51813_Sturgeon biodioversity an.PDF

Figure 1.Lifehistory ofA. sturioin the Gironde Estuarysystem.Majorpoints in thelifehistory arenumbered.ModifiedfromAnony- mous(1 ...

taggingexperiments inorder toassess (using the Jolly-Sebermethod) thesize of thestockwhich en- ters the GirondeEstuary in summer ...

Figure 2.Map of the distribution ofcaptures ofA. sturioin the easternAtlantic andNorth Sea. emission from males. In the other ca ...

Rearing of larvae Larvae were fed mainly with live nauplii ofArtemia salinaand other zooplankton or frozen natural Cood (chirono ...

tol Channel andNorth Sea(Castelnaud et al.1991). It inhabitsshallowlittoralareas,with 83% ofcatch- es occurringbetween 10 and 70 ...

Table 1.Results of attempts tospawnwildcaughtfemales ofAcipensersturio(1981–1994). I981 1983 1984 The only female ovulated, but ...

as occurred in1985. In thecase ofimmaturefish, it mate age of 3weeks.Some hadstarted to feed, but was difficult orimpossible tob ...

(unimodal populationstructure,decline in occa- sionalmarinecatches, increasedgrowthrates, and non-motile sperm) aresymptoms of t ...

Acknowledgements bu IsraelProgram forScientificTranslations.Jerusalem. 505 Billard, R. & C. Gillet.1984.Influence dequelques ...

Cryopresarvation of the sperm of Sakhalin sturgeon(Acipen- AcipensersturioLinnaeus, 1758 (Acipenseridae).Env. Biol. ser medioros ...

et en Garonne(duBecd’Ambes àCassueil).Rapportprélimi- naireCTGREF, DivisionA.L.A.,Bordeaux. 12 pp. Trouvery, M., P. Williot & ...

Part 3: Controversies, conservation and summary Acipenser brevirostrumfemale 58 cm long from the Hudson River near Kingston, New ...

Sturgeonlanding on theVolgaRiver. From anengraving inMoynet^1. p. 85. (^1) Moynet, M.1867. LaVolga. LeTour duMonde 15:81–96. ...

Environmental Biology of Fishes 48:373–380,1997. © 1997 Kluwer Academic Publishers. Printed in the Netherlands. Sturgeons and th ...

Figure 1.Map of the Aral Sea area. Twoshorelines are shown:1960 and1989.Locations of catches of the large Amu-Dar shovelnose stu ...

lowerreachestheseseasonal variations areless pro- nounced because so much water isremoved byirri- gation channels and reservoirs ...

el had decreased by16.4 in by the end of 1993.Water volumedecreasedmorethanthreetimes. and now it is lessthan 300 km^3. The size ...

not found in thelowerreaches of theriverduring prise30.5% of thefood.Fishes arerepresented by the 1980s. C. kuschakewitschiand s ...

ter sturgeon die rapidly. I assume that in the low- waterperiodfrom themiddle1970suntil thelate 1980s, thedecrease in theflow ve ...

on the manuscript and toWilliam E .Bemis for drawing themap. cies (including stellate sturgeon, Acipenser stellatus, and Russian ...