This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Babushkin, N.Y.A. & Borzenko, M.P. (1952). Sturgeon of the Caspian. Pishchepromizdat Moscow: 5–67. (In Russian).BabushkinN.Y.A.BorzenkoM.P.1952Sturgeon of the CaspianPishchepromizdat Moscow567(In Russian).Search in Google Scholar
Bakhshalizadeh, S., Zykov, L.A., Nasibulina, B.M., Kurochkina, T.F. & Fazio, F. (2020). Influence of growth on the biological and commercial productivity of Caspian great sturgeon Huso huso. Aquaculture 736139. DOI: 10.1016/j.aquaculture.2020.736139.BakhshalizadehS.ZykovL.A.NasibulinaB.M.KurochkinaT.F.FazioF.2020Influence of growth on the biological and commercial productivity of Caspian great sturgeon Huso husoAquaculture73613910.1016/j.aquaculture.2020.736139Open DOISearch in Google Scholar
Bakhshalizadeh, S., Bani, A., Abdolmalaki, S., Nahrevar, R. & Rastin, R. (2011). Age, growth and mortality of the Persian Sturgeon, Acipenser persicus, in the Iranian waters of the Caspian Sea. Caspian Journal of Environmental Sciences 9(2): 159–167.BakhshalizadehS.BaniA.AbdolmalakiS.NahrevarR.RastinR.2011Age, growth and mortality of the Persian Sturgeon, Acipenser persicus, in the Iranian waters of the Caspian SeaCaspian Journal of Environmental Sciences92159167Search in Google Scholar
Beamish, R.J. & Fournier, D.A. (1981). A method for comparing the precision of a set of age determinations. Canadian Journal of Fisheries and Aquatic Sciences 38: 982–983. DOI: 10.1139/f81-132.BeamishR.J.FournierD.A.1981A method for comparing the precision of a set of age determinationsCanadian Journal of Fisheries and Aquatic Sciences3898298310.1139/f81-132Open DOISearch in Google Scholar
Boscari, E., Vitulo, N., Ludwig, A., Caruso, C., Mugue, N.S. et al. (2017). Fast genetic identification of the Beluga sturgeon and its sought-after caviar to stem illegal trade. Food Control 75: 145–152. DOI: 10.1016/j.foodcont.2016.11.039.BoscariE.VituloN.LudwigA.CarusoC.MugueN.S.2017Fast genetic identification of the Beluga sturgeon and its sought-after caviar to stem illegal tradeFood Control7514515210.1016/j.foodcont.2016.11.039Open DOISearch in Google Scholar
Brennan, J.S. & Cailliet, G.M. (1989). Comparative age-determination techniques for white sturgeon in California. Transactions of the American Fisheries Society 118: 296–310. DOI: 10.1577/1548-8659(1989)118<0296:CATFWS>2.3.CO;2.BrennanJ.S.CaillietG.M.1989Comparative age-determination techniques for white sturgeon in CaliforniaTransactions of the American Fisheries Society11829631010.1577/1548-8659(1989)118<0296:CATFWS>2.3.CO;2Open DOISearch in Google Scholar
Bruch, R.M. & Binkowski, F.P. (2002). Spawning behavior of lake sturgeon (Acipenser fulvescens). Journal of Applied Ichthyology 18(4–6): 570–579. DOI: 10.1046/j.1439-0426.2002.00421.x.BruchR.M.BinkowskiF.P.2002Spawning behavior of lake sturgeon (Acipenser fulvescens)Journal of Applied Ichthyology184–657057910.1046/j.1439-0426.2002.00421.xOpen DOISearch in Google Scholar
Campana, S.E. (2001). Accuracy, precision and quality control in age determination, including a review of the use and abuse of age validation methods. Journal of Fish Biology 59: 197–242. DOI: 10.1111/j.1095-8649.2001.tb00127.x.CampanaS.E.2001Accuracy, precision and quality control in age determination, including a review of the use and abuse of age validation methodsJournal of Fish Biology5919724210.1111/j.1095-8649.2001.tb00127.xOpen DOISearch in Google Scholar
Chang, W.Y.B. (1982). A statistical method for evaluating the reproducibility of age determination. Canadian Journal of Fisheries and Aquatic Sciences 39: 1208–1210. DOI: 10.1139/f82-158.ChangW.Y.B.1982A statistical method for evaluating the reproducibility of age determinationCanadian Journal of Fisheries and Aquatic Sciences391208121010.1139/f82-158Open DOISearch in Google Scholar
