LOS ANGELES – A year after the grand reopening of the newly restored Malibu Lagoon, a third endangered species missing for decades was spotted. An adult steelhead trout, approximately 20 inches in length, was discovered on May 15 during post-construction fish monitoring by the Resource Conservation District-Santa Monica Mountains, California State Parks and The Bay Foundation.
No steelhead trout have been reported in the Malibu Lagoon for decades, although their presence in the creek upstream is known.
“We are thrilled to see an adult steelhead in the newly restored lagoon. Its presence shows that the conditions onsite are now vastly better,” said Suzanne Goode, senior environmental scientist for California State Parks.
This marks the third discovery of expanded activity by an endangered species since the completion of the Malibu Lagoon Restoration Project. In summer 2013, the California least tern produced seven nests with eggs, which had not occurred in over 70 years. Federally listed tidewater gobies have also expanded their presence into the restored area taking advantage of almost two additional acres of suitable burrow habitat.
Steelhead trout are known for needing clean, cool, well-oxygenated water, all of which were goals of the Malibu Lagoon Restoration and Enhancement Project. In addition to steelhead trout, tens of thousands of native fish were documented during the fish survey. The plan is to place a camera (underwater ultrasound) in early June to record the fish as well.
Prior to the restoration, the Malibu Lagoon—on the U.S. Environmental Protection Agency list of impaired water bodies for over a decade due to excess nutrients and low oxygen levels—was filled with contaminated soil and trash built up over many decades, including fill dumped from past road construction work. The resulting choke points impeded regular tidal flow in and out of the lagoon, causing little “flushing” of the lagoon channels. This created a build-up of nutrients and fine sediments (mud) in the lagoon, which in turn caused low oxygen levels in the water. Without oxygen, aquatic life cannot breathe, so very little was able to grow in the lagoon.