Available Online: http://www.ejpau.media.pl/volume15/issue1/abs-02.html
COLOURATION OF RECIPROCAL HYBRIDS OF SALMON (SALMO SALAR L., 1758) AND SEA TROUT (SALMO TRUTTA M. TRUTTA L., 1758) AGED 0+ AND 1+ GROWN IN THE NATURAL CONDITIONS
Lucyna Kirczuk1, Józef Domagała2
1 Department of General Zoology, University of Szczecin, Poland
2 Department of General Zoology, University of Szczecin, Szczecin, Poland
The study was performed on the reciprocal hybrids of Salmo salar and Salmo trutta aged from 4 to 24 months, grown in natural conditions. As far as colouration is concerned, the ♀ trout x ♂ salmon hybrids aged 0+ and 1+ were found to resemble salmon of the same age (similar number of spots above and below the lateral line and on the opercular bones, and the spots below the lateral line reached the distance marked by the end of the dorsal fin). The salmon x ♂ trout hybrids resembled trout, but the ranges of variation of individual features were greater than in trout. The hybrids of the two types differed from the parent species in the greater ranges of variation of particular characters, irregular distribution of spots, brighter colours and irregular shapes of larval spots and other spots. Some hybrids representing the two types had untypical lighter colouration with larval spots only or with additional few little spots.
Key words: colouration; hybrids; Salmo salar x Salmo trutta; Salmo trutta x Salmo salar .
Department of General Zoology,
University of Szczecin, Poland
Felczaka 3c, 71-415 Szczecin, Poland
phone: +48 91 444 16 19
fax +48 91 444 16 23
Department of General Zoology, University of Szczecin, Szczecin, Poland
Z. Felczaka 3C
phone: +48 91 444 16 24
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