Craig, J.M., Thomas, M.V. & Nichols, S.J. (2005). Length–weight relationship and a relative condition factor equation for lake sturgeon (Acipenser fulvescens) from the St Clair River system (Michigan, USA). Journal of Applied Ichthyology 21: 81–85. DOI: 10.1111/j.1439-0426.2004.00635.x.CraigJ.M.ThomasM.V.NicholsS.J.2005Length–weight relationship and a relative condition factor equation for lake sturgeon (Acipenser fulvescens) from the St Clair River system (Michigan, USA)Journal of Applied Ichthyology21818510.1111/j.1439-0426.2004.00635.xOpen DOISearch in Google Scholar
Cyr, E.C. (1991). Aspect of the life history of the tarpon, Megalops atlanticus, from South Unpublished doctoral dissertation. University South Carolina, Columbia, SC, USA.CyrE.C.1991Aspect of the life history of the tarpon, Megalops atlanticus, from SouthUnpublished doctoral dissertation.University South CarolinaColumbia, SC, USASearch in Google Scholar
Dudu, A., Georgescu, S.E. & Costache, M. (2014). Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon species. Genetics and Molecular Biology 37(3): 587–597. DOI: 10.1590/S1415-47572014000400016.DuduA.GeorgescuS.E.CostacheM.2014Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon speciesGenetics and Molecular Biology37358759710.1590/S1415-47572014000400016Open DOISearch in Google Scholar
Dunlop, E.S., Shuter, B.J. & Ridgway, M.S. (2005). Isolating the influence of growth rate on maturation patterns in the small mouth bass (Micropterus dolomieu). Canadian Journal of Fisheries and Aquatic Sciences 62: 844–853. DOI: 10.1139/F05-045.DunlopE.S.ShuterB.J.RidgwayM.S.2005Isolating the influence of growth rate on maturation patterns in the small mouth bass (Micropterus dolomieu)Canadian Journal of Fisheries and Aquatic Sciences6284485310.1139/F05-045Open DOISearch in Google Scholar
Favro, L.D., Kuo, P.K. & Mcdonald, J.F. (1979). Population-genetic study of the effects of selective fishing on the growth rate of trout. Journal of the Fisheries Research Board of Canada 36: 552–561. DOI: 10.1139/f79-079.FavroL.D.KuoP.K.McdonaldJ.F.1979Population-genetic study of the effects of selective fishing on the growth rate of troutJournal of the Fisheries Research Board of Canada3655256110.1139/f79-079Open DOISearch in Google Scholar
Fazli, H., Tavakoli, M., Khoshghalb, M.R.B. & Moghim, M. (2020). Biological parameters and fisheries indices of beluga sturgeon Huso huso in the southern Caspian Sea. Croatian Journal of Fisheries 78: 1–10. DOI: 10.2478/cjf-2020-0001.FazliH.TavakoliM.KhoshghalbM.R.B.MoghimM.2020Biological parameters and fisheries indices of beluga sturgeon Huso huso in the southern Caspian SeaCroatian Journal of Fisheries7811010.2478/cjf-2020-0001Open DOISearch in Google Scholar
Froese, R. & Pauly, D. (2019). FishBase. World Wide Web electronic publication. Retrieved November 20, 2020, from http://www.fishbase.org/Summary/SpeciesSummary.php?ID=2067&AT=Beluga.FroeseR.PaulyD.2019FishBase. World Wide Web electronic publicationRetrieved November 20, 2020, from http://www.fishbase.org/Summary/SpeciesSummary.php?ID=2067&AT=Beluga.Search in Google Scholar
Ghadirnejad, H., Aghilinejad, M., Laloei, F., Asalollahi, M., Shabani, A. et al. (2010). Global population structure of the great sturgeon (Huso huso) in the southern part of the Caspian Sea with emphasis on the Golestan Province. Iranian Fisheries Science Research Institute, Tehran, Iran.GhadirnejadH.AghilinejadM.LaloeiF.AsalollahiM.ShabaniA.2010Global population structure of the great sturgeon (Huso huso) in the southern part of the Caspian Sea with emphasis on the Golestan ProvinceIranian Fisheries Science Research InstituteTehran, IranSearch in Google Scholar
