The photoreceptor cells and the angle of minimum resolution(AMR)for four species of coral-reef teleosts,Sebastes hubbsi,Sebastes nigricans,Hexagrammos otakii and Hexagrammos agrammus have been studied by means of common histological methods.The main results obtained are as follows:(1)Cone photoreceptors in the retinas of H.otakii and H.agrammus are arranged in a mosaic:four double cones are arranged in a square around a single central cone.The double cones of S.hubbsi and S.nigricans form highly organized rows and the single cones are distributed around four double cones occasionally.Compared with S.hubbsi and S.nigricans,the arrangement of cones for H.otakii and H.agrammus is more complex,and the ratio of single cones to double cones is greater in the retinas of H.otakii and H.agrammus,which may indicate that H.otakii and H.agrammus have a better color vision.(2)The ratio of rod cells to cones of S.hubbsi and S.nigricans is greater than 7：1,but for H.otakii and H.agrammus the ratio is less than 3：1.It is speculated that S.hubbsi and S.nigricans are nocturnal,while H.otakii and H.agrammus are diurnal.(3)The areas of greatest cone density for S.hubbsi,S.nigricans,H.otakii and H.agrammus are found in the ventral-temporal region,ventral region,ventral-temporal region and dorsal-temporal region,respectively,which is adapted to their ecology and feeding behavior.(4)For the four experimental species of fish,the AMR with S.hubbsi,S.nigricans,H.otakii and H.agrammus decrease in sequence.The preliminary analysis suggests that even in the same habitat,the visual characteristics for different species of fish vary a lot,which may provide some beneficial reference for the development of high selective fishing gear.