Abstract
During October‐January in a northern Norwegian fjord system and in February‐March at the main western Norway spawning grounds, an index IG of gonad weight of spring‐spawning herring Clupea harengus in percentage of expected gonad weight at full maturity for a given total length LT, tended to increase with LT in the range 27–31 cm as the proportion of recruit spawners decreased. Insignificant differences in IG were found between LT groups in the range 32–37 cm (repeat spawners). This is contrary to that suggested in other studies and signifies that generally the stock spawns in only two waves, repeat spawners first and the recruit spawners second. IG also increased with somatic and total condition factor, which signifies that spawning time may be influenced by summer feeding conditions.
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