brisling bristling calcium can canned clupeidae edible European-sprats fatty-acids fish food golden health healthy heart-healthy herring-family herring-like marine-fish nonperishable nutrient-rich nutrients nutritious oil oily-fish omega-3 packed polyunsaturated portable potential self-contained-food skipper small smoked sprats sprattus-sprattus tightly-packed tin tinned tins vitamins can-opener breakable brown brown-eggs calcification calcium-carbonate chicken-eggs colored coloring colors coloured colouring colours cook cooking egg eggs eggshells external farm-fresh fragile fragility fresh fresh-eggs haemoglobin hemoglobin hens-eggs life mottled mottling outer-covering outside oval oviduct ovoid pigmentation pigmented-shells pigmenting protoporphyrin speckled surface surfaces surfacing texture textured textures variety various accessible crammed European-sprat open opened pilchards sardines silvery skin sprat tight Dirt earth environment igneous metamorphic Mineral nature object rock science Sed Soil