Fish kill dead zones in the gulf are mainly created by the nitrogen and phosphorus enrichment of the Lower Mississippi River. Some species of fish exhibit mass simultaneous mortality as part of their natural life cycle. Fish kill due to spawning fatalities can occur when fish are exhausted from spawning activities such as courtship, nest building, and the release of eggs or milt (sperm). Fish are generally weaker after spawning and are less resilient than usual to smaller changes in the environment. Examples include the Atlantic salmon and the Sockeye salmon where many of the females routinely die immediately after spawning. A
Sockeye Fire By the morning of Monday, June 15, the fire had grown to over , and had destroyed 40–45 structures, roughly half of which were primary homes occupied by local residents, with the other half being described as "secondary structures". Local schools and churches were used as emergency shelters. In addition to Willow, air quality has been affected in the communities of Nancy Lake, Houston, and Big Lake. The Sockeye Fire has impacted the sled dog teams living in the area, with as many as 4,500 dogs moved away from the impacted areas. Other sled dogs, owned by local participants of