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Wild caught guppy, these were caught in the rivers of Puerto Rico. The ones shown are males, though a few females are also there. They breed each week, with a weekly spawn of 10 fry.
Slow flowing rivers covered by trees. There are no aquatic plants in the river and it has a sandy bottom. The grayish color helps them blend with the rocks, although the movements they do to evade somenone gives them away. They school in around 30+ groups with swordtails. Small fry stay together near the shallow regions of the river.
The bottom fish in the fourth photo is a female green swordtail.