Spawning of sea trout, Salmo trutta L., in brackish waters—lost effort or successful strategy?

In order to investigate factors of importance for successful reproduction of sea trout, Salmo trutta L., in brackish water, fertilization and incubation of eggs were conducted at different salinities at about 4°C. In addition, duration of spermatozoan motility at different salinities was quantified...

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Bibliographic Details
Published in:Fisheries research 1998-05, Vol.35 (3), p.229-236
Main Authors: Landergren, Peter, Vallin, Lars
Format: Article
Language:English
Subjects:
Agnatha. Pisces
AGUA SALOBRE
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Brackish
BRACKISH WATER
EAU SAUMATRE
Egg development
FECONDATION
FECUNDACION
FERTILIZATION
FISHERY RESOURCES
Fundamental and applied biological sciences. Psychology
OVIPOSICION
OVIPOSITION
PONTE
RECURSOS PESQUEROS
REPRODUCCION
REPRODUCTION
RESSOURCE HALIEUTIQUE
SALINIDAD
SALINITE
SALINITY
SALMO TRUTTA
Salmonidae
Sperm motility
SUECIA
SUEDE
SWEDEN
Vertebrata
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Summary:In order to investigate factors of importance for successful reproduction of sea trout, Salmo trutta L., in brackish water, fertilization and incubation of eggs were conducted at different salinities at about 4°C. In addition, duration of spermatozoan motility at different salinities was quantified by observations on sperm from 11 males. The results indicate that fertilization is possible at salinities characteristic of the waters around the Baltic island of Gotland, Sweden (6.7 psu) but the ensuing egg development is inhibited at salinities exceeding 4.0 and no hatching was observed in ambient Baltic Sea water (BSw). Sea trout have been observed to spawn along the Gotland shore but the outcome of this effort, in terms of recruitment to the sea trout population, must be regarded as non-existent.
ISSN:0165-7836
1872-6763
DOI:10.1016/S0165-7836(98)00073-3