Volume 32, Issue 4 p. 559-566
Original Article

Reproduction compromises adaptive immunity in a cyprinid fish

Indrikis A. Krams

Corresponding Author

Indrikis A. Krams

Institute of Ecology and Earth Sciences, The University of Tartu, Tartu, Estonia

Institute of Food Safety, Animal Health and Environment BIOR, Rīga, Latvia

Tel.: +371-29465273, [email protected]Search for more papers by this author
Katariina Rumvolt

Katariina Rumvolt

Estonian Marine Institute, University of Tartu, Tartu, Estonia

Search for more papers by this author
Lauri Saks

Lauri Saks

Estonian Marine Institute, University of Tartu, Tartu, Estonia

Search for more papers by this author
Ronalds Krams

Ronalds Krams

Department of Biotechnology, Institute of Life Sciences and Technology, Daugavpils University, Daugavpils, Latvia

Search for more papers by this author
Didzis Elferts

Didzis Elferts

Institute of Food Safety, Animal Health and Environment BIOR, Rīga, Latvia

Department of Botany and Ecology, University of Latvia, Rīga, Latvia

Search for more papers by this author
Jolanta Vrublevska

Jolanta Vrublevska

Department of Biotechnology, Institute of Life Sciences and Technology, Daugavpils University, Daugavpils, Latvia

Search for more papers by this author
Markus J. Rantala

Markus J. Rantala

Department of Biology and Turku Brain and Mind Centre, University of Turku, Turku, Finland

Search for more papers by this author
Sanita Kecko

Sanita Kecko

Department of Biotechnology, Institute of Life Sciences and Technology, Daugavpils University, Daugavpils, Latvia

Search for more papers by this author
Dina Cīrule

Dina Cīrule

Institute of Food Safety, Animal Health and Environment BIOR, Rīga, Latvia

Search for more papers by this author
Severi Luoto

Severi Luoto

English, Drama and Writing Studies, University of Auckland, Auckland, New Zealand

School of Psychology, University of Auckland, Auckland, New Zealand

Search for more papers by this author
Tatjana Krama

Tatjana Krama

Department of Biotechnology, Institute of Life Sciences and Technology, Daugavpils University, Daugavpils, Latvia

Department of Plant Protection, Institute of Agricultural and Environmental Sciences, Estonian University of Life Science, Tartu, Estonia

Search for more papers by this author
First published: 17 May 2017
Citations: 15

Abstract

Vertebrates differ in their ability to mount an adaptive immune response to novel antigens. Bioenergetic resources available to an organism are finite; investment in reproduction compromises immune function and may therefore affect critical life history trade-offs. We tested whether reproduction impairs the ability to produce an antibody response against a novel antigen in roach (Rutilus rutilus). The antigen approach has rarely been used in fish studies, and the ability to produce an antibody response during reproductive season has never been tested in cyprinid fish before. The fish in an experimental group were injected with a Brucella abortus (BA) antigen, while the fish in a control group were injected with an isotonic saline solution. Blood samples were extracted from all the fish to obtain the total number and proportion of blood cells such as lymphocytes, neutrophils and antioxidant glutathione. The groups were tested during the spawning season and one week after it had ended. The roach were unable to mount an immune response during spawning but produced a robust response after it. We conclude that reproduction is costly in roach, as indicated by the increased concentration of neutrophils in fish injected with BA during spawning, as well as the negative associations between neutrophil counts and glutathione levels. This study demonstrates the potential of BA antigen as a research tool in experimental research on fish ecological immunology.