A new study on the effects of the 1989 Exxon Valdez oil spill in Alaska shows that embryonic salmon and herring exposed to very low levels of crude oil can develop hidden heart defects that compromise their later survival, indicating that the spill may have had much greater impacts on spawning fish than previously recognized. (sciencedaily.com)
Guests can see the sharks feeding on plankton and other spawning fish during the full moon of March — June. (chabilmarvillas.com)
At the same time, they may also have other impacts on the food web that have yet to be measured, including possibly competing with typical winter - spawning fishes for food. (sciencedaily.com)