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ObjectiveFish is the most important animal-source food (ASF) in Bangladesh, produced from capture fisheries (non-farmed) and aquaculture (farmed) sub-sectors. Large differences in micronutrient content of fish species from these sub-sectors exist. The importance of fish in diets of vulnerable groups compared with other ASF; contribution from non-farmed and farmed species to nutrient intakes; and differences in fish consumption among age, gender, wealth groups and geographic regions were analysed, using quantitative intra-household fish consumption data, focusing on the first 1000 d of life.DesignTwo-stage stratified sample.SettingNationally representative of rural Bangladesh.SubjectsHouseholds (n 5503) and individuals (n 24 198).ResultsFish consumption in poor households was almost half that in wealthiest households; and lower in females than males in all groups, except the wealthiest, and for those …