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Dynamics of the Pikeperch, Stizostedion lucioperca (L.), in Lake Balaton

✍ Scribed by Dr. Péter Biró

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
997 KB
Volume
70
Category
Article
ISSN
1434-2944

No coin nor oath required. For personal study only.

✦ Synopsis

The pikeperch populations inhabiting three distinct water areas of Lake Balaton differ in regard of growth. Due t o stock depletion, pikeperch in the NE-basin of the lake grew considerably faster than ten years ago. The annual rate of growth in length (VON BERTALANFFY'S K ) varied between 0.09 and 0.19. The specific rate of growth in length (GL) ranged from 0.16 t o 0.23 and that of growth in weight (C W ) from 0.52 t o 0.69. Length and age-structures of the stocks differed significantly between different areas and years, but the overwhelming majority of the stocks consisted of age-groups IV-V (98.2-99.3 %). From NE to SW, the rates of survival were 34, 29 and 70 O/o, respectively. These differences, and the differences in growth resulted in changes in the productive capncky of the stocks. The ratios of production and biomass were 59 O/,, (NE-basin), 63 (central basin) and 39 O/o (SW-basin), respectively. The magnitudes of production varied inversely. The 50 ('i0 retention lengths of the seine nets used in Lake Balaton were 35.0, 35.7 and 42.5 cm with weights of 572, 655 and 1019 g, respectively.

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