The effect of ligulosis on the growth of bream (Abramis brama L.) in Lake Balaton

Garádi, Péter and Biró, Péter (1975) The effect of ligulosis on the growth of bream (Abramis brama L.) in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 42. pp. 165-173. ISSN 0365-3005

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Abstract

On the basis of their scales, the growth of 100 two-to eight-summer-old breams has been studied. This specimens invaded with Ligula plerocercoids have been caught by fishermen at the environs of Fonyód in July 1974. It was concluded that 1. The relationship between the total caudal radii of scales and the standard lengths may be described by a linear regression. It cuts 1.2 cm from the abscissa. The annuli on the scales developed irregularly in connection with the extent of Ligula invasion. About a half of the scales studied were deformed and regenerated. 2. Based on the standard lengths back-calculated from the annuli of the scales it could be established that breams invaded with plerocercoids of Ligula intestinalis stunt in growth as compared to the sound specimens. Their different pattern of growth in weight has evenly been observed from the length-weight relationship. During the first five years of their development the growth of bream in Lake Balaton has been significantly hindered by ligulosis.

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