• Name:

    Least Pencilfish

  • Family: Lebiasinidae
  • Species: Pencil Fish
  • Scientific Name: Nannostomus minimus
More Details

General info about Least Pencilfish

These fish are silver with a dark horizontal band. They only reach up to 0.9 inches. This species isn’t very well known and as such there isn’t much information about it. To keep these fish in captivity, water temperature should range from 71.6° to 82.4°F and water pH should be between 4.0 and 6.5. The tank should be densely planted and should have floating plants. They are peaceful and can be kept in community aquarium with equally small fish, also, they should be kept in groups of at least 10.

Least Pencilfish Diet & Nutrition

This species is omnivorous.  In the wild it feeds on invertebrates and zooplankton. In captivity  it can be fed with dried foods and live or frozen foods.

Determining Sex of Least Pencilfish

Males are more colorful and thinner than females.

Least Pencilfish Origin

This species is native to Guyana, South America.

Acclimating Least Pencilfish

The water in which these fish are packaged is different from the water in the tank, since these fish are extremely sensitive to water conditions the acclimation process is very important. This process should never be rushed. Aquarium lights should be off for at least the first 4 hours of the fish in the new tank and it should not be fed in the first 24h. There are two acclimation methods: Floating Method and the Drip Method.

Floating method -  the aquarium lights should be off and lights in the room should be dim, the bag in which the fish is should be placed in the surface of the water to float for about 15 minutes, this allows the water in the bag to adjust to the water in the tank. The bag should then be cut under the knot and the top edge of the bag should be rolled down one inch, then ¼ cup of the aquarium water should be added to the bag, this step should be repeated every 4 minutes until the bag is full, then half the water of the bag should be discarded and the bag should be put to float again and ¼ cup of the aquarium water should be added to the bag every 4 minutes until the bag is full. Afterwards, the Discus can be moved into the aquarium.

Drip method – the aquarium lights should be off and lights in the room should be dim, the bag in which the fish is should be placed in the surface of the water to float for about 15 minutes, this allows the water in the bag to adjust to the water in the tank. The bag contents should be poured into a 1 gallon bucket that has never been cleaned with any chemicals, the fish should be enterally submerged. A siphon, using airline tubing, should be set up and a drip line should run from the main aquarium to the bucket. Several loose knots should be tied in the airline tubing to regulate flow. Sucking the end of the airline tube that goes to the bucket will begin a siphon, the flow should be regulated to 2 to 4 drips per second. Once the water in the buckets doubles, half should be discarded and the process should be repeated until it doubles again. Afterwards, the fish can be moved to the aquarium.

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Original Detail

Name Species Family Scientific Name More Detail Added by
Least Pencilfish Pencil Fish Lebiasinidae Nannostomus minimus

These fish are silver with a dark horizontal band. They only reach up to 0.9 inches. This species isn’t very well known and as such there isn’t much information about it. To keep these fish in captivity, water temperature should range from 71.6° to 82.4°F and water pH should be between 4.0 and 6.5. The tank should be densely planted and should have floating plants. They are peaceful and can be kept in community aquarium with equally small fish, also, they should be kept in groups of at least 10.

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