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Osmotic changes during the development of eggs and larvae of the lumpsucker, Cydopterus lumpus L.
Author(s) -
Kjörsvik E.,
Davenport J.,
Lönning S.
Publication year - 1984
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.1095-8649.1984.tb04802.x
Subject(s) - biology , yolk , hatching , demersal zone , human fertilization , salinity , larva , fishery , zoology , pelagic zone , ecology , anatomy
The demersal eggs of Cyclopterus appear to osmoregulate like the pelagic eggs of cod and plaice. Unfertilized eggs in ovarian fluid exhibited ovoplasm osmolarities similar to those of adult blood and ovarian fluid (356–359 mosmol kg −1 ). Yolk osmolarities remained virtually constant from fertilization and during development (356–366 mosmol), with a slight decrease near hatching (to 332 mosmol). Yolk and body fluids of larvae (338 mosmol) had osmoconcentrations similar to egg yolk values near hatching. Yolk osmoconcentration of unfertilized eggs remained unchanged during the first 12 h in sea water, with a slow increase thereafter. Fertilized eggs of bad quality cultures exhibited higher yolk osmoconcentrations than eggs of good quality. Cyclopterus eggs were found to develop normally and survive in 20–34%o salinity, larvae seemed to have the same salinity range.