The trout goodeid is scientifically known as Ilyodon furcidens.

This freshwater fish has a torpedo-shaped body that resembles a small trout, which is how it got its common name. They typically grow to 3–5 inches (7–12 cm). Their coloring is olive to golden-brown with iridescent blues and a row of orange or reddish spots along the sides. Males are usually more colorful and slightly smaller than females.

Native to central Mexico, trout goodeids belong to the Goodeidae family — a unique group of livebearing fish.

Care Instructions

Tank Size

• Minimum 20 gallons for a small group

• Best kept in groups of 4–6

• Active swimmers — appreciate open space

Water Parameters

• Temperature: 65–75°F (18–24°C)

• pH: 7.0–8.2

• Prefer moderately hard to hard water

• Stronger filtration is fine (they like well-oxygenated water)

They enjoy cooler, clean water compared to many tropical fish.

Tank Setup

• Mix of open swimming areas and plants

• Rocks and driftwood for structure

• Good water movement

• Secure lid (can jump)
  
  

What Do Trout Goodeids Eat?

Trout goodeids are omnivores with a strong herbivorous tendency.

Staple Diet

• High-quality pellets

• Spirulina-based flakes

Fresh/Vegetable Foods

• Blanched zucchini

• Spinach

• Peas (shelled)

Protein Treats

• Bloodworms

• Brine shrimp

• Daphnia

Feed once or twice daily, avoiding overfeeding.

Fun Facts

• They give birth to live young that are connected to the mother by trophotaeniae (a cord-like structure for nutrient transfer).

• They prefer cooler water compared to most common aquarium livebearers.

• They can show strong personalities and may establish mild dominance hierarchies.

• Their metallic sheen becomes more vibrant with proper diet and cool water.