http://www.newsweek.com/seal-attacks-algal-bloom-neurotoxin-south-africa-1774359

A spate of attacks by seals around Cape Town in South Africa may be due to the marine mammals having been poisoned by domoic acid.

The domoic acid, a toxin released during a red tide algal bloom, may have made its way into the seal's system if they fed in the bloom's vicinity and caused swelling in their brains and hearts, leading to increased aggression, Brett Glasby, wildlife management program coordinator at Two Oceans Aquarium, told local outlet News24.