Fresh water aquarium fish are classified into two groups: livebearers and egg-layers. Livebearers give birth to their young instead of laying eggs. Female Egg-layers discharges eggs when impregnated by the male fish.
All Fresh water aquarium fish are very colorful and attractive so how can you tell if one is a livebearer or an egg layer?
Swordtails (Livebearers)
The male has long tail like sword. Therefore, the fish is called the swordtail fish. Swordtail may grow upward to 5 inches. Generally, they are peaceful but the male is known for chasing after other male. To protect the young ones the female must be tooking out because the females are well known for eating up their young.
Guppies (Livebearers)
The male guppies are fancy and colorful, whereas the females are dull and plain. This fish breeds well however overcrowding can become a problem in the aquarium.
Mollies (Livebearers)
Prefers a little salt in their water. They comes in many distinct colors such as orange, green and black. One of the Molly's biggest problem is stopping them from breeding. The females are generally larger and broader. When pregnant, the females have a dark gravid spot near her anal fin. Mollies will eat up their young, so it's crucial to either have a big plant or a separate breeding tank.
Pearl Gourami (Egg-Layers)
Pearl Gourami are typically quite easy to feed. They like eating live foods such as black worms, brine shrimp, and glass worms. Supply plenty of floating plants and bring the water temperature to close to 80 degrees. The males build a bubble nest, after which breeding will happen. When spawning the male wraps his body around the female who then releases hundreds of eggs. After the eggs have been laid remove the female. Four days later the small fry will be free swimming and the male should be removed.
Angelfish (Egg-Layers)
Besides their graceful beauty, Angelfish are one of the most popular selections of tropical fish due to their lustiness and simplicity of keeping. Angels cannot merely be placed collectively together as a pair in a tank and be expected to breed. Angelfish prefer to choose their own mates and pair up. Angelfish mating or spawning starts with the pair selecting a flat surface in the tank to lay the eggs.
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