IT is known that in Salmo salar Linn. there occurs regularly a very small percentage, possibly of the order of 0·1 per cent, of mature female fish in which discharge of ova may be delayed or does not take place. Such fish are found many months after the normal spawning time heavy with ripe ova. In certain parts of Scotland they are termed ‘baggots’ or ‘baggits’ by fishermen.
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Biological Reviews (1942)