White sturgeon

Description

White sturgeon (Acipenser transmontanus) is a species of sturgeon in the family Acipenseridae of the order Acipenseriformes. They are an anadromous fish species ranging in the Eastern Pacific; from the Gulf of Alaska to Monterey, California. However, some are landlocked in the Columbia River Drainage, Montana, and Lake Shasta in California, with reported sightings in northern Baja California, Mexico. A. transmontanus is distinguished by the two rows of four to eight ganoid bony plates between the anus and anal fin, with about 45 rays present in the dorsal fin. Coloring can range from gray to brownish on the dorsal side, paler on the ventral side, and gray fins. Barbels are situated anterior to the mouth, closer to the snout than the mouth. At sexual maturity, A. transmontanus can reach 1.6 m (5.2 ft) in length, while the maximum length recorded of any age class is 6.1 m (20 ft), with common lengths around 2.1 m (6.9 ft). While age at maturity is uncertain, possible age ranges of known A. transmontanus specimens range from 11-34 years old. The maximum published weight known was 816 kg (1,799 lb) with a reported age of 104 years. White sturgeon are native to several large North American rivers that drain to the Pacific Ocean. They primarily live in estuaries of large rivers, but migrate to spawn in freshwater, and travel long distances between river systems. Reproducing populations have been documented along the West Coast, from northern Mexico up to the Aleutian Islands in Alaska. White sturgeon are commonly found in deep, soft bottomed areas of estuaries, where movements in the water column is dependent on salinity. Historical ranges have been modified substantially by overharvesting, habitat changes due to dams, and river regulations; all affecting habitat quality, suitability and connectivity. In the lower Fraser River, British Columbia, movement and abundance are assessed by acoustic tags and mark recapture methods. While the model developed by Robichaud, English and Nelson assumes a closed homogenous population, acoustic tags and mark-recapture data shows that they are sedentary during the winter months and mobile in the spring and fall, with data indicating that they leave the Fraser River and enter the Strait of Georgia during their mobile periods; this conclusion has been validated by microchemical evidence of marine exposure in Fraser River white sturgeon fin rays.