Untitled - MendelNet 2013 - Mendelova zemědělská a lesnická ...

MENDELNET 2013and 3) and by the Valšov (responds to locality 1). HOLAS (1955) states that population ofThymallus thymallus had created 52% of fish stock. During the ichthyological survey in 2004 thepopulation of Thymallus thymallus created 3,8 % (locality 2) and 1,68 % (locality 3) of fishcommunity (SPURNÝ et al., 2006). There was no presence of Thymallus thymallus recorded in2012. In 2013, population of Thymallus thymallus created 18,8 % (locality 2) and 3,8 % (locality 3)of fish community (non-published data). During the ichthyological survey in 2013, there was alsoOncorhynchus mykiss detected. This species was found only at locality 2 (size of individual 309mm) and at locality 4 (size of individual 279 mm). Both individuals reached the lowest legal catchsize of 25 cm. Cottus gobio is an eudominant species at locality 1 and, subdominant species atlocalities 2 and 3. Total body length ranges due to locality from 43 mm (locality 2) to 117 mm(locality 3). At three localities 20 individuals of Cottus gobio were captured (locality 1: 6individuals; locality 2: 7 individuals; locality 3: 7 individuals). Population of Cottus poecilopusoccurred at each of 6 localities of Moravice river. At localities 1, 4, 5 and 6 there is Cottuspoecilopus an eudominant species. As subdominant the species is presented at localities 2 and 3.Total body length ranged due to locality from 54 mm (locality 3) to 122 mm (locality 5). At alllocalities there were totally 75 individuals of Cottus poecilopus caught. The highest number ofCottus poecilopus individuals was recorded at locality 6 (24 individuals) and the lowest at locality 3(4 individuals). Ichthyological surveys in fifties of twentieth century established the presence ofCottus gobio and Cottus poecilopus (HOCHMAN, 1957). DYK (1951) confirmed that abundantpresence of Cottus gobio begins from Velká Štáhle (responds with locality 3). Duringichthyological survey in 2013 Rutilus rutilus was presented at locality 1 (2 individuals). At locality1 there was also recorded 1 lamprey species Lampetra planeri in number of 3 individuals (1 adultand 2 ammocoete). DYK (1951) and DOBŠÍK et VEJMOLA (1953) confirmed the presence ofLampetra planeri also in the spring part of Moravice river. Based on the results of ichthyologicalsurveys (2004, 2012 a 2013) the abundance (individuals per hectare) and biomass (kg per hectare)was calculated for each species (Tab. 3). Opposite to 2004, population of Salmo trutta m. farioshows increase in abundance and biomass (except locality 1) at localities 1, 2, 3 and 5 in 2013.Abundance and biomass of Thymallus thymallus have also increased at localities 2 and 3 towards2013 opposite to 2004. The presence of Oncorhynchus mykiss is completely dependent on stocking.During ichthyological surveys 2012 and 2013 the presence of Cottus gobio at locality 3 was newlydetected. At localities 1 and 2 there was decrease of biomass of Cottus gobio in 2013 detectedcomparing to 2004. Abundance and biomass of population of Cottus poecilopus have decreased atlocalities 2, 3, 5 and 6 towards 2013 comparing to 2004.Tab. 3 Fish abundance and biomass in the years 2004, 2012 and 2013species/localityyearabundance/biomassA B A B A B A B A B A B A B A B A B A B A B A B A B A B A B A B A B A BSalmo trutta m. fario 200 16,6 311 ? 355 12,2 565 50,7 1648 ? 1064 66,3 476 74,4 3361 ? 3443 107,7 841 44,0 5192 ? 648 24,0 821 31,5 3796 ? 931 39,6 2363 134,2 2505 ? 425 12,3Thymallus thymallus 13 0,0 36,5 9,0 157 14,3 19 5,6 147 21,1Oncorhynchus mykiss 6,5 1,4 9 3,2 16 4,0Salvelinus fontinalisCottus gobioCottus poecilopus9,5 2,261 0,8 110 ? 76 0,4 289 2,8 179 ? 61 0,4 121 ? 171 2,0123 2,4 169 ? 557 0,6 217 3,2 220 ? 52 0,7 198 3,8 93 ? 98 1,5 298 2,4 559 ? 347 3,0 566 7,2 535 ? 242 2,7 1704 17,2 1143 ? 680 6,0Barbatula barbatula 10 0,1 43 0,5 122 2,8Rutilus rutilusPerca fluviatilsTotallocality 1 locality 22004 2012 20132004 2012 201325 0,4 429 16,0locality 32004 2012 201323,5 0,1414 21,2 590 0 1013 13 1150 66 2047 0 1343 85 1253 105 3575 0 3859 132 1139 46 5751 0 1011 31 1387 39 4331 0 1173 42 4090 152 3648 0 1105 18,3locality 42004 2012 2013locality 52004 2012 2013740 | P agelocality 62004 2012 2013Diversity index (the richness of species in community) was calculated according to Shanon andWeawer formula (1963). The diversity index was at locality 1: 1,144; locality 2: 0,733; locality 3:0,457; locality 4: 0,717; locality 5: 0,509; locality 6: 0,666. The highest community diversity wason locality 1 (4 fish species and 1 lamprey species). The lowest community diversity was at locality3 (4 fish species). The equitability (balance in community) was at locality 1: 0,71; locality 2: 0,45;locality 3: 0,33; locality 4: 0,65; locality 5: 0,73; locality 6: 0,96. According to equitability values