Biology of Ruffe ( Gymnocephalus cernuus (L.))A Review of Selected Aspects from European Literature
Identifieur interne : 000E93 ( Main/Exploration ); précédent : 000E92; suivant : 000E94Biology of Ruffe ( Gymnocephalus cernuus (L.))A Review of Selected Aspects from European Literature
Auteurs : Franz Hlker [Allemagne] ; Ralf Thiel [Allemagne]Source :
- Journal of Great Lakes Research [ 0380-1330 ] ; 1997.
Descripteurs français
- Wicri :
- geographic : Europe.
English descriptors
- KwdEn :
Abstract
The focus of this synthesis is the ruffe research conducted in Europe during the last 100 years. Literature data about habitat, feeding ecology, growth, daily ration, production, and commercial value of ruffe from different types of waters were compiled. In some European estuaries, ruffe were formerly an important commercial species. Today, ruffe still have some commercial importance in eastern European countries, e.g., Russia. Ruffe are food generalists with a tendency to feed on benthos, but in tidal estuaries they are rather planktivorous. They have the advantage of being able to select moving prey items under relatively dim light or high turbidity conditions as a result of their excellent near-field sensory resolution. Under these conditions, they are able to compete with other species for zooplankton and small fish. In the clear and less productive waters of many lakes, rivers and reservoirs, ruffe are better competitors for benthic macroinvertebrates than perch and roach. A multivariable consumption model has been developed to allow rough estimates of daily ration in dependence from water temperature and fish size. Although ruffe occur both in freshwater and brackish habitats, they usually grow better in estuaries than in fresh water. Some authors agree that, compared to fresh water, ruffe utilize the better nutritional opportunities in brackish water, which ultimately induces better growth.
Url:
DOI: 10.1016/S0380-1330(98)70812-3
Affiliations:
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Literature data about habitat, feeding ecology, growth, daily ration, production, and commercial value of ruffe from different types of waters were compiled. In some European estuaries, ruffe were formerly an important commercial species. Today, ruffe still have some commercial importance in eastern European countries, e.g., Russia. Ruffe are food generalists with a tendency to feed on benthos, but in tidal estuaries they are rather planktivorous. They have the advantage of being able to select moving prey items under relatively dim light or high turbidity conditions as a result of their excellent near-field sensory resolution. Under these conditions, they are able to compete with other species for zooplankton and small fish. In the clear and less productive waters of many lakes, rivers and reservoirs, ruffe are better competitors for benthic macroinvertebrates than perch and roach. A multivariable consumption model has been developed to allow rough estimates of daily ration in dependence from water temperature and fish size. Although ruffe occur both in freshwater and brackish habitats, they usually grow better in estuaries than in fresh water. Some authors agree that, compared to fresh water, ruffe utilize the better nutritional opportunities in brackish water, which ultimately induces better growth.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Hambourg</li></region><settlement><li>Hambourg</li></settlement></list><tree><country name="Allemagne"><region name="Hambourg"><name sortKey="Hlker, Franz" sort="Hlker, Franz" uniqKey="Hlker F" first="Franz" last="Hlker">Franz Hlker</name></region><name sortKey="Hlker, Franz" sort="Hlker, Franz" uniqKey="Hlker F" first="Franz" last="Hlker">Franz Hlker</name><name sortKey="Thiel, Ralf" sort="Thiel, Ralf" uniqKey="Thiel R" first="Ralf" last="Thiel">Ralf Thiel</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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