Adaptation of visual pigment classes to habitat depths and its relation on fish diversity

研究了视锥细胞视蛋白基因在棘鱼亚目鱼类视网膜中的表达。澳大利亚尖吻对虾(Scomber Australasicus)和罗氏对虾(Auxis Rochei)均含有单一的绿色(RH2)和蓝色(SWS2)视蛋白基因。平叶青冈生活在上层，复制了RH2和SWS2两个基因。在两个深海物种中，纤毛鱼和蛇类都含有RH2基因，而SWS2基因在这两个物种中均未分离到。Rod-opsin(RH1)基因在这两个较深的物种中以表达类为主。

Expressions of cone opsin genes in the retinas of fish species belonging suborder Scombroidei were investigated. Each of Scomber australasicus and Auxis rochei, which are pelagic species, had single green (RH2) and blue (SWS2) opsin gene. Sphyraena pinguis living more upper layer than those species, duplicated both genes of RH2 and SWS2. The two abyssal species of Trichiurus lepturus and Gempylus serpens had RH2 gene, however, SWS2 gene was not isolated from either of them. Rod-opsin (RH1) gene was dominantly expressed class in these two deeper species.