“…The Origins and Biogenesis of the livers of Scardinius and most other freshwater fishes, however, contain in addition to retinol appreciable quantities of the 3-dehydro derivative (cf-EDISBURY, MOR'roN, and SIMPKINS, 1937;EDISBURY, MORTON, SIMPKINS, and LOVERN, 1938;LEDERER, ROSANOVA, GILLAM, and HEILBRON, 1937;WALD, 1939a;MORTON and CREED, 1939;CAMA, DALVI, MORTON, SALAH, STEINBERG, and STUBBS, 1952), which may account for nearly 100 % of the liver retinols in some cases (Fig_ 32)_ A little-publicised finding is the widespread occurrence of 3-dehydroretinol in marine fish-liver oils also, often amounting to between 4 and 20 % ofthe total "vitamins A" (COLLINS, '" u MORTON and CREED, 1939;COLLINS, LOVE, and MORTON, 1953;GROSS and BUDOWSKI, 1966), and hence the only dietary source would be other fishes. The Origins and Biogenesis of the livers of Scardinius and most other freshwater fishes, however, contain in addition to retinol appreciable quantities of the 3-dehydro derivative (cf-EDISBURY, MOR'roN, and SIMPKINS, 1937;EDISBURY, MORTON, SIMPKINS, and LOVERN, 1938;LEDERER, ROSANOVA, GILLAM, and HEILBRON, 1937;WALD, 1939a;MORTON and CREED, 1939;CAMA, DALVI, MORTON, SALAH, STEINBERG, and STUBBS, 1952), which may account for nearly 100 % of the liver retinols in some cases (Fig_ 32)_ A little-publicised finding is the widespread occurrence of 3-dehydroretinol in marine fish-liver oils also, often amounting to between 4 and 20 % ofthe total "vitamins A" (COLLINS, '" u MORTON and CREED, 1939;COLLINS, LOVE, and MORTON, 1953;GROSS and BUDOWSKI, 1966), and hence the only dietary source would be other fishes.…”