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Definition of Term

(English) A condition characterised by a deficiency of haemoglobin, packed cell volume and/or erythrocytes. The more important anaemias in fish are normocytic anaemia caused by acute haemorrhaging, bacterial and viral infections, and metabolic diseases resulting in red cell destruction; microcytic anaemia due to chronic haemorrhaging, e.g., caused by external parasites, iron deficiency and deficiency of certain haematopoietic factors; and macrocytic anaemia (e.g absence of juvenile cells; too many mature cells) resulting from an increase in haematopoietic activity in the spleen and kidney.

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