A natural hybrid between rudd Scardinius erythrophthalmus and bream Abramis brama from Lake Akersvann, SE Norway
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Abstract
An examination of 83 cyprinid specimens collected in Lake Akersvann, SE Norway in Sept. 1984 and in June and Sept. 1985 showed these to be natural hybrids between Scardinius erythrophthalmus and Abramis brama. This is the first report from Norway of this hybrid. The colouration in fresh specimens and the morphometric characters described are intermediate between those of the parentals and largely in agreement with previous descriptions of this hybrid. It is suggested that the hybrid is sterile and thus only is present as the F1 generation. It is concluded that interference of young, ripe bream males, - possibly competitively expelled from the bream spawners -, in the shoals of early spawning rudd deficit of males is the main cause for hybridization. A hybrid vigour in early growth is pointed out, but an age dependent decrease in hybrid growth vigour is also indicated.
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