210 



Fishery Bulletin 88(1). 1990 



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80 



70 



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 Q. 



<70 71-80 81-90 



FORK LENGTH (cm) 



>90 



Figure 3 



Percentage difference in cross-sectional area of the medial sections 

 of right and left testes of South Pacific albacore, by fork-length. 



right and left testes showed that the sizes of both 

 gonads increase exponentially with increasing length 

 of the fish, and that the area of the right testis does 

 not increase at a faster rate than the left. 



In summary, the right testis is predominately larger 

 than the left; however, they both appear to increase 

 in size at similar rates as the fish increases in length. 



Histology of testes 



The albacore testis has a lohular-type cellular ar- 

 rangement, characteristic of most teleosts (Billard et 

 al. 1982). We classified the germ cells into the follow- 

 ing phases of development: spermatogonia, primary 

 spermatocytes, secondary spermatocytes, spermatids, 

 and spermatozoa. 





A. 



B^ 



PS, 





.V* 



c. 



sm 



■^1^ 

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Figure 4 



Spermatogenic cells oli.servcd in testes of South Pacific albacore. 

 (A) Spermatogonia (sg) situated on lobule wall ( x 400); (B) primary 

 spermatocyte (ps) cells and secondary spermatocyte (ss) cells (x GOO); 

 (C) spermatids (sm) and spermatozoa (s) (x400). 



