Growth investigation of ruffe (Acerina cernuaL.) in Lake Balaton

Biró, Péter (1971) Growth investigation of ruffe (Acerina cernuaL.) in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 38. pp. 131-142. ISSN 0365-3005

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Abstract

The growth rate of ruffe has been investigated by means of scalimetric measurements in Lake Balaton. It can be established that: 1. Annual rings of the scales are regularly formed in the majority of cases, accessory rings are rare, whereas injured, regenerated scales are frequent. 2. A rather linear connection exists between the standard length and the total oral radius of the scales. 3. The specific values of body weight calculated on the basis of the parabola describing the allometric relation of body length and weight for both sexes hardly differ from those obtained by direct measurements. The value of the allometric exponent is 3.0855. 4. The growth of ruffe is slow in Lake Balaton, it is of about the same rate in the first 4 years (up to age group 3+). The slow growth is probably bears a direct relation to the amount of food. 5. Among the mathematical models applied for the description of the growth rate of the standard length, Krüger’s (1965) proved to be more reliable th an Bertalanffy’s (1957), however, there are no great differences between the values calculated by the two methods. 6. The growth rate of standard length and weight of ruffe in Lake Balaton is slower as compared to those of waters abroad. It is near to the values observed in the waters of Czechoslovakia.

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