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Growth of tagged common carp (Cyprius carpio) in selected water reservoirs, Morava River drainage area
Prokeš, Miroslav ; Baruš, Vlastimil ; Habán, V. ; Mareš, J. ; Peňáz, Milan ; Halačka, Karel ; Krejčí, R. ; Vetešník, Lukáš
The project monitoring the growth of tagged two-season-old common carp (K2) being stocked into the selected reservoirs managed by the Moravian Angler Association was initiated in 2001 in the reservoir of Nové Mlýny. Few other reservoirs, namely the Dalešická, Brněnská, Vranovská and Letovická, were then also studied in course of the following period up today. The altitude of investigated reservoirs ranges 171-382 m a.s.l., the flooded area of water bodies 104-1600 hectares. The stocking series in every of reservoirs were performed in the course of subsequent five years and two thousands of tagged carps (K2) were always yearly stocked in every of reservoirs. In total, 50 335 (17.61 inds per hectare) tagged carps have been stocked and 1361 individuals (0.48 inds per hectare) were recaptured and reported by the anglers. The mean recapture rate of tagged fish reached thus 2.70 % (1.02 - 4.74 %). A significant negative relationship was also ascertained of altitude (in m a.s.l.) and growth indices. The maximum growth rate was found in the Novomlýnská reservoir (mean annual weight increment 1725 g). Gradually lower weight increments were found out in the Vranovská reservoir (1064 - 1200 g), Dalešická R. (1050 g), Brněnská R. (1070 g) and Letovická R. (630 g). A similar sequence existed also in growth of other parameters studied, i.e. total length (TL), specific growth rate (SGR), and weight condition expressed by means of the Fulton condition factor (FCF). On the basis of these results, some new, more convenient, rules were suggested for stocking of common carp.
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Fish assemblage and its exploitation in the Nové Mlýny reservoirs system
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan
The fish assemblage and its exploitation in the Nové Mlýny reservoirs in 1986–2008 were analysed. Occurrence of 41 fish species (from 12 families) and 3-5 types of hybrids were registered. Newly the tubenose goby (Proterorhinus marmoratus) invaded the Věstonice and Nové Mlýny reservoirs. Dominance of autochthonous (riverine) fish species decreased. On the contrary, expressive increasing of Prussian carp (Carassius gibelio) and wels catfish (Silurus glanis) was ascertained. Average values of fish species diversity (H') and catch effort by entangling netting (C.P.U.E.) were 1,36 and 53.11 g.m2.h-1, respectively. The overall yearly yield in the Nové Mlýny reservoirs reached its maximum values in 1994 and 1995 with 153.1 and 148.8 kg.h-1 (474.6 and 461.3 tons). Annual fish catch (inclusive of common carp Cyprinus carpio) since 1995 to 2008 subsequently decreased. Currently (2008), it amounts 37.6 kg.h-1 and 116.5 tons, with a predominance of common carp (Dw = 64.5%).
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Spatio-temporal distribution of catches, growth and length-weight relationship of tagged common carp (Cyprinus carpio) in the fishing ground MRS Dyje 5, Novomlýnská reservoir, and in the related fishing grounds
Prokeš, Miroslav ; Baruš, Vlastimil ; Mareš, J. ; Habán, V. ; Peňáz, Milan
On the basis of spatio-temporal analyses of recaptured tagged common carp, the local movements (migrations), growth and length-weight parameters were monitored in the Novomlýnská reservoir. Generally, 28 % of fish migrated upstream within the distance of 28.9 km, 19 % of tagged recaptured fish migrated in downstream direction up to a distance of 30.5 km and 53 % of the studied fishs were stationary in the Novomlýnská reservoir. The highest migration activity was ascertained during the 1st and 2nd year after stocking. The recapture rate of the overall 10.000 stocked fish, was only 1 %. Already 12 months after stocking, the mean total length (TL) of recaptured fish reached 465 mm, weight (w) 2200 g and Fulton´s condition factor (FWCF) 2.45.
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Common carp (Cyprinus carpio) growth and distribution in the Brno and Dalešice reservoirs
Prokeš, Miroslav ; Mareš, J. ; Baruš, Vlastimil ; Habán, V. ; Peňáz, Milan
The study of growth and distribution parameters in tagged carp (Cyprinus carpio) from the canyon-shaped dam reservoirs (Brno and Dalešice) was performed. Altogether, 59 (1.5%) and 274 (4.6%) individuals from the Brno and Dalešice reservoirs, respectively, were re-captured and documented (by anglers) from originally 4000 and 6000 tagged fish released. The growth performance of tagged fish (two-year-old carp K2) was only moderate during the first year after stocking in the Brno reservoir (for time span d0-d360 it corresponds to TL = 304-384 mm, w = 497-1170 g, and SGR = 0.2378 %.d-1), very similar to that in the Dalešice reservoir (d0-d360 TL= 301-386 mm, w = 510-1215 g and SGR = 0,2399 %.d-1). The condition parameters (TL:w and FWC) were very similar as well. Different distributional patterns of the catches were however recorded. The growth performance of carp in the Brno reservoir was lower than expected on the basis of its altitude and mean annual water temperature.
