Hucho hucho in Croatia Past and present

Hucho hucho in Croatia

Past and present

prof. dr. sc. Milorad Mrakovčić, PMF Zagreb

prof.dr. sc. Tomislav Treer, Agronomski fakultet Zagreb

doc. dr. sc. Marko Ćaleta, Učiteljski fakultet Zagreb

Drava river

Catch from 1937(often over 22 kg)

Very rare catch from 1996

Dams on the Drava river

HE Čakovec

Catch from Austra in 2005

Kupa river

Usual catch

Wednesday, May 19, 2010

Winter Hucho hucho from Kupa river - C&R(

This beautiful Hucho hucho has been caught in river Kupa at this

winter. Happy fisherman is Jure Ramovž, and fish is 93 cm long.

This catch was recorded and will be a part of DVD movie about

Kupa walley. Congratulations to Jure, especially for releasing the

fish back to the river! This fish is evidence that our beautiful river

Kupa has some real beasts inside.

Una riverBosanska Krupa

1 mil. $ from EU;

Sava river

Huchen were caught to 10

km downstream of Zagreb

Dobra river

Dobra before HE plant

Building the plant

Finished HE Lešće

EKOLOŠKE I STRUKTURALNE ZNAČAJKE IHTIOFAUNE GOJAČKE DOBRE

M. Mrakovčić, M. Ćaleta, P. Mustafić, Z. Marčić i D. Zanella

Ovaj dio toka je jedno od posljednjih mrjestilišta ribe mladice u Hrvatskoj.Brana će joj onemogućiti migracije, a akumulacija potopiti pogodna staništa za mrijest.

Ovdje živi 45 vrsta riba, među njima je i mladica (Hucho hucho) - ugrožena vrsta u Hrvatskoj i Europi

Temperature vode rijeke Dobre na postajama Gojak i Lipa

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– Second Outline Level

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Usporedba zastupljenosti pojedinih vrsta riba u ulovu s modelom logaritamske serije

Eudominantne vrste 66,7%

Alburnoides bipunctatus – dvoprugasta uklija

Phoxinus phoxinus – pijor

Subdominantne vrste 4-8%

Barbus balcanicus – potočna mrena Squalius cephalus – klen

Rhodeus amarus – gavčica

Dominantnost vrsta rijeke Dobre

Rutilus virgo – plotica

Recendentne vrste 2-4%

Cottus gobio – peš Gobio obtusirostris – obična krkuša

Cobitis elongatoides – vijun

Subrecendentne vrste 1-2%

Salmo trutta – potočna pastrva

Barbus barbus – mrena

Barbatula barbatula – brkica

Sporadične vrste < 1%

Cobitis elongata – veliki vijun

Eudontomyzon sp. - paklara

Lepomis gibbosus - sunčanica Onchorhynchus mykiss – kalifornijska pastrva

Sabanejewia balcanica – zlatni vijun

Kišpatić, Pažur & Mateš

Kišpatić book from 1893(“...it is caught very often in the Sava and Drava rivers...”)(”... during spawning it is easy to prick it by harpoon...”)

Prof. dr. Krešo Pažur preparing for PhD celebration

POACHINGDr. Walter Weber, first president of the Union of sport fishing organizations of Kingdom SCS at the founding of Union in 1926: “Neglecting of waters and fisheries, greedy and predatory use of fish in them, and huge number of poachers destroyed our waters, that were so beautiful and rich, and made them empty and devastated.”

Official catch data of Hucho huchoin Croatia from 2004 to 2011

River Kupa River Drava

Year kg number kg number

2004. 14 2

2005. 26 8

2006. 10 1

2007. 10 1 7 1

2008. 25,6 3

2009. 16 2

2010. 12,5 2

2011. 23,4 5

Total 88,1 11 33 9

Catch by postgraduate student Goran Jakšić from 2009-2011 + 10 smaller specimens (from 20 to 40 cm).

River DateWater

level

Temperature

(˚C)

Angling

duration

(hours)

TL

(cm) Mass (kg)

Artificial

bait

Una 17/10/09 low > 0 ˚C 8 70 3,5 meps

Una 18/10/09 low > 0 ˚C 6 70 3,5 vobler

Una 18/10/09 low > 0 ˚C 6 75 4,5 meps

Kupa 12/12/09 growing < 0 ˚C 6 65 2,5 vobler

Kupa 12/12/09 growing < 0 ˚C 6 60 2,0 vobler

Una 30/11/10 middle -17 ˚C 5 80 5,0 cof

Kupa 9/12/11 growing > 0 ˚C 4 70 3,0 vobler

Kupa 11/12/11 middle > 0 ˚C 3 90 8,0 vobler

Kupa 23/12/11 middle < 0 ˚C 4 80 5,5 cof

Growth in length (cm of TL)(Sabioncello, 1970; Pažur, 1982; Radević, 1999)

140

120

100

40

20

0

60

80

0 2 4 6

age (years)

8 10

12

T L (cm)

Dobra 1970

Kupa 1970

Dobra 1982

Kupa 1982

Una 1982

Vrbas 1999

Growth of huchen in Dobra, Kupa and Una in 1970 and 1982, compared to Vrbas 1999

Growth in length (cm of TL)

AgeDobra

1970

Kupa

1970

Dobra

1982

Kupa

1982

Una

1982

Vrbas

1999

1 38,5 33,3 30 33 34 16,32

2 44,5 37,8 41,5 38,5 36 32,24

3 52,3 48,9 51,67 47,93 46,33 44,71

4 60,7 58,3 61,36 56,22 53,4 55,34

5 70,6 67,2 66,12 66,12 65 64,2

6 79,6 79 74,29 73,25 67,64 72,42

7 92 90 82,12 81,43 73,33 80,2

8 96,5 96,5 94,5 95,67 89,33 86,14

9 110,6 106,6 103 98,33

10 115 119 108,25 119 106

11 120

Conclusions

• Data deficient (need for further

investigations)

• Problems: glob. worming, hab.degradation,

dams, pollution,, poaching

• Length growth slower in recent years

• L-W negative allometric growth (<3)

• Stocking

(Bunn et al. 2002)