Daphnia: Water Purifiers
These tiny crustaceans keep water clear by filtering out algae and microbes, perfect for Martian aquaponic systems. A single Daphnia can clean 100mL of algae-laden water daily. Their reproduction doesn’t require males, allowing rapid population growth from just a few founders. Space station studies confirm they tolerate reduced gravity, though breeding rates decrease slightly. Their biggest challenge? Designing bioreactors that maintain optimal algae levels for their diet.