Lateral muscle development of the Pacific bluefin tuna, Thunnus thynnus orientalis, from juvenile to young adult stage under culture condition
2001
Hattori, N. (Kinki Univ., Shirahama, Wakayama (Japan). Fisheries Lab.) | Miyashita, S. | Sawada, Y. | Kato, K. | Nasu, T. | Okada, T. | Murata, O. | Mumai, H.
The volume of lateral muscle, cross-sectional area of red and white fibers, and the number of fibers were examined for artificially hatched bluefin tuna, Thunnus thynnus orientalis, from juvenile to young adult stage within the size range of 19.5-163.0mm body length (BL). The red and white muscle volumes increased exponentially with BL. At a size larger than 80.0mm BL, both the volume increases were significantly accelerated. The proportion of red muscle volume in the total lateral muscle volume slightly increased with BL The cross-sectional area and the total number of red and white fibers at the point of maximum body height increased in the BL range examined. The small red fibers (< a 100 micro square m in size) of a cross-sectional area gradually disappeared with the growth of BL In contrast, there existed the white small fibers (200-300 micro square m in size) at all body sizes. Increases of both fiber numbers were approximately accelerated at sizes larger than 85mm BL. The size of 80-85mm BL, at which the phase change of muscle development occurred, corresponded to the transitional stage from juvenile to young adult.
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