Glass, W.R., Corkum, L.D. & Mandrak, N.E. (2011). Pectoral fin ray aging: an evaluation of a non-lethal method for aging gars and its application to a population of the threatened Spotted Gar. Environmental Biology of Fishes 90: 235–242. DOI: 10.1007/s10641-010-9735-5.GlassW.R.CorkumL.D.MandrakN.E.2011Pectoral fin ray aging: an evaluation of a non-lethal method for aging gars and its application to a population of the threatened Spotted GarEnvironmental Biology of Fishes9023524210.1007/s10641-010-9735-5Open DOISearch in Google Scholar
Graham, L.J. & Murphy, B.R. (2007). The Decline of the Beluga Sturgeon: A Case Study about Fisheries Management. Journal of Natural Resources and Life Sciences Education 36: 66–75. DOI: 10.2134/jnrlse2007.36166x.GrahamL.J.MurphyB.R.2007The Decline of the Beluga Sturgeon: A Case Study about Fisheries ManagementJournal of Natural Resources and Life Sciences Education36667510.2134/jnrlse2007.36166xOpen DOISearch in Google Scholar
Gulland, J.A. (1983). Fish stock assessment: a manual of basic methods. FAO (United Nations Food and Agriculture Organization) New York: Wiley.GullandJ.A.1983Fish stock assessment: a manual of basic methodsFAO (United Nations Food and Agriculture Organization)New YorkWileySearch in Google Scholar
Holčík, J. (1989). The freshwater fishes of Europe, Volume 1, Part 2: General introduction to fishes: Acipenseriformes. AULA Verlag Wiesbaden, Germany.HolčíkJ.1989The freshwater fishes of Europe, Volume 1, Part 2: General introduction to fishes: AcipenseriformesAULA Verlag WiesbadenGermanySearch in Google Scholar
Karayev, R.A. (2006). Modelling Caspian sturgeon population dynamics: a new paradigm and new technology. ICES Journal of Marine Science 63: 980–994. DOI: 10.1016/j.icesjms.2006.03.015.KarayevR.A.2006Modelling Caspian sturgeon population dynamics: a new paradigm and new technologyICES Journal of Marine Science6398099410.1016/j.icesjms.2006.03.015Open DOISearch in Google Scholar
Kazemi, R., Yousefi Jourdehi, A., Pourdehghani, M., Dejhandian, S., Hallajian, A. et al. (2014). Classification of sex and maturity stages of farmed great sturgeon (Huso huso) using blood plasma steroid hormone and calcium ion levels. Iranian Journal of Fisheries Sciences 13(3): 597–607.KazemiR.Yousefi JourdehiA.PourdehghaniM.DejhandianS.HallajianA.2014Classification of sex and maturity stages of farmed great sturgeon (Huso huso) using blood plasma steroid hormone and calcium ion levelsIranian Journal of Fisheries Sciences133597607Search in Google Scholar
Kosarev, A.N. & Yablonskaya, E.A. (1994). The Caspian Sea. The Hague: SPB Academic Publishing.KosarevA.N.YablonskayaE.A.1994The Caspian SeaThe HagueSPB Academic PublishingSearch in Google Scholar
King, M. (2013). Fisheries biology, assessment and management. John Wiley & Sons, Australia.KingM.2013Fisheries biology, assessment and managementJohn Wiley & SonsAustraliaSearch in Google Scholar
Law, R. & Rowell, C.A. (1993). Cohort-structured populations, selection responses, & exploitation of the North Sea cod. In T.K. Stokes, J.M. McGlade & R. Law (Eds.), The Exploitation of Evolving Resources (pp. 73–155). Springer-Verlag: Berlin.LawR.RowellC.A.1993Cohort-structured populations, selection responses, & exploitation of the North Sea codInStokesT.K.McGladeJ.M.LawR.(Eds.),The Exploitation of Evolving Resources73155Springer-VerlagBerlin10.1007/978-3-642-48394-3_11Search in Google Scholar
