Hucho hucho in Croatia

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Hucho hucho in Croatia Past and present
prof. dr. sc. Milorad Mrakovcic, PMF
Zagreb prof.dr. sc. Tomislav Treer, Agronomski
fakultet Zagreb doc. dr. sc. Marko Caleta,
Uciteljski fakultet Zagreb
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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 Cakovec
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Kupa river
Usual catch
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Wednesday, May 19, 2010 Winter Hucho hucho from
Kupa river - CR ( 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.
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Una river
Bosanska Krupa 1 mil. from EU
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Sava river
Huchen were caught to 10 km downstream of Zagreb
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Dobra river
Dobra before HE plant
Building the plant
Finished HE Lešce
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EKOLOŠKE I STRUKTURALNE ZNACAJKE IHTIOFAUNE
GOJACKE DOBRE M. Mrakovcic, M. Caleta, P.
Mustafic, Z. Marcic i D. Zanella
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Ovdje živi 45 vrsta riba, medu 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 ce
joj onemoguciti migracije, a akumulacija potopiti
pogodna staništa za mrijest.
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Temperature vode rijeke Dobre na postajama Gojak
i Lipa
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Usporedba zastupljenosti pojedinih vrsta riba u
ulovu s modelom logaritamske serije
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Dominantnost vrsta rijeke Dobre
Eudominantne vrste 66,7
Alburnoides bipunctatus dvoprugasta uklija
Phoxinus phoxinus pijor
Subdominantne vrste 4-8
Barbus balcanicus potocna mrena
Squalius cephalus klen
Rhodeus amarus gavcica
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Recendentne vrste 2-4
Subrecendentne vrste 1-2
Salmo trutta potocna pastrva
Barbus barbus mrena
Rutilus virgo plotica
Barbatula barbatula brkica
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Sporadicne vrste lt 1
Cobitis elongata veliki vijun
Eudontomyzon sp. - paklara
Sabanejewia balcanica zlatni vijun
Lepomis gibbosus - suncanica
Onchorhynchus mykiss kalifornijska pastrva
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Kišpatic, Pažur Mateš
Kišpatic 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
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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.
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Official catch data of Hucho hucho in Croatia
from 2004 to 2011
River Kupa River Kupa River Drava 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
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Catch by postgraduate student Goran Jakšic from
2009-2011 10 smaller specimens (from 20 to 40
cm).
River Date Water level Temperature (C) Angling duration (hours) TL (cm) Mass (kg) Artificial bait
Una 17/10/09 low gt 0 C 8 70 3,5 meps
Una 18/10/09 low gt 0 C 6 70 3,5 vobler
Una 18/10/09 low gt 0 C 6 75 4,5 meps
Kupa 12/12/09 growing lt 0 C 6 65 2,5 vobler
Kupa 12/12/09 growing lt 0 C 6 60 2,0 vobler
Una 30/11/10 middle -17 C 5 80 5,0 cof
Kupa 9/12/11 growing gt 0 C 4 70 3,0 vobler
Kupa 11/12/11 middle gt 0 C 3 90 8,0 vobler
Kupa 23/12/11 middle lt 0 C 4 80 5,5 cof
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Growth in length (cm of TL)
(Sabioncello, 1970 Pažur, 1982 Radevic, 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)
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Growth in length (cm of TL)
Age Dobra 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
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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 (lt3)
• Stocking

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(Bunn et al. 2002)
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