lar to analogous forma described from other fishes by Puchkov (59), Golodetsi (14), Drabklna and 

 Antlpova. 



The dimensions of the blood cells of the Murmansk herring are different than those of, for 

 example, bream, plkeperch and trout (according to Drabklna) (Table 11). 



TABLE 11. THE SIZE OF FISH BLOOD CELLS IN MU. 



Chelsina (68) divided 53 species of fish from various families into 5 groups according to the 

 leucocyte formula. For our work such a classification is not necessary. According to the compo- 

 sition of the leucocytes, Chelsina referred the Clupeids to group I, characterized by both lympho- 

 cytes and monoc3rtes. In the blood of the Muimansk herring, lymphocytes (Figure 13, a), mono- 

 cytes (Figure 13 b), polymorpho -nuclear leucocytes (Figure 13 B) and eoslnophiles are present. 



If the grouping of Chelsina is followed, the Murmansk herring may be referred to the groups 

 n and m, and in addition to group I. 



2^varzin (20) characterized the classification of fish made by Chelsina as being very formal. 

 In his opinion the distribution of fish families according to the blood cell groups is entirely occa- 

 sional . 



From the material collected in 1947 we have tried to explain the correlation between the 

 amoimt of hemoglobin and the age, fat content, and maturity stages of the ovaries. The investi- 

 gation showed that In herring 5-8 years old the mean quantity of hemoglobin was 53.3% (3 individ- 

 uals), in herring 9-13 years old 61.9% (30 individuals). Thus the hemoglobin content of the blood 

 increases with age . TTils increase takes place simultaneously with the accumulation of fat on the 

 Intestines. One mark (ball) of fat corresponds with 51.7% of hemoglobin, two marks- 67%, three 

 marks- 65.6%. (Editor's note: see Rudakova's article in this volume). 



The amount of hemoglobin Is also strongly correlated with the maturity stages of the sexual 

 products. For example, stages V-VI correspond with 42.9% of hemoglobin, stage n, -61.4%, 

 stage ni, - 64.5%. In individuals with trace of the recent spawning (stages VI-II) the hemoglobin 

 content is very low. 



According to Table 12, the hemoglobin content of the blood from Murmansk herring varies 

 considerably during the year. The maximum quantity of hemoglobin corresponds with the period 

 of maximum fat content and condition (October -November). 



After the spawning (May-June), when the fish has just begun to feed vigorously, and has 

 scarcely begun to establish the metabolic level, the hemoglobin content is comparatively low. 



243 