Mirrasooli, E., Ghorbani, R., Gorgin, S., Aghilinejhad, S.M. & Jalali, A. (2019). Factors associated with illegal fishing and fisher attitudes toward sturgeon conservation in the southern Caspian Sea. Mar Policy 100: 107–115. DOI: 10.1016/j.marpol.2018.11.028.MirrasooliE.GhorbaniR.GorginS.AghilinejhadS.M.JalaliA.2019Factors associated with illegal fishing and fisher attitudes toward sturgeon conservation in the southern Caspian SeaMar Policy10010711510.1016/j.marpol.2018.11.028Open DOISearch in Google Scholar
Morison, A.K., Robertson, S.G. & Smith, D.C. (1998). An integrated system for production fish aging: image analysis and quality assurance. North American Journal of Fisheries Management 18: 587–598. DOI: 10.1577/1548-8675(1998)018<0587:AISFPF>2.0.CO;2.MorisonA.K.RobertsonS.G.SmithD.C.1998An integrated system for production fish aging: image analysis and quality assuranceNorth American Journal of Fisheries Management1858759810.1577/1548-8675(1998)018<0587:AISFPF>2.0.CO;2Open DOISearch in Google Scholar
Olsen, E.M., Lilly, G.R., Heino, M., Morgan, M.J., Brattey, J. et al. (2005). Assessing changes in age & size at maturation in collapsing populations of Atlantic cod (Gadus morhua). Canadian Journal of Fisheries and Aquatic Sciences 62: 811–23. DOI: 10.1139/f05-065.OlsenE.M.LillyG.R.HeinoM.MorganM.J.BratteyJ.2005Assessing changes in age & size at maturation in collapsing populations of Atlantic cod (Gadus morhua)Canadian Journal of Fisheries and Aquatic Sciences628112310.1139/f05-065Open DOISearch in Google Scholar
Onara, D., Holostenco, D., Paraschiv, M. & Suciu, R. (2014). Preliminary genetic variability of Lower Danube River young of the year (YOY) beluga sturgeon Huso huso (Linnaeus, 1758) using mtDNA markers. Journal of Applied Ichthyology 30: 1286–1289. DOI: 10.1111/jai.12596.OnaraD.HolostencoD.ParaschivM.SuciuR.2014Preliminary genetic variability of Lower Danube River young of the year (YOY) beluga sturgeon Huso huso (Linnaeus, 1758) using mtDNA markersJournal of Applied Ichthyology301286128910.1111/jai.12596Open DOISearch in Google Scholar
Pirogoviskiy, M.I. & Fadeyeva, T.A. (1982). The size-age composition of the Stellate Sturgeon, Acipenser stellatus, during the marine period of life. Vopr Ichthyology 5: 54–63.PirogoviskiyM.I.FadeyevaT.A.1982The size-age composition of the Stellate Sturgeon, Acipenser stellatus, during the marine period of lifeVopr Ichthyology55463Search in Google Scholar
Pourkazemi, M. (2006). Caspian Sea sturgeon Conservation and Fiseries: Past present and Future. Journal of Applied Ichthyology 22: 12–16. DOI: 10.1111/j.1439-0426.2007.00923.x.PourkazemiM.2006Caspian Sea sturgeon Conservation and Fiseries: Past present and FutureJournal of Applied Ichthyology22121610.1111/j.1439-0426.2007.00923.xOpen DOISearch in Google Scholar
Ricker, W.E. (1975). Computation and interpretation of biological statistics of fish population. Bulletin of the Fisheries Research Board of Canada 191: 1–382.RickerW.E.1975Computation and interpretation of biological statistics of fish populationBulletin of the Fisheries Research Board of Canada1911382Search in Google Scholar
Rien, T.A. & Beamesderfer, R.C. (1994). Accuracy and precision of white sturgeon age estimates from pectoral fin rays. Transactions of the American Fisheries Society 123: 255–265. DOI: 10.1577/1548-8659(1994)123<0255:AAPOWS>2.3.CO;2.RienT.A.BeamesderferR.C.1994Accuracy and precision of white sturgeon age estimates from pectoral fin raysTransactions of the American Fisheries Society12325526510.1577/1548-8659(1994)123<0255:AAPOWS>2.3.CO;2Open DOISearch in Google Scholar
