The database identifies all technical data related to sampling methodologies (fishing techniques, conditions and dates), as well as characteristics of the samples collected (taxa, fish abundance and weight, and individual length and morphometric dimensions). The data can potentially be used to: describe nekton assemblages characterizing dyked marshes and natural intertidal (natural marshes and mudflats) and subtidal areas in a macrotidal estuary; compare nekton assemblages among anthropized, restored and natural habitats within the same estuary; study the temporal dynamics of nekton assemblages in tidally restored marshes; study the size distribution of several species (e.g. Liza ramada, Dicentrarchus labrax, Pomatoschistus microps, Palaemonetes varians, Palaemon longirostris) within diked and other intertidal habitats of the Gironde estuary; study length-weight relationships of multiple fish and macrocrustacean species.