Population structure and feeding characteristics of Volga pikeperch, Sander volgensis (Pisces, Percidae), in Lake Balaton

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Abstract

Growth, population structure, abundance, production, and feeding of Volga pikeperch were studied in Lake Balaton. The population was mainly comprised of age-groups 0+ (59%) and 1+ (18%), while the total share of age-groups 6+ and older was less than 1%. Mean back-calculated standard lengths for age-groups 0+-9+ were 67, 123, 144, 196, 233, 256, 283, 316, 350, and 369 mm, respectively. The instantaneous rate of growth in weight was lower at age 2+ than it was at age 3+ and 4+, suggesting unfavourable conditions for Volga pikeperch 120-160 mm in size. In autumn, the average abundance of Volga pikeperch was 34 ind. ha-1, the biomass 1.04 kg ha-1, and the production 0.76 kg ha-1 in the SW basin of Lake Balaton. Based on the diet, three phases can be distinguished during the ontogeny. Zooplanktivory is characteristic for the early juvenile stage up to 50 mm in size. At the size of 50-150 mm the diet becomes heterogeneous, consisting of zooplankters, benthic invertebrates, and fish. The third phase is the piscivory which becomes a determinant at over 150 mm in size. In this phase cannibalism was also significant, as 21.9% of consumed fish were conspecifics.

Original languageEnglish
Pages (from-to)503-510
Number of pages8
JournalHydrobiologia
Volume506-509
DOIs
Publication statusPublished - Nov 15 2003

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Percidae
Pisces
population structure
lakes
lake
piscivory
diet
cannibalism
fish
ontogeny
invertebrate
autumn
invertebrates
Sander volgensis
biomass
basin

Keywords

  • Feeding
  • Growth
  • Ontogenetic diet shift
  • Population structure
  • Sander volgensis

ASJC Scopus subject areas

  • Aquatic Science

Cite this

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title = "Population structure and feeding characteristics of Volga pikeperch, Sander volgensis (Pisces, Percidae), in Lake Balaton",
abstract = "Growth, population structure, abundance, production, and feeding of Volga pikeperch were studied in Lake Balaton. The population was mainly comprised of age-groups 0+ (59{\%}) and 1+ (18{\%}), while the total share of age-groups 6+ and older was less than 1{\%}. Mean back-calculated standard lengths for age-groups 0+-9+ were 67, 123, 144, 196, 233, 256, 283, 316, 350, and 369 mm, respectively. The instantaneous rate of growth in weight was lower at age 2+ than it was at age 3+ and 4+, suggesting unfavourable conditions for Volga pikeperch 120-160 mm in size. In autumn, the average abundance of Volga pikeperch was 34 ind. ha-1, the biomass 1.04 kg ha-1, and the production 0.76 kg ha-1 in the SW basin of Lake Balaton. Based on the diet, three phases can be distinguished during the ontogeny. Zooplanktivory is characteristic for the early juvenile stage up to 50 mm in size. At the size of 50-150 mm the diet becomes heterogeneous, consisting of zooplankters, benthic invertebrates, and fish. The third phase is the piscivory which becomes a determinant at over 150 mm in size. In this phase cannibalism was also significant, as 21.9{\%} of consumed fish were conspecifics.",
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AU - Specziár, A.

AU - Bíró, P.

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N2 - Growth, population structure, abundance, production, and feeding of Volga pikeperch were studied in Lake Balaton. The population was mainly comprised of age-groups 0+ (59%) and 1+ (18%), while the total share of age-groups 6+ and older was less than 1%. Mean back-calculated standard lengths for age-groups 0+-9+ were 67, 123, 144, 196, 233, 256, 283, 316, 350, and 369 mm, respectively. The instantaneous rate of growth in weight was lower at age 2+ than it was at age 3+ and 4+, suggesting unfavourable conditions for Volga pikeperch 120-160 mm in size. In autumn, the average abundance of Volga pikeperch was 34 ind. ha-1, the biomass 1.04 kg ha-1, and the production 0.76 kg ha-1 in the SW basin of Lake Balaton. Based on the diet, three phases can be distinguished during the ontogeny. Zooplanktivory is characteristic for the early juvenile stage up to 50 mm in size. At the size of 50-150 mm the diet becomes heterogeneous, consisting of zooplankters, benthic invertebrates, and fish. The third phase is the piscivory which becomes a determinant at over 150 mm in size. In this phase cannibalism was also significant, as 21.9% of consumed fish were conspecifics.

AB - Growth, population structure, abundance, production, and feeding of Volga pikeperch were studied in Lake Balaton. The population was mainly comprised of age-groups 0+ (59%) and 1+ (18%), while the total share of age-groups 6+ and older was less than 1%. Mean back-calculated standard lengths for age-groups 0+-9+ were 67, 123, 144, 196, 233, 256, 283, 316, 350, and 369 mm, respectively. The instantaneous rate of growth in weight was lower at age 2+ than it was at age 3+ and 4+, suggesting unfavourable conditions for Volga pikeperch 120-160 mm in size. In autumn, the average abundance of Volga pikeperch was 34 ind. ha-1, the biomass 1.04 kg ha-1, and the production 0.76 kg ha-1 in the SW basin of Lake Balaton. Based on the diet, three phases can be distinguished during the ontogeny. Zooplanktivory is characteristic for the early juvenile stage up to 50 mm in size. At the size of 50-150 mm the diet becomes heterogeneous, consisting of zooplankters, benthic invertebrates, and fish. The third phase is the piscivory which becomes a determinant at over 150 mm in size. In this phase cannibalism was also significant, as 21.9% of consumed fish were conspecifics.

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