Bulletin of the SFI 2 (156) 2002 -Morphomechanic changes during the embryogenesis of spring herring (Clupea harengus L.) in the Puck Bay

Morphomechanic changes during the embryogenesis of spring herring (Clupea harengus L.) in the Puck Bay
Bulletin of the Sea Fisheries Institute 2 (156) 2002, pp. 45-56

Krzysztof Formicki, Agata Korzelecka-Orkisz, MAŁGORZATa BONISŁAWSKA¹,
Adam Ta�ski, Wawrzyniec Wawrzyniak¹ and Aleksander Winnicki
Agricultural Academy of Szczecin, K. Królewicza 3-4, 71-550 Szczecin, Poland
¹University of Szczecin, W�ska 13, 71-415 Szczecin, Poland

Key words: Clupea harengus membras L., reproduction, eggs, embryonic development, larvae, Baltic Sea, Puck Bay

Abstract.
The study on enbryogenesis in the Baltic herring (Clupea harengus membras L.) shows the embryonic development to take, on average, 188 h (the duration measured in thermal units is to 2450 h�). Herring eggs are very small; when activated they absorb a relatively large volume of water, about twice the cell volume when laid. The hydrated eggs are highly diverse in size. The volume of eggs produced by a female may range from 0.97 to 1.95 mm³. The biological importance of the differences observed is discussed.