Hucho hucho in Croatia Past and present

1. 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

3. Drava river Catch from 1937 (often over 22 kg) Very rare catch from 1996 Dams on the Drava river Catch from Austra in 2005 HE Čakovec

4. Kupa river Usual catch

5. 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.

6. Una river Bosanska Krupa 1 mil. $ from EU;

7. Sava river Huchen were caught to 10 km downstream of Zagreb

8. Dobra river Dobra before HE plant Building the plant Finished HE Lešće

9. EKOLOŠKE I STRUKTURALNE ZNAČAJKE IHTIOFAUNE GOJAČKE DOBRE M. Mrakovčić, M. Ćaleta, P. Mustafić, Z. Marčić i D. Zanella

10. Ovdje živi 45 vrsta riba, među njima je i mladica (Hucho hucho) - ugrožena vrsta u Hrvatskoj i Europi Ovaj dio toka je jedno od posljednjih mrjestilišta ribe mladice u Hrvatskoj. Brana će joj onemogućiti migracije, a akumulacija potopiti pogodna staništa za mrijest.

12. Temperature vode rijeke Dobre na postajama Gojak i Lipa

13. Usporedba zastupljenosti pojedinih vrsta riba u ulovu s modelom logaritamske serije

14. Dominantnost vrsta rijeke Dobre 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

15. 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 Rutilus virgo – plotica Barbatula barbatula – brkica

16. Sporadične vrste < 1% Cobitis elongata – veliki vijun Eudontomyzon sp. - paklara Sabanejewia balcanica – zlatni vijun Lepomis gibbosus - sunčanica Onchorhynchus mykiss – kalifornijska pastrva

17. 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

18. POACHING Dr. 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.”

19. Official catch data of Hucho hucho in Croatia from 2004 to 2011

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

21. Growth in length (cm of TL) (Sabioncello, 1970; Pažur, 1982; Radević, 1999) Growth of huchen in Dobra, Kupa and Una in 1970 and 1982, compared to Vrbas 1999 140 120 100 Dobra 1970 Kupa 1970 Dobra 1982 Kupa 1982 Una 1982 Vrbas 1999 T L (cm) 80 60 40 20 0 0 2 4 8 10 12 6 age (years)

22. Growth in length (cm of TL)

23. 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

24. (Bunn et al. 2002)