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The Antarctic fish Trematomus newnesi (Boulenger, 1902) occurs from benthic to pelagic habitats, in seasonally and daily varied photic conditions that induce retinomotor movements. Fish were experimentally kept under constant darkness or light, and 12Light/12Dark for seven days. The retinomotor movement of the pigment epithelium was established through the pigment index, while that of the cones was calculated as the length of the myoid. The retinomotor movement of the pigment epithelium in T.newnesi,revealed that the adaptation to constant light occurred in the one hour of exposure, remaining constant for the next seven days. However, the adaptation to constant darkness, was slower. The difference between the mean values of the pigment indices in the time intervals of sampling was significant in the first hours of the experiment, and only after six hours they were not significant any more. The myoid of cones became elongated in darkness and contracted in light. In the experiments where T.newnesiwas exposed initially to 12 hours light followed by 12 hours darkness 12 was evidenced that the speed and intensity of the retinomotor movements was higher when darkness changed into light, than when light changed into darkness. O peixe antártico Trematoms newnesi (Boulenger, 1902) vive em habitats benticos à pelágicos, em condições fóticas que variam sazonalmente e diariamente, induzindo os movimentos retinomotores. Peixes foram mantidos experimentalmente, durante sete dias, sob luz ou escuro constante, e 12 horas luz/12 horas escuro. O movimento retinomotor do epitélio pigmentar foi estabelecido através do índice de pigmento enquanto que o dos cones foi calculado através do comprimento do mióide. O movimento retinomotor do epitélio pigmentar de T.newnesirevelou que a adaptação à luz constante ocorreu na primeira hora de exposição, permanecendo constante para os próximos sete dias. No entanto, a adaptação para o escuro constante foi mais lenta. A diferença entre a média dos valores dos índices de pigmento nos intervalos de tempo foi significativa nas primeiras quatro horas de exposição ao escuro e somente seis horas após não houve mais diferença significativa entre os tempos. O mióide dos cones alonga-se no escuro e contrai-se no claro. Nos experimentos onde T.newnesi foi submetido a 12 horas luz seguido por 12 horas escuro foi evidenciado que a velocidade e a intensidade dos movimentos retinomotores foi maior quando o animal passa do escuro para a luz do que quando passa da luz para o escuro

Retinomotor movements in the Antarctic fish Trematomus newnesi Boulenger submitted to different environmental light conditions