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Effects of egg quality on normal fertilization and early development of the cod, Gadus morhua L
Author(s) -
Kjørsvik E.,
Lønning S.
Publication year - 1983
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.1095-8649.1983.tb02877.x
Subject(s) - biology , gadus , osmotic concentration , human fertilization , insemination , atlantic cod , zoology , offspring , fishery , anatomy , fish <actinopterygii> , botany , endocrinology , sperm , pregnancy , genetics
Normal cod eggs respond to insemination by a rapid cortical reaction followed by an increase in total osmolarity and a small increase in egg diameter. The chorion becomes harder, but this is a slower process reaching its maximum strength after c . 24 h. Bad eggs are characterized by a slower or incomplete cortical reaction, resulting in a slower rise in osmolarity and a softer chorion. Bad eggs rapidly lose their capacity for fertilization. In unfertilized eggs in sea water, no cortical reaction is observed. There is, however, a rise in total osmolarity and a hardening of the chorion.