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After 4 months outdoors (\u03a310,000 lux in albinos, \u03a3100,000 lux in normals), albinos had severely truncated or missing rod outer segments (ROS) and some missing rod ellipsoids, but normal numbers of photoreceptor nuclei and fully intact cones. Albino estimated ROS volume was only 7.1% of normal in July, but increased to 20% by the following February, mainly<jats:italic>via<\/jats:italic>an increase in numbers of ROS. However, in albinos moved indoors October 7 and exposed to 10\u201330 lux ambient daylight, both the number and length of ROS increased significantly, with estimated ROS volume reaching 95% of normal by 34 days. Albinos generally had more phagosomes (\u03a33 X normal) and more macrophages (\u03a32 X normal) in their outer retina. An optomotor reflex was used to define the effect of ROS volume on the ability to respond visually during dark adaptation. In July, albinos and normals from outdoor raceways (3 months) or indoor raceways (35 days) showed equal sensitivity after first being placed in darkness, but after 1 h in darkness, outdoor albinos with 6% of normal ROS volume were 2.0 log units less sensitive than indoor or outdoor normals, whereas indoor albinos with 53% of normal ROS volume were only 0.7 log units less sensitive. This verifies that most rod cell bodies of albino trout can persist without functional ROS in indirect sunlight, and can regrow functional outer segments in dim daylight. This finding is distinct from the extensive retinal light damage observed in albino rats exposed to more moderate cyclic light, in which entire rod cells degenerate early on.<\/jats:p>","DOI":"10.1017\/s0952523800012244","type":"journal-article","created":{"date-parts":[[2009,6,2]],"date-time":"2009-06-02T11:12:44Z","timestamp":1243941164000},"page":"589-600","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":27,"title":["Solar pruning of retinal rods in albino rainbow trout"],"prefix":"10.48130","volume":"14","author":[{"given":"Donald M.","family":"Allen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ted E.","family":"Hallows","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"27968","published-online":{"date-parts":[[2009,6,2]]},"reference":[{"key":"S0952523800012244_ref089","doi-asserted-by":"publisher","DOI":"10.1007\/BF00213738"},{"key":"S0952523800012244_ref081","doi-asserted-by":"publisher","DOI":"10.1007\/BF00305377"},{"key":"S0952523800012244_ref070","doi-asserted-by":"publisher","DOI":"10.1016\/0278-4327(93)90012-I"},{"key":"S0952523800012244_ref064","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4684-7257-8_6"},{"key":"S0952523800012244_ref062","doi-asserted-by":"publisher","DOI":"10.1016\/0042-6989(78)90098-6"},{"key":"S0952523800012244_ref087","doi-asserted-by":"crossref","first-page":"797","DOI":"10.1093\/genetics\/62.4.797","article-title":"Inheritance of albinism in the medaka, Oryzias latipes, with special reference to gene interaction","volume":"62","author":"Yamamoto","year":"1968","journal-title":"Genetics"},{"key":"S0952523800012244_ref054","first-page":"450","article-title":"Retinal damage by light in rats","volume":"5","author":"Noell","year":"1966","journal-title":"Investigative Ophthalmology and Visual Science"},{"key":"S0952523800012244_ref004","doi-asserted-by":"publisher","DOI":"10.1016\/S0014-4835(05)80036-3"},{"key":"S0952523800012244_ref002","doi-asserted-by":"publisher","DOI":"10.1007\/BF02144387"},{"key":"S0952523800012244_ref090","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.33.1.61"},{"key":"S0952523800012244_ref072","doi-asserted-by":"publisher","DOI":"10.1016\/1011-1344(92)85027-R"},{"key":"S0952523800012244_ref043","doi-asserted-by":"publisher","DOI":"10.1038\/293141a0"},{"key":"S0952523800012244_ref040","first-page":"47","article-title":"Is abnormal retinal development in albinism only a mammalian problem? 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