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The Blog Aquatic

News, opinions, photos and facts from Ocean Conservancy

Gulf Killifish: Late to Hatch and Slow to Grow

Posted On May 7, 2013 by

Important questions about the impacts of the BP Deepwater Horizon oil disaster still linger. Some effects could go undetected for years. To fully restore the Gulf, and to make sure the Gulf and its people are recovering, we need to establish a long-term monitoring and research program. While we wait for confidential government studies to become public, little clues are emerging that give us insight into which species were injured and what this might mean for the Gulf ecosystem.

A study reported in Environmental Science and Technology tells us that one species to keep an eye on is the Gulf killifish. Through their ongoing research, the authors (Dubansky et al., 2013) determined that killifish from oil-contaminated marshes in Louisiana were impacted by the disaster. Specifically, they collected eggs from oiled and non-oiled sites before and after the disaster and raised them in a lab. The eggs from oiled sites took longer to hatch than eggs from non-oiled sites. When the late eggs did hatch, the larval fish were smaller and more likely to have heart defects than those from non-oiled sites. This indicates that the developing fish will not be able to survive and reproduce as well as eggs from non-oiled sites.
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