| Spawning of herring (Clupea harengus membras L.) in the Archipelago Sea (1993) | |||||||||
Abstract | |||||||||
| ICES journal of marine science, ISSN 1054-3139, vol. 50, 233 - 246. Spawning of herring (Clupea harengus membras) was investigated in the Archipelago Sea, south-west Finland, in 1987-1989 using SCUBA diving, trap-net sampling, and catch statistics. Herring spawned repeatedly on the same beds. Spawning was rather continuous from April to July when the whole spawning area was considered and took place in temperatures between 4 and 18*C. Spawning shoals consisted of fish of different size and age. Egg densities varied between locations, years, and spawnings. Egg size and mortality were dependent on the spawning time. In the early spawnings, eggs were larger than in the late ones. Egg mortality was | |||||||||
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