All about fish’s white blood cells.

If you want to see pictures of fish white blood cells prior to reading the abstract, I’ve some on my Facebook “Fin” page –
The granulocytes of fishnext term

P.M. Hinea

a Fisheries Research Centre, Ministry of Agriculture and Fisheries, P.O. Box 297, Wellington, New Zealand

Received 16 June 1991; Accepted 20 September 1991. Available online 10 August 2007.

The occurrence and functions of granulocytes in previous termfishesnext term varies between and within groups. Primitive groups (agnathans, holocephalans, elasmobranchs) all have eosinophils with homogeneous round granules. Elasmobranchs also have eosinophils with granules containing an axial crystalline rod, which is the sole eosinophil type present in lungfish. Comparative study suggests that in elasmobranchs and lungfish, heterophils and different forms of eosinophil are all of the eosinophil lineage. Agnathans, holocephalans, dogfishes and lungfish possess fine granulocytes that may be related to neutrophils of teleosts and mammals. Holosteans and chondrosteans have eosinophils and neutrophils, and as in some elasmobranchs and lungfish, basophils are relatively common. Teleosts have neutrophils which are ultrastructurally, and possibly functionally, similar to mammalian neutrophils. More rarely they have cells with elongated granules similar to elasmobranch and reptilian heterophils. Teleost eosinophils have large round homogeneous granules, and cytochemical and functional studies indicate that in some groups, particularly cyprinids, these cells represent an undifferentiated eosinophil/basophil lineage. Roles in inflammation, enzyme cytochemistry, function and evolutionary trends are discussed.

Key words: previous termfishnext term granulocytes; eosinophils; basophils; neutrophils; heterophils; ultrastructure; enzyme cytochemistry

Full article can be viewed here:

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