186
J. A. C. NICOL
ooastal marine fish, e.g. spiny dogfish (Sqwlus acanthias), sea robin
(Prionotus carolinus), black sea base (Centropristes striatus), and surface
ooeanic species, 0.g. the skipper (Scomberesox saurus). Purple-coloured
pigments, known as porphyropsins, are the principal scotopic pigments
of freshwater teleosts, e.g. tench (Tincu vulguris) and bream (AbramL
bramu). Yellow or gold-coloured pigments known aa chrysopsins,
Wavelength (mp)
k’ict. 0. A1worptio11 n p w t r e (nrwo I ) ot’nxtriuh of rotinno of two deep-see Ash (A mas.
nirowii I A o w 0w1i (wrvo). (Curves 3 nnd 3 baeed on Dnrtnall’a nomogrnm and
clilTnroncir Hpotro irftnr exposuro to yellow light, mspeotively ; me original paper of
Hiiilz, 1Y68b, for dOtnilR.)
visual golds or deep-sea rhodopsins, occur in the rods of deep-water
oceanio fishes from the twilight (mesopelagic) zone, e.g. bathypelagk
sharks (Centrophorus squamom), chimaeroids (Hydrolugus ufinis) and
teleosts (Gonostoma elongatum, etc.). Rhodopsins contain retinene,,
derived from vitamin A,, and exhibit maximal absorption around
500 mp. Chrysopsins also contain retinine,, and have maximal absorption in the blue, around 485 mp (Figs. 5 and 6). Porphyropsins contain
J. A. C. NICOL
ooastal marine fish, e.g. spiny dogfish (Sqwlus acanthias), sea robin
(Prionotus carolinus), black sea base (Centropristes striatus), and surface
ooeanic species, 0.g. the skipper (Scomberesox saurus). Purple-coloured
pigments, known as porphyropsins, are the principal scotopic pigments
of freshwater teleosts, e.g. tench (Tincu vulguris) and bream (AbramL
bramu). Yellow or gold-coloured pigments known aa chrysopsins,
Wavelength (mp)
k’ict. 0. A1worptio11 n p w t r e (nrwo I ) ot’nxtriuh of rotinno of two deep-see Ash (A mas.
nirowii I A o w 0w1i (wrvo). (Curves 3 nnd 3 baeed on Dnrtnall’a nomogrnm and
clilTnroncir Hpotro irftnr exposuro to yellow light, mspeotively ; me original paper of
Hiiilz, 1Y68b, for dOtnilR.)
visual golds or deep-sea rhodopsins, occur in the rods of deep-water
oceanio fishes from the twilight (mesopelagic) zone, e.g. bathypelagk
sharks (Centrophorus squamom), chimaeroids (Hydrolugus ufinis) and
teleosts (Gonostoma elongatum, etc.). Rhodopsins contain retinene,,
derived from vitamin A,, and exhibit maximal absorption around
500 mp. Chrysopsins also contain retinine,, and have maximal absorption in the blue, around 485 mp (Figs. 5 and 6). Porphyropsins contain