FISHERY BULLETIN: VOL. 86, NO. 2 



tial grilse have been reported from the Grand 

 Bank in offshore fisheries in the Northwest At- 

 lantic (Reddin 1985), and it has been suggested 

 that stocks maturing as grilse in the Bay of 

 Fundy may not leave the general area throughout 

 their entire marine life (Jessop 1976). 



Knowledge on the marine biology of Atlantic 

 salmon postsmolts has been a neglected area of 

 research. Their continual presence in sea surface 

 waters could prove to be extremely valuable in 

 forecasting salmon movements and production 

 (Chadwick 1982; Scarnecchia 1984). Potential 

 studies include mortality rates in the period of 

 transition (July) and the relationship between 

 low temperatures (3°-4°C) and postsmolt migra- 

 tion out of the Gulf of St. Lawrence. Biological 

 data in general are needed to be included in mod- 

 els forecasting salmon runs in the North Atlantic. 



ACKNOWLEDGMENTS 



The authors wish to thank Fisheries and 

 Oceans personnel, including many summer stu- 

 dents, having assisted in field work on the North 

 Shore, particularly S. Cloutier, M. Fortin, M. 

 Laverdiere, Y. Lavergne, B. Legare, B. Mercille, 

 M. Michaud, M. Poirier, and others. J. Boulva 

 believed in the need to study postsmolt biology 

 and actively supported this study. G. Shooner, 

 G. Morin, and team assisted in scale reading and 

 in examining preserved postsmolts in 1982 and 

 1983. J. R. Robitaille assisted in scale data analy- 

 sis. Fishermen between Pointe-des-Monts and 

 Blanc Sablon kindly discussed the incidence of 

 postsmolts in their nets and participated in sam- 

 pling in 1982 and 1983. P. Bertrand of the Minis- 

 tere du Loisir de la chasse et de la Peche (Quebec) 

 shared his knowledge of the bycatch in herring 

 nets. Many thanks also to the population of Bale 

 Trinite. E. M. P. Chadwick, G. Power, and 

 R. L. Saunders kindly reviewed an earlier version 

 of the manuscript. 



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