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Critical Stage in Developing Walleye Eggs
Author(s) -
Latif Muhammad A.,
Bodaly R. A.,
Johnston Thomas A.,
Fudge Robert J. P.
Publication year - 1999
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(1999)061<0034:csidwe>2.0.co;2
Subject(s) - biology , stizostedion , embryo , incubation , gastrulation , egg incubation , incubation period , organogenesis , embryogenesis , zoology , fishery , fish <actinopterygii> , gene , biochemistry
Egg mortality in walleye Stizostedion vitreum during various developmental stages was monitored at an incubation temperature of 10°C. More than 80% of the mortality occurred during 50–100 h postfertilization or 21–42 temperature units (TU = number of days postfertilization × incubation temperature in o C), particularly during the transformation of germinal layers into various organs of the embryo (i.e., gastrulation–early organogenesis). Mortality declined once the body (head and trunk) of the embryo was formed. This period of high mortality might be considered as a critical stage of walleye egg development. Any environmental stress during this period might cause even higher egg mortality.