51813_Sturgeon biodioversity an.PDF

Figure 1.Past and present distribution of North American paddlefish,Polyodon spathulaand locations of sport fisheries (adapted f ...

Figure 2. Status of North American paddlefish stocks in the United States. AL. Alabama; AR, Arkansas; IA. Iowa; IL. Illinois; IN ...

cated negative changes in status since 1983 (Table 1). Significant positive changes were reported in Io- wa, which changed statu ...

was implemented in 1989. Paddlefish in the Tennes- see River are considered to be ‘very reduced in numbers’. Overharvest and hab ...

protection for females. The statewide commercial harvest during 1993 was estimated to be 136000– 181000 kg. Most sport fisheries ...

believed to be problems. In 1989, the Montana legis- lature passed an act which established a procedure for legally collecting a ...

season. During 1993–1994,2268–2726 kg of paddlef- Pennsylvania (no sport or commercialfisheries, ish eggs were collected for cav ...

state are closed to commercial fishing except those designated as open. Commercial harvests are also controlled by various gear ...

SinceGengerke’s(1986)report,fivestates (Ala- bama,Iowa, Louisiana, Oklahoma, and Virginia) haveprohibitedcommercial harvest of p ...

in the United States. pp. 22–35.In:J.G. Dillard, L.K. Graham & T.R. Russell (ed.) The Paddlefish: Status, Management and Pro ...

Right side portrait of Scaphirhynchus platorynchus 98 cm TL from the Missouri River downstream of Great Falls, Fort Benton, Mont ...

EnvironmentalBiology of Fishes48:291–298,1997. © 1997 KluwerAcademicPublishers. Printed inthe Netherlands. Life history and stat ...

with aquestionnairesent to all 24 stateswithin the range ofthisspecies; biology andlifehistory infor- mation were obtained from ...

their ages varied by as much as 19 years (Zweiacker 1967). The shovelnose sturgeon is the smallest of the North American sturgeo ...

do not mature until age 7 (Helms 1973). In areas of poor food supply. males and females become sex- ually mature at a smaller si ...

er (1983) indicated that floating nets can be used by fishermen to catch sturgeon at that time. The fish are also vulnerable to ...

exceeds the supply, fish are often sold as smoked sturgeon. Shovelnose sturgeon are also harvested in late fall and early winter ...

Held, J.W. 1969. Some early summer foods of the shovelnose sturgeon in the Missouri River. Trans. Amer. Fish. Soc. 98: 514–517. ...

Williams, J.D. & G.H. Clemmer. 1991.Scaphirhynchussuttkusi,a new sturgeon (Pisces: Acipenseridae) from the Mobile Basin of A ...

Environmental Biology of Fishes48:299–309,1997, © 1997KluwerAcademicPublishers. Printedinthe Netherlands. The status and distrib ...