snails get freaky

Neritina natalensis is an amphidromous snail. Adults lay eggs in fresh water. The eggs and/or larvae are swept out to sea by river currents. The snails instinctively crawl back upstream after growing a bit in salt water.

I moved the thermometer over to shelter the eggs from hungry fishes after taking the photo. Maybe I'll get all crafty and transfer them to a marine nano-tank, because I don't have enough little projects as it is.*


* Wait. Somalia? Mozambique? This species doesn't belong in an Amazon tank. Now I have to set up another biotope.