Density, length distribution and diet of age-0 arctic charr Salvelinus alpinus in the surf zone of Thingvallavatn, Iceland

Population densities of age-0 arctic charr (Salvelinus alpinus ) in the surf zone averaged 1.83 and 4.70 fish m super(-2) in August 1984 and June 1985, respectively. Length variation of the littoral fish was low in early summer, increasing in late summer and autumn. Newly emerged charr, similar to 2...

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Bibliographic Details
Published in:Environmental biology of fishes 1988-01, Vol.23 (3), p.183-195
Main Authors: Sandlund, O T, Malmquist, HJ, Jonsson, B, Skulason, S, Snorrason, S S, Jonasson, P M, Gydemo, R, Lindem, T
Format: Article
Language:English
Subjects:
alimentacion de peces
alimentation des poissons
carga ganadera
Chironomidae
fish feeding
Freshwater
iceland
islande
islandia
Pisces
salvelinus
Salvelinus alpinus
stocking density
taux de charge
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Summary:Population densities of age-0 arctic charr (Salvelinus alpinus ) in the surf zone averaged 1.83 and 4.70 fish m super(-2) in August 1984 and June 1985, respectively. Length variation of the littoral fish was low in early summer, increasing in late summer and autumn. Newly emerged charr, similar to 20 mm long, appeared in the stony shallow water zone during both May and June. From length variation and variation in mouth position of the young charr, it is concluded that at least two of the four charr morphs in the lake are present in the surf zone during spring and summer. In August, some of the larger age-0 charr had moved out from the surf zone, into the pelagic and the deeper epibenthic waters. The food of young littoral charr was dominated by large chironomid larvae (instar 3 and 4) and pupae.
ISSN:0378-1909
1573-5133
DOI:10.1007/BF00004909