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Influence of Feed Deprivation on Hematology, Macrophage Chemotaxis, and Resistance to Edwardsiella ictaluri Challenge of Channel Catfish
Author(s) -
Lim Chhorn,
Klesius Phillip H.
Publication year - 2003
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(2003)015<0013:iofdoh>2.0.co;2
Subject(s) - edwardsiella ictaluri , catfish , ictalurus , biology , zoology , ictaluridae , fish <actinopterygii> , hematology , weight gain , immune system , medicine , body weight , fishery , immunology , endocrinology
Two experiments were conducted to evaluate the effects of four feeding regimens (no feeding, feeding once daily to satiation, feeding every other day to satiation, and no feeding for 3 weeks followed by feeding once daily to satiation during the fourth week) on the growth, feed efficiency, hematology, immune response, and resistance to Edwardsiella ictaluri of channel catfish Ictalurus punctatus . Feed efficiency ratios were a reflection of weight gain and differed significantly ( P < 0.05) among treatments in one experiment but not the other. Survival rates did not differ significantly among feeding regimens in either experiment. Fish that were not fed or fed only in the fourth week were anemic. Macrophage chemotaxis in response to an E. ictaluri exoantigen was significantly different among treatments, with the lowest response in the group that was not fed and the highest in the group that was fed daily. Mortality from enteric septicemia of catfish (ESC) was significantly lower for fish that were fed daily or every other day both before and after challenge than for fish that were not fed before and after challenge or not fed before challenge and fed afterwards. This study shows that fish that were fed less than to satiation once daily gained less weight, became anemic, and had reduced macrophage chemotaxis. Fish fed daily or every other day before or after challenge were more resistant to ESC than nonfed fish.