October 28, 2023 — The following was released by NOAA Fisheries:
Atlantic sturgeon inhabit rivers and coastal waters from Canada to Florida and can live for 30-60 years. The sturgeon family is the most primitive of all bony fish, with ancestors dating back to the Cretaceous period more than 120 million years ago. Atlantic sturgeon are particularly sensitive to high water temperatures, especially their eggs and juveniles. This sensitivity makes them vulnerable to warming water temperatures associated with climate change.
Beginning in the late 1800s, commercial fisheries began to harvest valuable caviar from Atlantic sturgeon. By the early 1900s, their populations had declined drastically. Recovering Atlantic sturgeon is challenged by their long generational cycles and late age of sexual maturity for reproduction. In response to historic and current challenges, NOAA Fisheries listed four distinct population segments of Atlantic sturgeon as endangered and one as threatened under the Endangered Species Act in 2012.
In 2023, NOAA Fisheries celebrates the 50th anniversary of the Endangered Species Act. Since it was enacted, no listed marine or anadromous species have gone extinct. However, as climate change intensifies, the recovery of listed species, like the Atlantic sturgeon and its relatives, may become more challenging. Through climate-focused research and management, NOAA Fisheries aims to mitigate the potential impacts of climate change on listed species to foster their continued recovery.
Impacts of Warming Water Temperatures
Atlantic sturgeon migrate from freshwater rivers and estuaries to the ocean as sub-adults, then return to spawn in the same rivers where they were born. Spring spawning adults move inland when temperatures warm and days are longer. Fall spawning adults move upriver in the heat of the summer to spawn as water temperatures cool in the fall. Due to climate change, the rivers and bays of the U.S. East Coast are warming earlier in the spring, and experiencing hotter peaks during the summer.
Juvenile Atlantic sturgeon prefer water temperatures between 65–72°F to develop, and they will be healthiest during years with that temperature range. Inland waters that warm faster and stay warm for longer due to climate change may limit successful spawning and threaten the survival of eggs and juveniles.