Feeding biology of burbot, Lota lota (L.) : adaptation to profundal lifestyle?
The aims of this thesis are to determine the role of burbot in the freshwater ecosystem and clarify how the feeding biology and behaviour have been affected by the profundal life style of burbot. The gastric evacuation rates of burbot fed single fish meals were measured under various experimental conditions. The gastric evacuation rates of the burbot were affected by water temperature and meal size in the temperature range of l.3-12.6°C, as has earlier been observed about several fish species. However, the stomach emptying rates were low compared to other freshwater fish species. As stomach emptying is prolonged, the stomach can act as a reserve of food during the periods of low prey availability. In the experimental conditions, the estimated optimum temperature for food intake (g g⁻¹) was 13.6°C. Food consumption estimates suggest that burbot are potential competitors for food with other piscivorous fish. Seasonal changes in burbot's diet may, however, decrease their impact on prey fish species. Indeed, the profundal life style provides the adaptation to nearly zero illumination and low temperatures. Ambush feeding behaviour with low metabolic rates are characteristic of the burbot, a major predator in various freshwaters. The burbot has adapted to use dark periods of the day for activity during most of the year. Food composition and stomach fullness data suggest that burbot are periodic and opportunistic feeders, that have adapted to prey under unpredictable food conditions.
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ISBN
978-951-39-8748-0Julkaisuun sisältyy osajulkaisuja
- Artikkeli I: Pääkkönen, J.-P., & Marjomäki, T. (1997). Gastric evacuation rate of burbot fed single-fish meals at different temperatures. Journal of Fish Biology, 50(3), 555-563. DOI: 10.1111/j.1095-8649.1997.tb01949.x
- Artikkeli II: Pääkkönen, J.-P., Marjomäki, T., & Myyrä, R. (1999). The effect of meal size on the rate of gastric evacuation of burbot, Lota lota (L.). Ecology of Freshwater Fish, 8(1), 49-54. DOI: 10.1111/j.1600-0633.1999.tb00052.x
- Artikkeli III: Pääkkönen, J.-P., & Marjomäki, T. (2000). Feeding of burbot, Lota lota (L.), at different temperatures. Environmental Biology of Fishes, 58(1), 109-112. DOI: 10.1023/A:1007611606545
- Artikkeli IV: Pääkkönen, J.-P., & Lyytikäinen, T. (2000). Oxygen consumption of Burbot (Lota lota) fed different rations of vendace (Coregonus albula). Journal of Applied Ichthyology, 16(6), 262-265. DOI: 10.1046/j.1439-0426.2000.00251.x
- Artikkeli V: Pääkkönen, J.-P., Marjomäki, T., & Laitinen, M. (2000). Total activity of burbot Lota lota (L.) measured with a bioelectronic monitoring system: seasonal differences in activity length. Burbot: Biology, Ecology, and Management (Fisheries Management Section of the American Fisheries Society), 1(1), 38-47.
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