2002. Region 10. COSEWIC – SC 1987. Ottawa, ON On the taxonomic status of the Yangtze sturgeon, Asian and American green sturgeon based on mitochondrial control region sequences. There are fishing regulations such as size, bag and slot size limits in these states. Houston, J.J.P. For example, Cech et al. DFO trawl fishery catch statistics between 1996 and 2002 recorded green sturgeon at a maximum depth of 610 m (mean=82 m). Status history Fisheries 20(9): 20, 21, 49. 2002) to determine if the species should be listed as an endangered or threatened species under the US Federal Endangered Species Act (EPIC 2001). Fish and Wildlife Service (USFWS). Lindley, and M.L. Seventy-five green sturgeon were caught in one trawl haul at a depth of 78.6 m. The average length and weight of these fish was 119.4 cm (range 94 to 203 cm) and 12.7 kg, respectively (Anonymous 1954). J. Appl. There is a possibility of disease transfer from hatchery -raised sturgeon and wild sturgeon, however there is no evidence that this has ever occurred. Grimes, J. E. Hightower, S.T. Existing protection or other status designations. Clemens W.A. Consequently, green sturgeon have a relatively lower fecundity in comparison to other similar-sized sturgeon species as reproductive energy is more heavily invested in egg size rather than egg number (Van Eenennaam et al. Neither age of maturity nor spawning frequency, however, has been firmly established (Williamson 2003). As no spawning of green sturgeon has been observed in Canada and freshwater utilization is thought to be limited, freshwater impacts may be more generally limited to spawning and rearing habitats in the US. Green Sturgeon Post-doctoral Position UCSC/NOAA. 2003). Their rostrum, or snout, protrudes distinctly outward and upward. Committee on the Status of Endangered Wildlife in Canada (COSEWIC). Sturgeon are easily distinguished from other families of fish by a combination of features including four barbels in front of a subterminal mouth, five rows of bony scutes, a heterocercal tail, an elongate snout, a single fleshy dorsal fin located near the caudal peduncle, and a largely cartilaginous endoskeleton, including an unconstricted notochord that extends into the tail (Figure 1; Helfman et al. Commercial trawl fishing data collected by DFO from 1996 to 2002 recorded green sturgeon bycatch as far north and west as 54° latitude and 131° longitude respectively, which is consistent with the historical range estimations given by Slack and Stace-Smith (1996). 2003). Quite versatile with a bold pure taste, it pairs well with potatoes, sour cream, crème fraiche, soft bread or in the purest Russian tradition, with blinis as well as by itself to fully appreciate its qualities. Consequently, there are different types of Caviar. However, because the DFO data are of such a short time series, and the accuracy and precision of an anecdotal survey are questionable, this claim cannot be made with certainty. 2002). Green sturgeon have few known predators other than humans and some marine mammals (Fitch and Lavenburg 1971; Emmet et al. There was a die off of white sturgeon in the Fraser River in 1993 to 1994. May. March 22 – 23, 2000. Criterion E (Quantitative Analysis) – Not applicable – no data. For example, green sturgeon were historically observed hundreds of kilometres upstream in the Sacramento and Columbia rivers, but are currently restricted in the Columbia River to the lower 60 km downstream of the Bonneville Dam (Moyle 2002). 1994). Green sturgeon eggs are large and dense and likely sink into rock crevices or attach to hard surfaces (Deng et al., 2002; Kynard et al., 2005). The best and largest roe (more than 2.7mm) are selected for this caviar. A 2.5 fold increase in species density was found in the 1993 to 1994 survey and no dramatic changes in species assemblages were determined to have occurred over the 21 years between the studies. http://www.ire.ubc.ca/ecoresearch/ For many gourmets, caviar, dubbed ‘black pearls’, is a food delicacy without parallel. It takes 10 to 14 years to get the best caviar of this species. Species designated at meetings of the full committee are added to the list. Therefore, taking the average age of maturity of 22.5 years and maintaining the estimated 10% mortality value, generation time would be 22.5 + 1/10% = 32.5 years. The types of sturgeon most commonly used in caviar production are Siberian sturgeon, Russian sturgeon, European sturgeon, as well as Sterlet sturgeon. 2003. 2002). Green sturgeon do not seem to have undergone any large-scale range contraction in marine waters as the recent DFO data is consistent with the survey catch data collected by Slack and Stace-Smith (1996). Formerly described as “Indeterminate” from 1994 to 1999 or “ISIBD” (insufficient scientific information on which to base a designation) prior to 1994. COSEWIC status report on the green sturgeon Acipenser medirostris in Canada. The writer would like to thank the following people: Terry Slack for having a passionate interest in sturgeon conservation and providing the only source of historical catches of green sturgeon in Canada; Troy Nelson of the Fraser River Sturgeon Conservation Society for providing information on green sturgeon in the lower Fraser River and providing insight into sturgeon habitat requirements and behaviour; Barry Ackerman, Lia Bijsterveld, Colin Levings, and DFO for providing green sturgeon catch statistics; and Julia Baum for discussions and edits for this assessment. CITES – Appendix II 1997. 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