. The Canadian field-naturalist. 76 The Canadian Field-Naturalist Vol. 98. VENTRAL VIEW SNOUT OF ABOVE SPECIMEN' LATERAL VIEW OFSNOUT OF 1002 :r, TL SPECIHENS Figure 1. Shortnose Sturgeon, Acipenser brevirostrum. Courtesy of D. E. McAllister, National Museum of Natural Sciences. endangered in the United States and is totally pro- tected by the Endangered Species Act of 1973. As a result, no legal exploitation of the species is allowed. International trade in flesh or eggs is regulated under listing of the species on Appendix I of the Convention on International Trade in Endangered Species of W
. The Canadian field-naturalist. 76 The Canadian Field-Naturalist Vol. 98. VENTRAL VIEW SNOUT OF ABOVE SPECIMEN' LATERAL VIEW OFSNOUT OF 1002 :r, TL SPECIHENS Figure 1. Shortnose Sturgeon, Acipenser brevirostrum. Courtesy of D. E. McAllister, National Museum of Natural Sciences. endangered in the United States and is totally pro- tected by the Endangered Species Act of 1973. As a result, no legal exploitation of the species is allowed. International trade in flesh or eggs is regulated under listing of the species on Appendix I of the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES). Population Size and Trend The adult Shortnose Sturgeon population in the Saint John River, New Brunswick, was estimated as 18 000 ± 30percent(Dadswell 1979). Thetotal popu- lation was estimated at approximately 100 000 by extrapolation of the mortality relationship (Dadswell 1979). During the course of a four-year study, over 4000 adults were actually captured. Population sizes in American rivers to the south are lately becoming known and some of them may be as large as the Saint John population. Since the size of Shortnose Sturgeon populations was previously unknown, trends in abundance cannot be accurately determined. For example, the presence of Shortnose Sturgeon in the Saint John River, , the Kennebec River, Maine, and the Altamaha River, Georgia, was unknown until the last two decades, but these appar- ently are three of the larger populations. Also, Ryder (1890) described himself as fortunate when he obtained five Shortnose Sturgeon from the Delaware River and said the species had not been seen since LeSueur's day, but at the same time the Geological Survey of New Jersey (Anonymous 1890) reported a 5:1 ratio of Shortnose to Atlantic Sturgeon and Mee- han (1910) obtained over 100 Shortnose Sturgeon from the Delaware in April 1908 with relative ease. In the last two decades, Shortnose Sturgeon have been captured regularly in the Delaware R
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