Physical description: An elongated, slender fish with a long snout and mouth. The body color is silver while the fins are transparent. The tail is forked and has a black spot at its base. The upper jaw is slightly longer than the lower. This fish may have golden to blue iridescence depending on lighting. Size/Length: To 28" (70 cm), not usually larger than 10" (25 cm) in captivity. Similar species: There are three sub-species of C. hujeta: C. hujeta beani, C. hujeta insculptus, and C. hujeta hujeta. Habitat: South and Central AmericA: Rio Magdalena, Columbia; also found in Panama and Venezuela. In nature, this fish can be found in large groups hunting prey. S: middle, top Aquarium: 60" (152 cm) or 90 gallons (342 L). The tank should have a tight-fitting lid and a cover of floating plants. Leave large, open swimming areas and use a filter that provides a moderate to strong current. The tank should be well-planted along the sides and in the back. Provide some driftwood structures for hiding. Water chemistry: pH 6.5-7.5 (7.0), 5-20 dH (10), 73-81°F (23-27°C) Social behavior: A predator that can only be combined with other large fish of the lower swimming levels. Keep in pairs or in groups. Suggested companions: Piranhas (and allies), Anostomus, Central and South America cichlids, Pimelodids, Loricarids. FOOD: Live; fish, earthworms, large insects; pellets; large flakes SEX: Females are slightly larger than males, and during the spawning season, they have a fuller stomach. The edge of the male's anal fin appears frayed, while the female's fin is straight. Breeding techniques: Use water with a temperature between 77-82°F (25-28°C). After an active courtship, the eggs are sprayed out above water surface, sinking and adhering to plants and rocks. Spawning takes up to three hours and a large female can produce 3000 eggs, although 1000-1500 eggs is a more reasonable amount. Eggs hatch in 1-2 days and fry are free-swimming after 4-5 days. Start feeding small live foods such as Brine Shrimp nauplii, Cyclops nauplii, and roftiers. After a week, the young can be fed larger foods, such as the fry of livebearers. The young must be fed several times a day to prevent cannibalism. Frequent partial water changes are necessary for the health of the young. Breeding potential: 8. Breeding C. hujeta hujeta is a challenge. Remarks: Hunts at night and during the day. This fish is skittish and timid. If frightened it may swim frantically around the tank, crashing into the glass and throwing itself against the lid, causing injury and even death. Avoid making sudden movement when performing water changes and loud noises. Sensitive to the addition of new water during water changes. Difficulty of care: 6. This large, nervous fish is an active predator which must be fed live foods. Under the right conditions this fish is hardy. Recent articles about fish Overfishing may hurt Amazon forest trees (2/5/2008) Overfishing is reducing the effectiveness of seed dispersal by fish in the Brazilian Pantanal, reports Nature. The research suggests that fishing practices can affect forest health. Scientists find fish that literally lives in trees (10/17/2007) Scientists have found a fish that literally lives in trees, according to research published in The American Naturalist and highlighted in New Scientist Magazine. Piranhas originated when Amazon was flooded by seawater (12/4/2007) South America's piranha family of fish -- notorious as eaters of flesh -- can be traced back to a single ancestor which dispersed when the Amazon was flooded by seawater some five million years ago, report researchers from the Institut de Recherche Pour le Developpement (IRD). Today piranhas are exclusively freshwater fish found from the Orinoco River basin in Venezuela to the Parana in Argentina. |
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Copyright Rhett Butler 1994-2009 The copy for fish.mongabay.com was written in 1994-1995. Therefore some information such as scientific names may be out of date. For this, I apologize. Feel free to send corrections to me. |