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Exploatation characteristic of barbel, nase, chub and ide in the riverine and lake ecosystems
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan
The exploatation characteristics of four potamodromous fish species, barbel (Barbus barbus), nase (Chondrostoma nasus), chub (Leuciscus cephalus) and ide (L. idus) obtained in the riverine and so-called lacustrine (man-made lake) ecosystem, exemplified on the fishing ground Dyje 7 on the river Dyje, is documented. Based on the analyse of many-year catch data of mentioned fish species, the influence of stream fragmentation was revealed upon the abundance reduction of natural populations of rheophilic fish species of concerning Dyje river sectin (located at the Mušov reservoir), as well as a necessity of strengthening these populations in the adjacent stream sections, especially by stocking of artificially produced fry, and in near future also by the construction of the new functional fish ladders.
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Using of biocide Diazinon 60 EC in fish farming and its toxicity for fish and another water organisms
Máchová, J. ; Prokeš, Miroslav ; Faina, R. ; Kroupová, H. ; Svobodová, Z. ; Peňáz, Milan ; Baruš, Vlastimil
Diazinon 60 EC (chemical insecticide, organophosphate, active substance diazinon at a concentration of 600 g/l) is used in fish-farming in well-founded cases as a biocide to supress excessive propagation of coarse daphnian zooplankton (used concentration of Diazinon 60 EC 0,010 mg/l). Diazinon 60 EC is highly toxic for daphnian zooplankton (48hEC50 = 0,00029 mg/l by the using of artificially prepared adulterating water according to the standard and 48hEC50 = 0,0029 mg/l by the using of pond water). Toxicity of Diazinon 60 EC is markedly lower for other water organisms (96hLC50 for Poecilia reticulata, Cyprinus carpio and Orcorhynchus mykiss are in the range 3-10 mg/l and 72hIC50 for Desmodesmus subspicatus = 10 mg/l). At the concentration of 0,01 mg/l (i.e. 100 g per 1 ha at 1 m mean depth of the pond), Diazinon 60 EC can highly selectively eliminate daphnian zooplankton, causes no harm to fish and is reltively quickly decomposed in the aquatic environment.
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Growth comparison of the (1+) juvenile sterlet (Acipenser ruthenus) by using experimental and commercial diet
Baránek, V. ; Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan ; Cileček, M. ; Mareš, J. ; Jirásek, J. ; Spurný, P.
The aim of this experiment was to check the growth rate of the (1+) juvenile sterlet. The experiment was proceeded during the 42-days period (25 July - 4 September 2005) in the hatchery of the Pohořelice Pond Fisheries. The fish were kept in four flow through tanks. In total, 45 individuals were stocked in each tank. Fish were fed by experimental (44/12) and commercial diet (Pro Aqua Brutfutter 57/15, Skretting) in two repetitions. Our experiment confirmed very good growth ability of the juvenile sterlet, together with low FCR parameter. Sterlet may be considered as an appropriate fish for intensive aquaculture and also, as a native species of the Czech Republic for stocking into Czech running waters.
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Occurrence and characteristics of ide (Leuciscus idus Linnaeus, 1758) catches in drainage area of the Morava River
Prokeš, Miroslav ; Baruš, Vlastimil ; Peňáz, Milan
The ide, Leuciscus idus belongs to autochthonous, less numerous and endangered (vulnerable) fish species of the Czech Republic. In 2004, the fishing on ide was conducted on 51 non-salmonid (NS) fishing-grounds of the Moravian Anglers Union (MAU) on water area of 4622.4 ha. In total, 432 ides (= 0.31 ind.ha-1; 0.25 % of all captured fish) and 332 kg of ide biomass (= 0.23 kg.ha-1, = 0.10 % of total mass of captured fish) were captured in 2004. Mean individual mass of ide was 0.78 kg. In the period 1990-2004, 0.11 ind.ha-1 (= 0.067 % of all captured fish) and 0.075 kg.ha-1 (= 0.035 % of total mass of captured fish) in the NS fish-grounds of MAU were captured yearly. During 1953-1978, 1.67 ind.ha-1 and 1.41 kg.ha-1 of the ide were captured yearly in the riverine fishing-ground Dyje 7. General trend of catches is decreasing. Legislative species protection, artificial reproduction and restocking of fish fry and 1+ juveniles were realized.
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