Bayad

Taxobox
name = Bayad |

status = LC | status_system = IUCN3.1
status_ref = IUCN2006|assessors=Ntakimazi, G|year=2005|downloaded=04 August 2007|id=60740|title=Bagrus bajad]
regnum = Animalia
phylum = Chordata
classis = Actinopterygii
ordo = Siluriformes
familia = Bagridae
genus = "Bagrus"
species = "B. bajad"
binomial = "Bagrus bajad"
binomial_authority = (Forsskål, 1775)
synonyms = The bayad بياض, "Bagrus bajad", is a species of catfish (order Siluriformes) in the family Bagridae.cite journal|url=http://silurus.acnatsci.org/ACSI/library/biblios/2007_Ferraris_Catfish_Checklist.pdf|title=Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types|first=Carl J., Jr.|last=Ferraris|journal=Zootaxa|volume=1418|pages=1–628|year=2007|format=PDF]

Distribution

The bayad is distributed in Lakes Lake Chad, Lake Mobutu, and Lake Turkana and the Nile River, Niger River, and Senegal Rivers. It is found in Benin, Burkina Faso, Cameroon, Chad, Egypt, Ethiopia, Ghana, Kenya, Niger, Nigeria, Senegal, Sudan, and Uganda. Its natural habitats are rivers and freshwater lakes.

Description

The bayad is more or less elongated. The dorsal fin has a smooth spine, and the pectoral fins have spines with serrations on the inside. There are four pairs of barbel anatomy barbels. The maxillary barbels may reach to the ventral fin or pelvic fins. This fish is yellow-greenish or blackish with a white belly. The fins are darker, sometimes reddish purple. Juveniles have little black spots on the sides.FishBase species|genus=Bagrus|species=bajad|year=2007|month=Aug

The bayad has a maximum size of about 112 centimetres (44.1 in) FL. It has a maximum published weight of 12.5 kilograms (27.5 lb), but is reputed to reach 100 kg (220 lb).FishBase species|genus=Bagrus|species=bajad|year=2007|month=Aug] Mean sizes and weight of males are less than those of females from the same age. Males grow up to 7 years old, females 8 years (Ref. 51644).

Ecology

The bayad is found in lakes, swamps and rivers. It avoids salt water. This species spends nearly the whole of the daylight hours in crevices of rocks and is therefore seldom seen. It lives and feeds on or near the bottom. Adults are exclusively piscivorous; it preys on small fish, particularly "Alestes" species, or "Chrysichthys auratus" as in Lake Kainji. These fish are also feeds on insects, crustaceans, mollusks, and vegetable matter. The efficiency of catching prey catfish is maximised by face to face attack, avoiding damage by dorsal and pectoral spines of the prey.

There is some indication that the species comes to shallower water to breed. Spawning season extends from April to July. The parents build and guard the nest, which is like a flat disc with a central hole where the eggs are dropped; the size of the nest and the central hole depend on the fish size.

Relationship to humans

The bayad is an important food fish. The bayad flesh is good eating and is of economic importance, commonly sold as food.

References

* [http://www.planetcatfish.com/catelog/species.php?species_id=1110 Images and details at Planetcatfish] .