Abstract
Here, to evaluate ontogenic changes in visual sensitivity in juvenile longtooth grouper Epinephelus bruneus, we investigated opsin gene sequences and expression in larvae and juveniles. The longtooth grouper has 10 opsin genes: Rh1, five Rh2 genes (Rh2A1-1, Rh2A1-2, Rh2A2, g6738, and g6740), SWS1, two SWS2 genes (SWS2A1 and SWS2A2), and LWS. To date, five or six Rh2 opsin genes have been reported in perciform fishes. Differential opsin gene expression was examined by RT-PCR; the results suggested that switching from SWS1 to SWS2 occurs during early development, and that there is an absence of LWS expression between 14 and 40 days post-hatch. These ontogenetic changes in opsin gene expression may correspond to different requirements at different life stages.
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