Downstream movement of YOY beluga sturgeons ... - DANUBEPARKS

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Downstream movement of YOY beluga sturgeons ... - DANUBEPARKS

Installing 7 VR2 automatic receiverarrays in the Danube River – May 2010


The “Jewels of the Crown” and theset up of acoustic tagging on thebank of the river at rkm 123


Acoustic telemetry in YOYbeluga of year 2010


Acoustic telemetry of farmedfry belugaTamadau and Danube / August 24 - 25 2010


Implanting the tags


Lifting up the VR2 transects25 – 30.10.2010VR 2


Map of VemcoVR2VR2 arraysset in the DanubeVacareni, rkm 123ABCGED FChilla Br.HSulina Br.BGAYOY monitoring and releasing sitefor wild tagged YOY beluga in 2010Releasing site of farmed tagged YOY belugaRecovered VR 2 receiver arraySingle standing VR 2 receiverHarsova,rkm 238Stelnica - Borcea km 40Isaccearkm 100Tulcearkm 70Black SeaLost VR 2 receiver arrayRed Rock, rkm 310Oltenitarkm 430100 km


Results1. Recording of YOY carrying acoustic transmittersOriginNo.TaggedNo.recordedWild 32 20Farmed 26 26


2. Velocity of downstream movementOriginAge[mo/y]TW[g]SL[cm]Distance(KM) /No of daysVelocity[Km/ Km/day]Migration routeW1 month 27 13.5 165 Km /2 daysd[m/sec]32.8 0.95 Reni (rKm 123 ) →Sf. Gheorghe (Km 5)F 3.5monthsF 3.5months131 24 327 Km /5 days154 26 144 Km /2 days51.88 0.75 Stelnica (rKm 300) → Sf.Gheorghe57,74 0.83 Isaccea (rKm 102) → Sf.GheorgheF *** 1.5 years 460 48 655 Km /10 days65,5 0.75 Ercsi / downstreamBudapest (DKm 1615) →Tekija / Serbia (DKm 960)*** - data by courtesy of Miklos Pannonhalmi / Water Directorate Györ, Hungary


3. Routes of downstream migrationFrequency of tagged fishOriginReleasinglocationChiliaBranch%RouteSt. GeorgeBranch%Unknown% TotalWild RKm 123 2,17 26,09 15,22 43,48FarmedFarmedBorcea RKm40 15,22 4,35 8,70 28,26Isaccea RKm102 23,91 2,17 2,17 28,2641,30 32,61 26,09 100,00


4. Molecular genetic analysis on tagged beluga wild &farmedRFLP of D-loopmtDNA1. Frequency of Wild YOY beluga sturgeonsRoute [%] (N=20)0.60Haplotype frequency - wild YOY 2010 with acoustic tags(N=20)HaplotypeChiliaBranchSt.GeorgeBranchUnknownTotal%0.500.400.30AB (1), 0.50BA (3), 0.30AB (1) 5.0 35.0 5.0 45.00.20AA (4), 0.20BA (3) 0.0 10.0 10.0 20.0AA (4) 0.0 5.0 10.0 15.0missingsample 0.0 10.0 10.0 20.0Total 5.0 60.0 35.0 100.00.100.00Haplotype2. The farmed fish have AB haplotype – the most frequent one


Conclusions1. Movement velocity of tagged fish ~ water velocity;2. 26,09% of wild YOY migrated on St. George branch;3. 39.13% of farmed beluga migrated on Chilia branch;4. Wild YOY (selected for large size for tagging) belongto 3 genetic groups;5. Farmed fish belong to the most frequent geneticgroup (haplotype AB );6. So far a particular migration behavior – could not berelated to a particular haplotype;


THANK YOU FOR YOUR ATTENTION!

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