Rijnsdorp, A.D. (1989). Maturation of male & female North Sea plaice (Pleuronectes platessa L). ICES Journal of Marine Science 46: 35–51. DOI: 10.1093/icesjms/46.1.35.RijnsdorpA.D.1989Maturation of male & female North Sea plaice (Pleuronectes platessa L)ICES Journal of Marine Science46355110.1093/icesjms/46.1.35Open DOISearch in Google Scholar
Roff, D.A. (1984). The evolution of life histories parameters in teleosts. Canadian Journal of Fisheries and Aquatic Sciences 41: 989–1000. DOI: 10.1139/f84-114.RoffD.A.1984The evolution of life histories parameters in teleostsCanadian Journal of Fisheries and Aquatic Sciences41989100010.1139/f84-114Open DOISearch in Google Scholar
Rosten, C.M., Onara, D., Hawley, K. & Suciu, R. (2012). The status of Danube beluga sturgeon (Huso huso): Past, present and future. VANN 47(4): 523–534.RostenC.M.OnaraD.HawleyK.SuciuR.2012The status of Danube beluga sturgeon (Huso huso): Past, present and futureVANN474523534Search in Google Scholar
Ruban, G., Khodorevskaya, R. & Shatunovskii, M. (2019). Factors influencing the natural reproduction decline in the beluga (Huso huso, Linnaeus, 1758), Russian sturgeon (Acipenser gueldenstaedtii, Brandt & Ratzeburg, 1833), and stellate sturgeon (A. stellatus, Pallas, 1771) of the Volga–Caspian basin: A review. Journal of Applied Ichthyology 35: 387–395. DOI: 10.1111/jai.13885.RubanG.KhodorevskayaR.ShatunovskiiM.2019Factors influencing the natural reproduction decline in the beluga (Huso huso, Linnaeus, 1758), Russian sturgeon (Acipenser gueldenstaedtii, Brandt & Ratzeburg, 1833), and stellate sturgeon (A. stellatus, Pallas, 1771) of the Volga–Caspian basin: A reviewJournal of Applied Ichthyology3538739510.1111/jai.13885Open DOISearch in Google Scholar
Ruban, G.I. & Khodorevskaya, R.P. (2011). Caspian Sea sturgeon fishery: a historic overview. Journal of Applied Ichthyology 27: 199–208. DOI: 10.1111/j.1439-0426.2011.01725.x.RubanG.I.KhodorevskayaR.P.2011Caspian Sea sturgeon fishery: a historic overviewJournal of Applied Ichthyology2719920810.1111/j.1439-0426.2011.01725.xOpen DOISearch in Google Scholar
Saborowski, R. & Buchholz, F. (1996). Annual changes in the nutritive state of North Sea. Journal of Fish Biology 49: 173–194. DOI: 10.1111/j.1095-8649.1996.tb00015.x.SaborowskiR.BuchholzF.1996Annual changes in the nutritive state of North SeaJournal of Fish Biology4917319410.1111/j.1095-8649.1996.tb00015.xOpen DOISearch in Google Scholar
Saila, G.B., Recksiek, C.W. & Prager, M.H. (1988). Basic fishery science programs. A compendium of microcomputer programs and manual of operation. Developments in Aquaculture and Fisheries Science 18: 1–203.SailaG.B.RecksiekC.W.PragerM.H.1988Basic fishery science programs. A compendium of microcomputer programs and manual of operationDevelopments in Aquaculture and Fisheries Science181203Search in Google Scholar
Sainsbury, K.J. (1980). Effect of individual variability on the von Bertalanffy growth equation. Canadian Journal of Fisheries and Aquatic Sciences 37: 241–247. DOI: 10.1139/f80-031.SainsburyK.J.1980Effect of individual variability on the von Bertalanffy growth equationCanadian Journal of Fisheries and Aquatic Sciences3724124710.1139/f80-031Open DOISearch in Google Scholar
Sandu, C., Reinartz, R. & Bloesch, J. (Eds.). (2013). “Sturgeon 2020”: A program for the protection and rehabilitation of Danube sturgeons. Danube Sturgeon Task Force (DSTF) & EU Strategy for the Danube River (EUSDR) Priority Area (PA) 6 – Biodiversity. Bucharest, Romania.SanduC.ReinartzR.BloeschJ.(Eds.).2013“Sturgeon 2020”: A program for the protection and rehabilitation of Danube sturgeonsDanube Sturgeon Task Force (DSTF) & EU Strategy for the Danube River (EUSDR) Priority Area (PA) 6 – BiodiversityBucharest, RomaniaSearch in Google Scholar
