The fish aren't quite mature enough to tell for sure, and the angle directly above for the two fish. The only one I'm pretty sure is female is 3. Warm them up and feed them and give them a chance to mature and they'll let you know easily ;).
Like Barbie said, Fish 3 is probably female, looks plump behind the pectoral fins. The others are probably male based on the streamlined body and hairy pectoral fins.
Breeding List: L46,L66,L129,L136a,L183,L201,L260,L270,L333,L340,L400,L411, and Lower Rio Xingus