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 language | English |
|---|---|
| Pages (from-to) | 503-510 |
| Number of pages | 8 |
| Journal | Hydrobiologia |
| Volume | 506-509 |
| DOIs | |
| Publication status | Published - Nov 15 2003 |
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Keywords
- Feeding
- Growth
- Ontogenetic diet shift
- Population structure
- Sander volgensis
ASJC Scopus subject areas
- Aquatic Science
Cite this
Population structure and feeding characteristics of Volga pikeperch, Sander volgensis (Pisces, Percidae), in Lake Balaton. / Specziár, A.; Bíró, P.
In: Hydrobiologia, Vol. 506-509, 15.11.2003, p. 503-510.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Population structure and feeding characteristics of Volga pikeperch, Sander volgensis (Pisces, Percidae), in Lake Balaton
AU - Specziár, A.
AU - Bíró, P.
PY - 2003/11/15
Y1 - 2003/11/15
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.
KW - Feeding
KW - Growth
KW - Ontogenetic diet shift
KW - Population structure
KW - Sander volgensis
UR - http://www.scopus.com/inward/record.url?scp=17744406759&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17744406759&partnerID=8YFLogxK
U2 - 10.1023/B:HYDR.0000008535.98144.1e
DO - 10.1023/B:HYDR.0000008535.98144.1e
M3 - Article
VL - 506-509
SP - 503
EP - 510
JO - Hydrobiologia
JF - Hydrobiologia
SN - 0018-8158
ER -