Mosquito Minnows! Enjoy little Mosquito Minnows. We have both Rosie Minnows and Gambusia Minnows. Mostly Gambusia. Both Can be grown in small tanks outdoors or large ponds and multiply readily. They like to hide and sometimes spawn in submerged or emergent plants where they find protection. Every pond should have these or small pools. One portion will contain 12-16 fish so you will be fairly certain to get females and males. Most of the cost of the first portion is the 2 day shipping with the foil bag in summer and the ice. If you buy larger portions there is a small discount.