. Earth tones-- : the book : federal science for sustainable development . Biodiversity Low sea survival threatens salmon Department of Fisheries and Oceans Atlantic salmon leaving Nova Scotia rivers for the Bay of Fundy and the Gulf of St. Lawrence to winter at sea for the first time are failing to return to their natal rivers. Something is killing the smolts at sea. Although the usual suspects—fisheries, predators, food shortages —have been examined, no clear culprit in the stocks' decline has been identified. Scientists at the Department of Fisheries and Oceans examined levels of freshwater
. Earth tones-- : the book : federal science for sustainable development . Biodiversity Low sea survival threatens salmon Department of Fisheries and Oceans Atlantic salmon leaving Nova Scotia rivers for the Bay of Fundy and the Gulf of St. Lawrence to winter at sea for the first time are failing to return to their natal rivers. Something is killing the smolts at sea. Although the usual suspects—fisheries, predators, food shortages —have been examined, no clear culprit in the stocks' decline has been identified. Scientists at the Department of Fisheries and Oceans examined levels of freshwater production, legal and illegal fisheries, predation, forage availability, marine environmental conditions, disease, parasites and factors such as delayed maturation. No single factor was identified to explain the low sea survival. However, there are indications that the ecosystem of the Northwest Atlantic has changed since the late 1980s, and may be a factor in the low return rates of salmon. For instance, below-normal water temperatures, large-scale changes in the distribution and abundance of Atlantic herring, Arctic cod, Greenland halibut and snow crab, and changing diets of seabirds such as Funk Island gannets, have an impact on the marine ecosystem. .)
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