Hatchetfish like to jump, and get very spooked at night.

Just an fyi - I was keeping some buckets of water outside and sure enough mosquitoes came and laid eggs in there this summer. This was unintended by me, but very nice as I got FREE live food very often. I would just go to the buckets every 2-4 days and scoop up a bunch of mosquito larvae with a fish net and just dump them in my tank. The hatchets LOVED it! The mosquito larvae also swim up to the surface where the hatchets eat them so all of them were eaten and none hatched

Unknown. Probably breeds in a similar fashion to the marbled hatchetfish, .

Hatchetfish are not exceptionally difficult to care for once acclimated provided their water is kept clean. Aquariums are closed systems, and regardless of size, all need some maintenance. Over time, decomposing organic matter, nitrates, and phosphate build up and water hardness increases due to evaporation. To combat these ever-changing conditions, water should be replaced on a regular basis, especially if the tank is densely stocked. At least 25 to 50% of the tank water should be replaced every other week.

Carnegiella marthae "Marthae Hatchet Fish"

Re: Hatchetfish with ich?02/09/09 Hi Neale,  Hatchet fish deaths in55 gallon 11/14/08 Common hatchetfish are devout carnivores; vegetative matter does not, to any appreciable measure, factor into their natural dietary regimen. Feed protein-rich flakes, brine shrimp, tubifex, bloodworms, or small, floating, carnivore pellets. Obviously, sinking fare will quickly drop out of this fish’s feeding range; no species of hatchet regularly feeds lower than just a few inches below the surface. To that point, I would also like to advise turning off all aeration and filtration during feedings, as water turbulence will cause otherwise floating fare to quickly sink out of the hatchetfish’s reach. Note also that this species is prone to gluttony and overeating in the home aquarium. Swiftly darting toward and gobbling up all surface-floating food items, the common hatchet will typically outcompete all its tankmates for food during feeding time. Compensate for this by dropping a tiny pinch of flakes or worms directly over the hatchet, then placing a normal amount in the rest of the tank; the first, small food drop should keep the hatchetfish busy while the real food drop will accommodate the rest of your fish community. Speaking of which, the common hatchetfish mixes well with virtually all other tropical species. Slight territoriality may occur between multiple common hatchets, but this aggression amounts to little more than bluff and bluster.

Laubuca dadiburjori "Orange Hatchet Fish" Form II

The common name of the hatchet fishes (family Sternoptychidae) comes from their distinctive body form. They are mostly deep-bodied, compressed fishes, which have a sharp "blade" along the lower margin of the body, and a "handle" formed by the posterior half of the body. One of the distinguishing characters of the genus Argyropelecus is the presence of a bony blade in front of the dorsal fin.

Gasteropelecus sternicla "Silver Hatchet Fish"

The Marble Hatchet is a truly amazing and wonderful fish! It adds beautiful color and is by far one of the favorite species of fish I have added to my aquarium. It does well with most any other community fish (when provided with correct water conditions) and only seems to show aggression towards other strictly surface feeders. The only problem I've ever had with it is jumping out of the aquarium (nothing a good lid couldn't handle). So, if you've got a tight lid on your aquarium, give this fish a try. It will provide intrigue to even the most advanced aquarist!Carnegiella marthae prefers a planted aquarium with a few floating plants. A schooling fish, the Marthae Hatchet is best kept in a group of six or more. A hood on the aquarium is necessary, as this fish likes to jump. Excellent water quality must be maintained to keep this fish at its best; they are extremely sensitive to water conditions.