572. Ferguson, A., K-J.M. Himberg, and G. Svardson. 1978. 



Systematics of the Irish pollan (Coregonus pollan 

 Thompson): An electrophoretic comparison with other 

 holarctic Coregoninae. J. Fish Biol. 12 (3 ): 221-233 . 



573. Ferris, S.D., and G.S. Whitt. 1978. Phylogeny of tetraploid 



catostomid fishes based on the loss of duplicate 

 gene expression. Syst. Zool . 27(2 ): 189-206 . 



574. Fessler, J.L. 1977. Adult returns from smolts originating 



from the matings of wild and hatchery summer steelhead. 

 In T.J. Hassler and R.R. van Kirk (editors), Genetic 

 implications of steelhead management, p. 56. Calif. 

 Coop. Fish. Res. Unit Spec. Rep. 77-1. 



575. Fischer, F. 1880. Zur karpfen-bastard-zuchtung. Dtsch . 



Landw. Press, p. 7. 



576. Fishelson, L. 1966. Cichlidae of the genus Tilapia in 



Israel. Bamidgeh 18:67-80. 



578. , and Y. Loya. 1969. Experiments on rearing 



Tilapia hybrids in brackish water ponds near the 

 Dead Sea. Verh. Int. Ver. Theor. Angew. Limnol . 

 17:602-610. 



577. , and D. Popper. 1968. Experiments in rearing 



fish in saltwaters near the Dead Sea, Israel. FAO 

 Fish. Pap. 5(44):244-245 E-7. 



577a. Fitzgerald, W.J., Jr. 1979. The red-orange Tilapia - a 

 hybrid that could become a world favourite. Fish 

 Farming Int. 6(l):26-27. 



579. Fitzsimons, J.M. 1972. A revision of two genera of 



goodeid fishes (Cyprinodonti formes, Osteichthys) from 

 the Mexican Plateau. Copeia 1972 (4) : 728-756 . 



580. . 1974. Morphological and behavioral intermediacy 



in hybrids of two species of goodeid fishes (Cyprino- 

 dontiformes: Osteichthyes ) from Mexico. Copeia 

 1974(4) :848-855. 



581. Flick, W.A. 1971. New trout for old waters. N.Y. State 



Conserv. 25(6):18-21. 



582. , and D.A. Webster. 1976. Production of wild, 



domestic, and interstrain hybrids of brook trout 

 (Salvelinus fontinalis) in natural ponds. J. Fish. 

 Res. Board Can. 33 (7 ): 1525-1539 . 



583. Focke, E.S. 1976. New colors and color combinations in 



discus. Trop. Fish Hobbyist Publ . 24(240, No. 6): 

 53-55, 58-60. 



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