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

研究了视锥蛋白基因在鲭亚目鱼类视网膜中的表达。南澳鲈和罗氏鲈属远洋鱼类，均具有单一的绿色（RH2）和蓝色（SWS2）视蛋白基因。而生活在上层的海螺，其RH2和SWS2基因均有复制。两种深海物种lepturus和genempylus serpens均含有RH2基因，但未分离到SWS2基因。Rod-opsin （RH1）基因在这两种深层物种中均有显性表达。

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.