White croaker

White croaker ( Genyonemus lineatus )

The white croaker ( Genyonemus lineatus ) (English: White Croaker or Spanish: Roncador blanco ) is a croaker of the North American west coast. It was originally described in 1855 by William Orville Ayres as Leiostomus lineatus, but later found in a separate class with the name Genyonemus. The word Genyonemus could be translated as " chin thread " - even though the White Umber has no Bartel. However, it is now clear that " Genyonemus " a clerical error in the manuscript, or ( more likely ) is a read error of a typesetter: for Genyanemus ( " chin without thread " ). If you want to be subtle, but could pass the name as haplology of " Genyonenemus " explain ( what would be called " chin without Bartel ").

Features

The conformation of the White Umbers is flattened elongated and slightly to the side. The head is obtuse rounded, the mouth is slightly inferior, as with most fish, that feed mainly on the ground. Its color is pale brownish to yellowish, against the back to silvery. The fins are yellow to white. The white croaker is in size (up to just over 40 cm) and way of life quite similar to the eyespot - Umber ( Leiostomus xanthurus ). He has no eye-spot, but at the pectoral fin base sometimes a dark-colored, small "spoiler " ( Axillarschuppe ).

The white croaker is like the eye-spot - Umber monotypic, that is the only type of its kind. He has 25 vertebrae.

Fin rays: XII- XV D1, D2 I/20-23, A II/10-12.

By 12-15 fin rays of the first dorsal fin of the white croaker from all other Umberfischen with inferior mouth is different, since they have no more than 11 fin rays. He does not have a fleshy appendage ( Bartel ) on the tip of the chin as Menticirrhus undulatus from the related genus, the king fish and Umbrina Roncador from the genus Umbrina that occur in the same distribution area.

Habitat

Its occurrence extends along the west coast of the North American continent between Baja California and the Barkley Sound in British Columbia, but its frequency is north of San Francisco rapidly decreasing.

The white croaker is on the west coast of the vicarious nature of the related Eyespot Umbers of the North American east coast, ie it represents him geographically, but has similar ecological requirements such as this. He swims over sandy bottoms and feeds on bristle worms, small shrimp, crabs and molluscs.

He is also a much -caught and commercial fish tasty, but insignificant for sport fishers as the eyespot - umber - to use most as bait.