Temporal synchrony among juvenile marine fishes and potential climate and environmental drivers in the Bay of Biscay

•We analysed the temporal dynamics of 12 juvenile marine fishes in the Bay of Biscay.•Time-series of annual fish abundance were derived from beam trawl survey data.•Dynamic factor analysis detected synchronous changes in abundance among species.•Interspecific synchrony was explained by climate and environmental factors.•Potential drivers were sea bottom temperature and the East Atlantic Pattern.