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Marine Biology

, Volume 111, Issue 1, pp 29–32 | Cite as

Egg mortality and hatching rate of Baltic cod (Gadus morhua) in different salinities

  • A. Nissling
  • L. Westin
Article

Abstract

Egg mortality of Baltic cod (Gadus morhua L.), collected off northern Gotland, Sweden, in 1990, was studied in four different salinities — 10 and 15 ppt (salinity of the principal spawning areas of Baltic cod) and 5 and 7 ppt (salinity above the halocline) — in laboratory experiments. Mortality was high during the first 4 d of development, but after gastrulation mortality was low in all salinities tested, except for 5 ppt, in which mortality increased slightly before hatching. Mortality during hatching varied considerably with salinity. No hatching occurred in 5 ppt salinity, and only a few larvae survived in 7 ppt salinity; in contrast, mortality during hatching was comparatively low in salinities of 10 and 15 ppt.

Keywords

Laboratory Experiment Gadus Morhua 
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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • A. Nissling
    • 1
  • L. Westin
    • 1
  1. 1.Institute of Systems Ecology, Section GotlandUniversity of StockholmStockholmSweden

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