1806. , Z.T. Romanova, B.E. Petrov, and Z.A. Shatrova. 



1969. Experience in breeding ropsha hybrid carp in the 

 northwestern RSFSR. (Opyt organizatsii pleminnoi 

 raboty s ropshinskimi gibridnymi karpami na severo- 

 zapade RSFSR.). In B.I. Cher fas (editor), Genetika, 

 seleksiya i gibridizatsiya ryb, p. 251-256. 



Izd. "Nauka" Moscow. 



1807. Zorach, T. 1967. Systematics of the darters of the subgenus 



Nothonotus (Etheostoma, Percidae). Ph.D. Thesis, Cornell 

 Univ., Ithaca, N.Y., 197 p. 



1808. Zukal, R. 1974. Attempted breeding of a cichlid cross- 



breed. Pet Fish Mon. 8(11) : 549-550. 



155 



