Development of visual cells in the Pacific bluefin tuna <Emphasis Type="Italic">Thunnus orientalis</Emphasis> |
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Authors: | R Matsuura Y Sawada Y Ishibashi |
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Institution: | (1) Department of Fisheries, School of Agriculture, Kinki University, Nakamachi, Nara 631-8505, Japan;(2) Present address: Criminal Investigation Laboratory of Nara Prefectural Police Headquarters, 585 Imaichi-cho, Nara 630-8444, Japan;(3) Fisheries Laboratory, Kinki University, Ohshima, Kushimoto, Wakayama 649-3633, Japan; |
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Abstract: | The development of rod and cone photoreceptor cells was investigated in the retinas of Pacific bluefin tuna larvae and juveniles,
using RET-P1 monoclonal antibody labeling to identify photoreceptors. At 60 h after hatching, which was about when feeding
began, opsin (presumably green opsin (Rh2)) was expressed in the outer segments of cone cells. At 15 days after hatching (dah),
although many labeled cone cells were observed in the dorsal retina, the same type of cone cells had partially appeared in
the ventral retina. The presence of rod cell bodies was confirmed by the expression of Rh1 opsin at 15 dah. At 21 dah, the
presence of outer segments of rod cells was confirmed by the expression of Rh1 opsin and by morphology. The observations suggest
that the cone cells were substantially operable upon the development of their outer segment at around the beginning of the
post-larval stage, and the rod cells began to function at around 15 to 21 dah, before and during metamorphosis. |
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