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Year class strength estimates of alewife, blueback herring and American shad were compared to landings and catch-per-effort estimates of the parents in the major freshwater nursery zone of the James, York, Rappahannock and Potomac rivers of Chesapeake Bay. There was no direct parent-progeny relationship for any species in any river, although adult landings of shad (females) below 150,000 pounds per season usually coincided with weak year classes. The James River was the most productive for young alosines over the period of record. The density of juveniles in the James River exceeded the other rivers by 15 to 70 times depending on year and species .. The Potomac, with far less densit~ produce~ more young alosid~ than in the more productive York and Rappahannock because of its large nursery zone. Over the last five years the total estimated number of juvenile alosids present in early fall ranged between 73 and 1969 million for all rivers.

Biology And Management Of River Herring And Shad In Virginia : Annual Report, Anadromous Fish Project 1974