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Effects of fish size on spawning time in Norwegian spring‐spawning herring
Author(s) -
Slotte A.,
Johannessen A.,
Kjesbu O. S.
Publication year - 2000
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2000.tb02107.x
Subject(s) - biology , herring , clupea , gonad , fishery , fjord , norwegian , broodstock , zoology , spring (device) , stock (firearms) , fish <actinopterygii> , aquaculture , oceanography , anatomy , mechanical engineering , linguistics , philosophy , engineering , geology
During October‐January in a northern Norwegian fjord system and in February‐March at the main western Norway spawning grounds, an index I G of gonad weight of spring‐spawning herring Clupea harengus in percentage of expected gonad weight at full maturity for a given total length L T , tended to increase with L T in the range 27–31 cm as the proportion of recruit spawners decreased. Insignificant differences in I G were found between L T 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. I G also increased with somatic and total condition factor, which signifies that spawning time may be influenced by summer feeding conditions.