In the wild, Spotted Hatchetfish eat insects as their main diet.

The hatchet fish has a diet which is composed primarilly of insects and larvae
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In the wild, Spotted Hatchetfish eat insects as their main diet. In an aquarium environment, they sometimes balk at eating dried floating flakes but over time they will usually accept them as well as floating micro pellets. They should be offered a varied diet that also includes , , mosquito larvae, and frozen or freeze dried bloodworms. Several small portions should be fed over the course of a day.
Dwarf Hatchetfish Diet
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Freshwater hatchetfish are carnivores by nature, feeding on insects and crustaceans in their natural habitat. These fish are particularly well adapted to eating small insects from the surface of the water since their mouths are located on the top of their bodies. In the home aquarium, they should be fed a diet of carnivore flakes, pellets or granules as well as live and frozen foods. Black-Winged Hatchetfish Diet
Photo provided by FlickrPygmy Hatchetfish Diet
Photo provided by FlickrDiet: Hatchetfish are top-feeders who eat insects and their larvae.
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While they are not easily bred within the aquarium environment, Marbled Hatchetfish have been bred in captivity. For any real chance at breeding this species, they will need to be kept in a separate aquarium that is specifically setup for this purpose. A small group of 4 to 6 individuals should be added to a 20 to 30 gallon aquarium filled with aged acidic water pH of 5.5 to 6.5, temperature of 76 to 79 �, plenty of floating vegetation, dim lighting and a thin layer of gravel substrate mixed with peat to help maintain water conditions. The breeding group should be fed a quality diet of live insects and worms like fruit fly and blood worms or other highly nutritious small insects. Successful breeding will produce eggs that will be scattered both in the plant material and on the substrate of the aquarium. The parents need to be removed after successfully breeding as they will consume both the eggs and young fry. The fry will hatch within 36 hours and will become free swimming a day or two later. They should be fed micro foods like infusoria for the first 2 weeks, after which they will be large enough to accept baby brine shrimp or similar fare.Hatchetfish do best with live food such as mosquito larvae or bloodworms, however most will accept flake food. They have no special dietary requirements.Marbled Hatchetfish are an omnivorous species that will consume insect, meaty and vegetable based foods. The bulk of their diet should consist of high quality frozen, freeze-dried or flake commercial foods. They should also be fed live, frozen or freeze-dried blood worms, daphnia or tubifex worms. They can initially be a little reluctant to feed, but in time will become very active feeders that will compete with the most boisterous tank mates for each morsel of food.Even though most hatchet fish in the pet trade are wild-caught, they adapt readily to aquarium fare. In the wild, diet consists mainly of insects and crustaceans. In captivity, hatchet fish enthusiastically eat flake food. Add variety to the diet to ensure your hatchet fish are getting all of the vitamins they need. Treat them with frozen and freeze-dried foods like brine shrimp and bloodworms occasionally to round out nutrition.Breeding techniques: The fish will spawn frequently if fed the proper diet of small flying insects. The water should be peat filtered to darken it and to make the water soft. The fish will spawn after lengthy courtship and the eggs will be laid on floating plants. The eggs will fall to the bottom, at which time the parents should be removed. The fry hatch after 30 hours and will be free swimming after five days. After seven days, the fry can be fed Paramecium and nauplii. The young begin to take adults shape after 20 days, and swim at all tank levels.The lovely hatchetfish or Atlantic silver hatchetfish () is a species of fish in the family. It may exceed 70 millimetres (2.8 in) (SL). It lives in the of all oceans and performs . feeds on a large range of prey items; in the and dominated the diet of small individuals (, , and fish the diet of larger ones. The silvery coloration and bioluminescence of the lovely hatchetfish allows it to hide from predators and prey in the down-welling light of the twilight zone.