Fish Diseases and Management

2.2.10 Lymphoid tissue

2.2.11 Lymphoid tissue

WBCs are generated or synthesized or maintained by lymphoid tissue.

1) Renal lymphoid tissue

2) Splenic lymphoid tissue

3) Thymic lymphoid tissue

Pathology

Renal tissue associated with haemopoietic and lymphatic functions are mainly present in head or anterior kidney. Any inflammation affecting renal, splenic and thymus tissue will have an effect on blood vascular system. Thus RBC production is less and often results in anaemia. If spleen and thymus are affected it results in change in immune response of the animal.