Biology of Eurasian Ruffe from Slovakia and Adjacent Central European Countries
Identifieur interne : 000E94 ( Main/Exploration ); précédent : 000E93; suivant : 000E95Biology of Eurasian Ruffe from Slovakia and Adjacent Central European Countries
Auteurs : Vladimr Kov [Slovaquie]Source :
- Journal of Great Lakes Research [ 0380-1330 ] ; 1997.
English descriptors
- KwdEn :
Abstract
Research information on Eurasian ruffe from previously published peer-review literature, reports, and previously unavailable or unpublished research from Slovakia and central Europe is synthesized. The synthesis focuses on geographical distribution, habitat requirements, reproductive biology, early development, diet, morphology, age and growth, and karyotype analysis. In Slovakia, the Eurasian ruffe prefers lentic to lotic environment. It is benthic but does not demonstrate any substrate preferences. However, it requires clean and well-oxygenated water. Males attain sexual maturity at standard length 32 to 80 mm, females at 57 to 90 mm. Eurasian ruffe is a polycyclic species with asynchronous ripening of eggs and protracted spawning. It spawns between mid-April and mid-June at water temperatures 7.1 to 20.2C. Absolute individual fecundity is very variable, ranging from 1,000 to 150,000 eggs. The diameter of eggs varies from 0.97 mm to 1.07 mm. Embryos attain 3.35 mm to 3.81 mm at hatching. Ruffe feed mainly on larvae of chironomids, being active throughout the year, including winter. Most individuals attain a maximum age of 6 years, exceptionally 7 or 8 years, and a maximum size of 15 cm, exceptionally 20 cm in total length. In the Danube River, the abundance of the ruffe ranges from 49 to 4,254 ind/ha in side-arms, and from 378 to 14,934 ind/ha in oxbow lakes. Ruffe is a prey species for large piscivores, such as pike and pikeperch. Fish eggs have not been found in stomachs of ruffe from the Danube. Therefore, the only impact of the species on local fish assemblages can be competition for food.
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DOI: 10.1016/S0380-1330(98)70813-5
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The synthesis focuses on geographical distribution, habitat requirements, reproductive biology, early development, diet, morphology, age and growth, and karyotype analysis. In Slovakia, the Eurasian ruffe prefers lentic to lotic environment. It is benthic but does not demonstrate any substrate preferences. However, it requires clean and well-oxygenated water. Males attain sexual maturity at standard length 32 to 80 mm, females at 57 to 90 mm. Eurasian ruffe is a polycyclic species with asynchronous ripening of eggs and protracted spawning. It spawns between mid-April and mid-June at water temperatures 7.1 to 20.2C. Absolute individual fecundity is very variable, ranging from 1,000 to 150,000 eggs. The diameter of eggs varies from 0.97 mm to 1.07 mm. Embryos attain 3.35 mm to 3.81 mm at hatching. Ruffe feed mainly on larvae of chironomids, being active throughout the year, including winter. Most individuals attain a maximum age of 6 years, exceptionally 7 or 8 years, and a maximum size of 15 cm, exceptionally 20 cm in total length. In the Danube River, the abundance of the ruffe ranges from 49 to 4,254 ind/ha in side-arms, and from 378 to 14,934 ind/ha in oxbow lakes. Ruffe is a prey species for large piscivores, such as pike and pikeperch. Fish eggs have not been found in stomachs of ruffe from the Danube. Therefore, the only impact of the species on local fish assemblages can be competition for food.</div></front></TEI><affiliations><list><country><li>Slovaquie</li></country></list><tree><country name="Slovaquie"><noRegion><name sortKey="Kov, Vladimr" sort="Kov, Vladimr" uniqKey="Kov V" first="Vladimr" last="Kov">Vladimr Kov</name></noRegion><name sortKey="Kov, Vladimr" sort="Kov, Vladimr" uniqKey="Kov V" first="Vladimr" last="Kov">Vladimr Kov</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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