On the populations of roach (Rutilus rutilus), rudd (Scardinius erythrophthalmus), and their hybriin Esthwaite Water, with notes on the distinctions between them |
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Authors: | Alwyne Wheeler |
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Affiliation: | Department of Zoology, British Museum (Natural History), London SW7 5BD |
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Abstract: | Samples of cyprinid fishes from Esthwaite Water, Westmorland, have been examined and identified as roach ( Rutilus rutilus ), rudd ( Scardinius erythrophthalmus ), with a high degree (37%) of hybridization between these species. The distinguishing features of roach and rudd are discussed in the light of the difficulty of distinguishing the roach x rudd hybrid from the roach. It is concluded that the only reliable characters are the number and external morphology of the pharyngeal teeth. |
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