Silurus biwaensis
| Giant Lake Biwa catfish | |
|---|---|
 | |
| Giant Lake Biwa Catfish | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| (unranked): | Fish |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Siluridae |
| Genus: | Silurus |
| Species: | S.biwaensis |
| Binomial name | |
| Silurus biwaensis Tomoda, 1961 | |
The giant Lake Biwa catfish (Silurus biwaensis) or Biwako-o'namazu, ビワコオオナマズ (Japan) is the largest predatory catfish species endemic to Lake Biwa in Japan.
Description
The giant Lake Biwa catfish is very similar to wels catfish, which it is closely related to. It has an elongated cylindrical body and can reach up to 1.18 m (3 ft 10 in) in length and weigh as much as 17 kg (37 lb).[1] The top of the body is dark grey to black in colour while the underside is a pale, whitish colour. On rare occasions, the giant Lake Biwa catfish can reach lengths of up to 2.4 m (7 ft 10 in) long, and weigh over 140 kg (310 lb).
Lifecycle
They prey on fish and frogs which live in the lake. S. biwaensis is the largest predatory fish in Lake Biwa.[2] Using telemetry methods researchers tried to explain the migratory behavior of the species. It was found that the fish are more or less site-faithful and mostly stay close to their spawning grounds.[3] Other studies have shown that the sub-populations of the lake hardly mix.[4]
Relationship to humans
Some fishermen believe that the catfish change their behavior and become very active when an earthquake is imminent.[5] In Japanese mythology, a giant catfish named Namazu causes earthquakes as he moves below the earth's surface.[6]
Related species
References
- ↑ Froese, Rainer and Pauly, Daniel, eds. (2013). "Silurus biwaensis" in FishBase. April 2013 version.
- ↑ "Lake Biwa Facts". Lake Biwa Museum. Retrieved 4 March 2013.
- ↑ Takai, N.; Sakamoto, W.; Maehata, M.; Arai, N.; Kitagawa, T.; Mitsunaga, Y. (1997). "Settlement characteristics and habitats use of Lake Biwa catfish Silurus biwaensis measured by ultrasonic telemetry". Fisheries Science 63 (2): 181–187. ISSN 0919-9268. Retrieved 4 March 2013.
- ↑ Takai, Noriyuki; Sakamoto, Wataru (1 August 1999). "Identification of local populations of Lake Biwa catfish in Japan on the basis of δ13C and δ15N analyses". Canadian Journal of Zoology 77 (2): 258–266. doi:10.1139/z98-210. Retrieved 4 March 2013.
- ↑ The Best Earthquake Predictor is a Catfish.
- ↑ Ashkenazi, Michael (2003). Handbook of Japanese Mythology. Santa Barbara (Calif.): ABC-CLIO. p. 220. ISBN 1576074676.