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Time of hatching, abundance of recently-hatched larvae and their relative contribution from the Georges Bank and Nantucket Shoals spawning grounds, as well as mortality during the autumn-winter period are esti mated for eight spawning seasons on the basis of data from the ICNAF Larval Herring Surveys which were conducted during 1971-78. Indices show that the highest initial larval production occurred in 1973 and 1974 as a result of the large 1970 year-class and that there was a decline in production of about two orders of magnitude by 1976 and thereafter. The collapse of the fishery on Georges Bank in 1976 coincided with a deiay in peak spawning from midto late-October, a contraction of the spawning season, and a shift of the remaining spawning population to northwestern Georges Bank and Nantucket Shoals. Furthermore, the mean seasonal mortality rate of 5% per day, estimated over the first 6 months of life, varied significantly (3-7%/day) after the 1975 season. The initial larval production estimates are compared with abundance indices (age 3+ herring) from spring bottom-trawl surveys, and sources of bias are evaluated.

journal/e-journal of northwest atlantic fishery science/journal of northwest atlantic fishery science/journal of northwest fishery science

Larval Abundance and Mortality of Atlantic Herring (<i>Clupea harengus L.</i>) Spawned in the Georges Bank and Nantucket Shoals Areas, 1971-78 Seasons, in Relation to Spawning Stock Size

Larval Abundance and Mortality of Atlantic Herring (Clupea harengus L.) Spawned in the Georges Bank and Nantucket Shoals Areas, 1971-78 Seasons, in Relation to Spawning Stock Size