Scarnecchia, D.L., Ryckman, L.F., Lim, Y., Schmitz, B.J. & Firehammer, J.A. (2007). Life history and the costs of reproduction in Northern Great Plains Paddlefish (Polyodon spathula) as a potential framework for other Acipenseriform fishes. Reviews in Fisheries Science & Aquaculture 15(3): 211–263. DOI: 10.1080/10641260701486981.ScarnecchiaD.L.RyckmanL.F.LimY.SchmitzB.J.FirehammerJ.A.2007Life history and the costs of reproduction in Northern Great Plains Paddlefish (Polyodon spathula) as a potential framework for other Acipenseriform fishesReviews in Fisheries Science & Aquaculture15321126310.1080/10641260701486981Open DOISearch in Google Scholar
Stamps, J.A. (1993). Sexual size dimorphism in species with asymptotic growth after maturity. Biological Journal of the Linnean Society 50: 123–145. DOI: 10.1111/j.1095-8312.1993.tb00921.x.StampsJ.A.1993Sexual size dimorphism in species with asymptotic growth after maturityBiological Journal of the Linnean Society5012314510.1111/j.1095-8312.1993.tb00921.xOpen DOISearch in Google Scholar
Ta’ati, R., Soltani, M., Bahmani, M. & Zamini, A. (2011). Growth performance, carcass composition, and immunophysiological indices in juvenile great sturgeon (Huso huso) fed on commercial prebiotic. Iranian Journal of Fisheries Sciences 10(2): 324–335.Ta’atiR.SoltaniM.BahmaniM.ZaminiA.2011Growth performance, carcass composition, and immunophysiological indices in juvenile great sturgeon (Huso huso) fed on commercial prebioticIranian Journal of Fisheries Sciences102324335Search in Google Scholar
Taghavi-Motlagh, S.A. (2001). An estimation of growth parameters, mortality rates and yield-per-recruit for Beluga (Huso huso) living in Caspian Sea. Iranian Journal of Fisheries Sciences 3: 25–48.Taghavi-MotlaghS.A.2001An estimation of growth parameters, mortality rates and yield-per-recruit for Beluga (Huso huso) living in Caspian SeaIranian Journal of Fisheries Sciences32548Search in Google Scholar
Tavakoli, M. & Khoshghalb, M.R.B. (2018). Investigation on catch trend and caviar of (Huso huso Brandt, 1865) in the Iranian waters of the Caspian Sea during 2005–2015. Journal of Wetland Ecobiology 37: 5–12.TavakoliM.KhoshghalbM.R.B.2018Investigation on catch trend and caviar of (Huso huso Brandt, 1865) in the Iranian waters of the Caspian Sea during 2005–2015Journal of Wetland Ecobiology37512Search in Google Scholar
Ustaoğlu, S. & Okumuş, I. (2004). The Sturgeons: Fragile species need conservation. Turkish Journal of Fisheries and Aquatic Sciences 4: 49–57.UstaoğluS.OkumuşI.2004The Sturgeons: Fragile species need conservationTurkish Journal of Fisheries and Aquatic Sciences44957Search in Google Scholar
Williot, P., Sabeau, L., Gessner, J., Arlati, G., Bronzi, P. et al. (2001). Sturgeon farming in Western Europe: recent developments and perspectives. Aquatic Living Resources 14: 367–374.WilliotP.SabeauL.GessnerJ.ArlatiG.BronziP.2001Sturgeon farming in Western Europe: recent developments and perspectivesAquatic Living Resources1436737410.1016/S0990-7440(01)01136-6Search in Google Scholar
World Conservation Monitoring Centre (WCMC). (2010). Review of four sturgeon species from the Caspian Sea basin. Retrieved December 21, 2020, from http://ec.europa.eu/environment/cites/pdf/reports/caspian_sea_sturgeon.pdfWorld Conservation Monitoring Centre (WCMC)2010Review of four sturgeon species from the Caspian Sea basinRetrieved December 21, 2020, from http://ec.europa.eu/environment/cites/pdf/reports/caspian_sea_sturgeon.pdfSearch in Google Scholar