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In the present paper the three redfish species, Sebastes marinus, S. mentella , and S. viviparus , are compared by use of electrophoretic studies of haemoglobins and 17 enzymes in white muscle, liver, and eye tissue. Some enzymes are also studied in heart tissue. The aims of the investigation are to study the validity, relationships, and geographical distribution of the species and to reveal characteristics to be used for species identification of 0- and 1- group fish which cannot be identified by morphological traits. In some areas adult specimens, especially s. marinus and S. mentella , may also be extremely difficult to identify. Generally the species are very similar in most enzyme patterns. S. viviparus may be identified by malate dehydrogenase (MDH) in all four tissues, isocitrate dehydrogenase (IDH) from the eye, and malic enzyme (ME) from the liver. S. mentella can be separated from the others by haemoglobin patterns. In liver IDH both S. viviparus and S. marinus are polymorphic with clearly different frequency distributions, while S. mentella is monomorphic. In muscle ME S. mentella is polymorphic while S. marinus and S. viviparus are monomorphic. Variations in some other enzymes, probably polymorphisms, could also be seen, but either at very low frequencies or with electrophoretograms too weak for clear-cut typing of the specimens.
Nedreaas et al. (Sun,) studied this question.