Water quality and stocking density as stressors of channel catfish (Ictalurus punctatus Raf.)
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622, meer
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| Trefwoorden |
Biological stress
Cultures > Fish culture
Hematology
Stocking density
Water quality
Ictalurus punctatus (Rafinesque, 1818) [WoRMS]
Brak water; Zoet water |
| Auteurs | | Top |
- Klinger, H.
- Delventhal, H.
- Hilger, V.
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| Abstract |
The influences of heated recirculated water and well water on three stocking densities of channel catfish (Ictalurus punctatus Raf.) were compared, based on several physiological and hematological parameters. Controls were kept in well water only. The leucocyte count of fish kept in well water generally decreased, and their thrombocyte, lymphocyte and granulocyte counts were lower at higher stocking densities. In addition, a slight haemoconcentration was observed. The fish kept in recirculated water showed a decrease only in thrombocyte count. In contract, the blood lactate levels were always high. This may have been caused by the anesthetization. The alterations found are regarded as symptoms of the "general adaptation syndrome" induced by the stocking rates. High lymphocyte and granulocyte counts among the fish in reused water are signs of local adaptations to reduced water quality. |
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