Invadopodia

century. A sewage system created by Victorian engineers was a remarkable achievement that began the big clean-up. The now much cleaner river is once again home to many species alongside the seahorse: the young of marine species such as flounder and bass have been discovered in nursery sites up to 20 km inland. But the sewage system that has done so much to restore the river’s cleanliness still faces a problem: during summer storms with their torrential downpours, the system can in some years become overwhelmed with sewage which enters the river. As the storms usually coincide with periods when the river flow is at its lowest, the sewage has a short-term but devastating effect on river species. But the discovery of remarkable new species such as the shortsnouted seahorse should help to bolster efforts to ensure the river is clean all year round.