Food selection of burbot (Lota lota L.) larvae reared in illuminated net cages in mesotrophic Lake Maróz (north-eastern Poland)

• DOI: 10.1007/s10499-013-9707-9
• Publication Date: 2013-10-04T07:03:57Z
• Authors: Grażyna Furgała-S...; Andrzej Skrzypczak; Dariusz Kucharczyk; Roman Kujawa; Andrzej Mamcarz; Daniel Żarski; Katarzyna Targońska
• Keywords: Ichthyoplankton

Feeding and food selection of burbot (Lota lota L.) larvae reared in illuminated cages were studied. The experiment was carried out mesotrophic Lake Maróz, north-eastern Poland, for 6 weeks two successive years. initial stocking density 1,250 (20 DPH) per cage. Food according to the zooplankton groups (Rotifera, Cladocera Copepoda) length classes expressed by Strauss linear selectivity index (L). Zooplankton species composition lake similar seasons study organisms shorter than 0.5 mm prevailed plankton. mean number prey found alimentary tracts increased from about 40 up over 200 during course study. A very large inter-individual variation amount consumed fish noted. Analysis values shows that at beginning first year experiment, preferred copepods, most numerous environment time; later, tended select cladocerans. In second study, more often ate irrespective their quantities environment. During whole did not eat rotifers, even when they cages. Similarly smallest planktonic organisms, measuring length, typically neglected fish, while 0.6–1.0 group frequently selected. There also considerable individual differences between particular specimens preferences.