Figure 2. — Immunodiffusion comparison of Vibrio anguil- 

 larum 775 and Vibrio sp. 1669. Wells 1, 3, and 5 contain V. an- 

 guillarum 775 sonicate and wells 2, 4, and 6 contain Vibrio sp. 

 1669 sonicate. The center well contains rabbit anti-V. anguil- 

 larum 775 serum. 



V. anguillarum lib in rabbit anti-Viftrto sp. 1669 

 serum was removed by absorption, a titer of 16 

 against 1669 remained (Table 2), indicating that 

 Vibrio sp. 1669 also contains antigenic determin- 

 ants not present on V. anguillarum 115. 



Whether a vaccine containing antigens from 

 both vibrios would be more protective than vac- 

 cines containing antigens from only one of the 



Table 2. — Agglutinin titers of rabbit anti-Vj6rto sp. 1669 

 serum unabsorbed and absorbed with V. anguillarum 775 

 antigen. 



vibrios is not known. This possibility is currently 

 being investigated. Deoxyribonucleic acid homol- 

 ogy experiments are also in progress to better 

 clarify the taxonomic relation of the two vibrios. 



Literature Cited 



ANDERSON. J. I. W., AND D. A. CONROY. 



1970. Vibrio disease in marine fishes. In S. F. Snieszko 

 (editor), A Symposium on Diseases of Fishes and 

 Shellfishes, p. 266-272. Am. Fish. Soc., Spec. Publ. 5. 



EVELYN, T. P. T. 



1971. First records of vibriosis in Pacific salmon cultured 

 in Canada, and taxonomic status of the responsible bac- 

 terium, Vibrio anguillarum. J. Fish. Res. Board Can. 

 28:517-525. 



NOVOTNY. A. J. 



1975. Net-pen culture of Pacific salmon in marine waters. 

 Mar. Fish. Rev. 37(l):36-47. 



Pacha, R. e., and E. j. Ordal. 



1967. Histopathology of experimental columnaris disease 

 in young salmon. J. Comp. Pathol. 77:419-423. 

 RUCKER, R. R. 



1959. Vibrio infections among marine emd fresh-water 

 fish. Prog. Fish-Cult. 21:22-25. 

 SiNDERMANN, C. J. 



1966. Diseases of marine fishes. Adv. Mar. Biol. 4:1-89. 



Lee W. Harrell 



anthony j. novotny 



Michael H. Schiewe 



Harold O. Hodgins 



Northwest Fisheries Center 

 National Marine Fisheries Service, NOAA 

 2725 Montlake Boulevard East 

 Seattle, WA 98112 



RELATION OF FISH CATCHES IN 

 GILL NETS TO FRONTAL PERIODS 



A study was conducted in 1972 relating gill net 

 catches of fishes to webbing material, time of day, 

 and water depth in St. Andrew Bay, Fla. (Pristas 

 and Trent^). While conducting the study, Pristas 

 and Trent observed that catches in the nets ap- 

 peared to be greater when atmospheric fronts 

 moved through the area in the autumn. We de- 

 cided to test the hypothesis that catches of fishes 

 in gill nets increase during fi-ontal periods. Ex- 

 perimental data were collected in September- 

 December 1973, and the results of the analysis 

 are presented in this paper. 



'Pristas, P. J., and L. Trent. 1974. Comparisons of catches of 

 fishes in gill nets in relation to webbing material, time of day, 

 and water depth in St. Andrew Bay, Florida. Unpubl. manuscr. 



449 



