FISHERY BULLETIN: VOL. 71, NO. 1 



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Figure 1.— 13 March 1969. Photo- 

 micrograph of wild herring blood 

 showing macrocytosis of the young 

 cells. Early polychromatics are prev- 

 alent. Arrows point to an inclusion 

 in a middle polychromatic and in a 

 mature red cell. 



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# 



M 



•* W 



^ MP 



% ^  



EP 



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Figure 2.— 13 March 1969. Photo- 

 micrograph of normal wild herring 

 blood showing the absence of in- 

 clusions. 



EP — early polychromatic eryth- 

 rocyte 



MP — middle polychromatic 

 erythrocyte 



M — mature erythrocyte 



N — neutrophil 



Th — thrombocyte 



immature red cells with inclusions found in only 

 6% of the mature red cells; the other affected 

 herring had 12% immature red cells with inclu- 

 sions in 50% of the immature and 20% of the 

 mature cells. 



Nearly 7% (5/76) of the wild herring sam- 

 pled on 8 July from Boothbay Harbor contained 

 inclusions, and a few cells in several herring 



contained two inclusions. Four of the five af- 

 fected herring contained over 70% immature red 

 cells, the other 15%. Both abnormally large 

 and small erythrocytes and many disintegrated 

 cells were present. Anisopoikilocytosis (abnor- 

 mal cell sizes and shapes) of all red cell devel- 

 opmental stages was evident. The nuclei of 

 many affected erythrocytes contained two or 



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