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Others
/ Ariidae / Shark Catfish
Shark Catfish, Colombian Shark Catfish
Arius seemani | Pictures
Synonyms: Arius
jordani, Hexanematichthys seemani, Tachisurus seemani
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Physical description: The body is elongated and silver in color and the belly is white.
The fins are black and white-tipped.
The
head is broad, with a large mouth.
The eyes are large and protrude from the head.
The Shark Catfish possesses three pairs
of barbels; one on the upper jaw and two on the lower.
The color contrasts fade with age.
Size/Length: To 24" (60 cm) in nature, although rarely larger than 15" (38 cm) in captivity.
Similar species: Other Arius
species
H: North, Central, and South America; estuaries of tidal rivers and lagoons from Southern
California to Peru on the Pacific Coast
A: bottom, middle
Aquarium: A 40" (102 cm) or 45-55 gallons (170-209 L) is sufficient for young individuals.
Adults
need a tank of at least 64" (163 cm) or 100-125 gallons (378-472 L). The tank should be well lighted, maybe
in a position to receive morning sun.
A strong filter is necessary for a powerful current and a good turn-over
rate.
Provide many caves and hiding places.
Water chemistry: pH 6.8-8 (7.6), 8-30 dH (16), 72-81°F (22-27°C).
A 2% addition of salt is necessary.
This
can be accomplished by adding 15 TSP. of salt/ 10 gallons (20 g of salt/10 L).
Social behavior: Combine only with larger, sturdy fish who live in brackish water. These fish are capable
of swallowing fish up to 67% of their length. Keep in groups of four or more individuals.
Social behavior: Adults can be combined with marine species; young can be combined with
Anableps, Monodactylus, Scatophagus
, Tetraodon
, and Toxotes
species.
FOOD: Live; fish, crustaceans, insect larvae; tablets.
This species prefers food in chunks.
Has huge appetite and may attack other tank mates if not fed sufficiently.
Suggested companions: Females plumper when over 12" (30 cm).
Breeding techniques: Unsuccessful in captivity because of the area needed.
Spawning has been observed in nature.
It
takes places in freshwater and brackish estuaries. Up to 100 marble-sized eggs are mouth-brooded by the male.
Breeding potential: 10.
Breeding has not been accomplished in aquaria.
Remarks: A very active fish. Can only be kept in fresh or brackish water while juveniles. With
age more salt must be added to the water.
Adults require sea water or brackish water.
Some populations of this fish migrate
south from California during the colder parts of the year.
By rotating its pectoral fin in its socket, adult
fish can make a loud, croaking sound.
This sound is amplified by the swim bladder.
Difficulty of care: 4 (while young).
Young fish are extremely hardy, but
aggressive and require live foods.
7
(adult).
Adults need to be kept in salt water, and are highly aggressive towards
smaller fish.
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.
How to save the world's oceans from overfishing
(7/8/2007) Global fishing stocks are in trouble. After expanding from 18 millions tons in 1950 to around 94 million tons in 2000, annual world fish catch has leveled off and may even be declining. Scientists estimate that the number of large predatory fish in the oceans has fallen by 90 percent since the 1950s, while about one-quarter of the world's fisheries are overexploited, depleted, or recovering from depletion. Despite these dire trends, the situation is changing. Today some of the world's largest environmental groups are focused on addressing the health of marine life and oceans, while sustainable fisheries management is at the top of the agenda for intergovenmental bodies. At the forefront of these efforts is Mike Sutton, director of the Monterey Bay Aquarium's conservation program: the Center for the Future of the Oceans. The aquarium, which has long been recognized as one of the world's most important marine research facilities, is pioneering new strategies for protecting the planet's oceans. Sutton says the approach has four parts: establishing new marine protected areas, pushing for ocean policy reform, promoting sustainable seafood, and protecting wildlife and marine ecosystems.
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