Almost all of its amino acids in suggested tuning positions are identical in the halibut ultraviolet opsin (expect one amino acid).
Their conclusions with regard to halibut stock structure in the area supported those from previous investigations using other methods of stock discrimination.
The ver tical migratory nature of the halibut life style makes this species interesting in relation to adaptation of the visual system to changes in light environment.
Halibut appears to be almost equally promising, but there are problems in maintaining the very large breeding fish required.
Their natural sandy colour is denied them, although in all other respects they are as other halibut.
The marine fish upon which work is being undertaken are plaice, sole, halibut and turbot.
We brought in catches of between 1,200 to 1,500 tons of halibut at a time—the finest quality halibut obtainable.
Halibuts are slightly difficult due to their large size, and they also take a longer time to mature.
