Relationship Between Water Temperature and Immune Response of Grass Carp (Ctenopharyngodon idellus C. et V.)

Abstract

The relationship between immune response of grass carp (Ctenopharygodon idellus) and water temperature was investigated according to changes in antiserum neutralization titer (ANT) and percent relative protection (PRP) of fish immunized with killed cell-cultured vaccine against Fish Reovirus (Vaccine CFRV). Experimental results showed that: 1) the water temperature of 10°C is the critical point in the immunization of grass carp with Vaccine CFRV; 2) the immune response was inhibited below 10°C and enhanced with in­crease in water temperature up to 32°C, after which it decreased; and 3) water tempera­ture at the inductive phase was one of the key factors that determined the occurrence and strength of the immune response.