EFFECTS OF SALINITY ON THE DEVELOPMENT OF FRESH-WATER AND BRACKISH-WATER RUFFE GYMNOCEPHALUS-CERNUUS (L) EMBRYOS

Authors
VETEMAA M SAAT T
Citation
M. Vetemaa et T. Saat, EFFECTS OF SALINITY ON THE DEVELOPMENT OF FRESH-WATER AND BRACKISH-WATER RUFFE GYMNOCEPHALUS-CERNUUS (L) EMBRYOS, Annales zoologici Fennici, 33(3-4), 1996, pp. 687-691
Citations number
17
Categorie Soggetti
Zoology
Journal title
Annales zoologici Fennici → ACNP
ISSN journal
0003455X
Volume
33
Issue
3-4
Year of publication
1996
Pages
687 - 691
Database
ISI
SICI code
0003-455X(1996)33:3-4<687:EOSOTD>2.0.ZU;2-#
Abstract
Eggs of ruffe inhabiting a fresh-water (FW) lake and a brackish-water (BW) Baltic bay were inseminated and reared in sea water of different salinity. Normal prelarvae hatched at salinities up to 9 ppt in the BW ruffe and 6 ppt in the FW ruffe. The duration of incubation until hat ching in the BW ruffe remained constant at 0-8 ppt but increased in th e FW ruffe at salinity > 2 ppt. The maximum length of prelarvae in the BW ruffe was observed at higher salinity than in the FW ruffe. These differences indicate an adaptive increase in embryonic salinity tolera nce of ruffe inhabiting brackish water.