Fishing industry threatens to destabilize stocks.

Researchers' efforts to collect samples at a fair raise ethical questions.

When oil stopped gushing into the Gulf of Mexico, the ecosystems under assault started on a long road to recovery. Amanda Mascarelli meets the researchers assessing their chances.

When oil stopped gushing into the Gulf of Mexico, the ecosystems under assault started on a long road to recovery. Amanda Mascarelli meets the researchers assessing their chances.

Extreme weather wreaks havoc in the rivers.

Extreme weather wreaks havoc in the rivers.

The impact that a newly discovered species makes depends on the completeness of its lineage.

The impact that a newly discovered species makes depends on the completeness of its lineage.

The impact that a newly discovered species makes depends on the completeness of its lineage.

Researchers find that pollutants in Canada's Athabasca River are not from natural sources.

Researchers find that pollutants in Canada's Athabasca River are not from natural sources.

Sediment studies rule out impact as cause of ancient cold spell.

Confounding reports seed confusion over long-term effects of the spill.

Confounding reports seed confusion over long-term effects of the spill.

Antarctic cold snap kills millions of aquatic animals in the Amazon.

Antarctic cold snap kills millions of aquatic animals in the Amazon.

Animals as hidden victims of war are the focus of a groundbreaking initiative.

Genome sequences offer clues on how to be a queen and live a long life.

Genome sequences offer clues on how to be a queen and live a long life.

Genome sequences offer clues on how to be a queen and live a long life.