Jonsson and Hindar, 1982



Citation


Jonsson, B. and Hindar, K. (1982) Reproductive strategy of dwarf and normal Arctic char (salvelinus alpinus) from Vangsvanet Lake, western Norway. Can. J. Fish. Aquat. Sci., pp. 1404-1413

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Salvelinus alpinus Spawning conditions Spawning substrate In this area the substratum seems to be most suitable for spawning. Dwarf males were generally foudndeeper then 15 m thoughout the spawning season. During the first part of the spawning period the distribution of sexually mature females resembled that of the corresponding male groups, however during late spawning (December 8) dwarf females were also found at the depth of 5-15 m No category
Salvelinus alpinus Spawning conditions Spawning site preparation Males fight intensively in the spawning area, and one large, dominant male may fertilize the eggs of several consecutive females within the same territory No category
Salvelinus alpinus Spawning conditions Spawning depth Normal charr males occupied the upper 15 m of the depth gradient in the spawning area from about 3 wk before spawning started until the end of the spawning period. 15.0 m
Salvelinus alpinus Male Male sexual dimorphism Only large males may be strong enough to flaunt bright red spawning colors and still defend a territory Present
Salvelinus alpinus Female Age at sexual maturity 50% of the charr geing seuxally mature at 4-5 year of age [Most males became sexually mature at a higher age than the females] 4.5 years
Salvelinus alpinus Spawning conditions Spawning season The first spawning of normal females were cuaght on November 9, whereas dwarf females did not begin spawning until 2 weeks later. ['November']
Salvelinus alpinus Female Age at sexual maturity 50% of the charr sexually mature at 4-5 year of age [Most males became sexually mature at a higher age than the females] 4.5 year