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year. This study was conducted to determine the relationship between growth and age of first reproduction in herring stocks around Ireland. Measurements of otolith size at the onset of the first annulus (O1) were used to compare growth during the first year of life between 1-, 2-, and 3-group spawning herring collected from spawning grounds in the Celtic Sea in fish popula-growth during lity in the rate nd subsequent Van der Veer with two and mmercial and (Clupea hare-of substantial concerns as to ure of fishing the population tuations in th