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VON BERTALANFFY GROWTH CURVE OF THE RUDD (Scardinius erythrophthalmus L.) FROM THE LAKE KLJU I BRDO, CENTRAL CROATIA

Keywords: rudd , growth curve , von bertalanffy

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Abstract:

The rudd is a cyprinid herbivorous freshwater fish. The samples of rudd have been taken from the Klju i brdo“ location. The arithmetic mean of length for each age group was determined according to Peterson, Danish ichthyologist. As back calculation of average length of some populations was done by von Bertalanffy growth function (VBGF) Lt=L∞ (1-e-K(t-t0)), the equation could be expressed by the following formula Lt=17.82 (1-e-1.0431(t-0.579)). The von Bertalanffy growth function is helpful because its parameters help in comparing different fish populations. According to growth and age, the rudd has been divided in four age groups. The first group represents the youngest fish with average growth of L1=11.603 cm, the second group L2=15.921 cm, the third group L3=19.295 cm while the average growth of the fourth group, the oldest one, was L4=19.998 cm. The growth of rudd at a chosen location has been compared to the already published data of rudd growing at other locations. Growth performance at chosen location was around 5 which coincides with the data taken from the literature. This research proves that investigated water of the Klju i brdo“ location is favourable for the growth and the development of rudd.

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