka Ken -Ichi Kawasaki Yasuyuki Tsukamasa |
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| Institution: | Laboratory of Aquatic Food Science, Department of Fisheries, Faculty of Agriculture, Kinki University, Nara 631-8505, and;Fisheries Laboratory, Kinki University, Wakayama 649-5145, Japan |
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| Abstract: | ABSTRACT: Using full-cycle cultured (FC) Pacific bluefin tuna (body length BL], 42.6–66.4 cm; body weight BW], 1.66–7.40 kg, n = 15), the changes in chemical compositions and histological structure of the cephalal parts of the dorsal ordinary muscles (DOM) occurring with growth were investigated. A positive correlation ( r = 0.9644, P < 0.05) was observed between BL and BW with growth. The protein, lipid and ash contents of DOM and condition factor did not change with growth. However, the glycogen content of DOM increased ( P < 0.05) from approximately 55 cm (BL) in this study. Using optical microscopic photographs, the various shapes of muscle fibers were observed and it was noted that the muscle fiber diameter increased ( P < 0.05) with growth. Using transmission electron microscopic observation, many glycogen granules were observed in muscle fibers (especially, side of connective tissue) of DOM throughout the growth stage in this study. These results indicate that the glycogen content of DOM of FC Pacific bluefin tuna increases before the lipid with growth. |
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| Keywords: | full-cycle culture glycogen histology ordinary muscle Pacific bluefin tuna proximate composition |
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