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Since 1995, a stratified random spring bottom trawl survey in the NAFO Regulatory Area of Div. 3NO was conducted by Spain. In 2001, the trawl vessel was replaced; so, the time series indices were transformed. The transformed entire series of mean catches, biomass and length distribution for redfish (Sebastes marinus, Sebastes mentella and Sebastes fasciatus collectively reported) are presented for the period 1995-2000, and the no-transformed data for the years 2002-2009. In 2001, there are data from the two vessels. The summed biomass based on conversion of the length frequencies are presented and compared to the estimates from the method used to convert the CPUE. The indices of this species were variable over the time, with a sharp increase in year 2009. There are no recent good recent recruitments. Material and methods Survey design and gear used The survey on NAFO Regulatory Area of Div. 3NO was initiated by Spain in 1995. Until 2001, the survey was carried out in spring (May), on board the Spanish vessel C/V Playa de Menduiña using bottom trawl net type Pedreira. Since that year, the R/V Vizconde de Eza replaced the C/V Playa de Menduíña as the research vessel for the survey, using bottom trawl net type Campelen. In order to maintain the data series obtained since 1995