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Water quality and stocking density as stressors of channel catfish (Ictalurus punctatus Raf.)
Klinger, H.; Delventhal, H.; Hilger, V. (1983). Water quality and stocking density as stressors of channel catfish (Ictalurus punctatus Raf.). Aquaculture 30(1-4): 263-272
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486, more
Peer reviewed article  

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Keywords
    Biological stress; Fish culture; Hematology; Stocking density; Water quality; Ictalurus punctatus (Rafinesque, 1818) [WoRMS]; Brackish water; Fresh water

Authors  Top 
  • Klinger, H.
  • Delventhal, H.
  • Hilger, V.

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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