Great cormorant (Phalacrocorax carbo sinensis) occurrence in carp aquacultural ponds: a case study from the South Bohemia (Czech Republic) pond region

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F22%3A43904573" target="_blank" >RIV/60076658:12520/22:43904573 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s10499-022-00917-4" target="_blank" >https://doi.org/10.1007/s10499-022-00917-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10499-022-00917-4" target="_blank" >10.1007/s10499-022-00917-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Great cormorant (Phalacrocorax carbo sinensis) occurrence in carp aquacultural ponds: a case study from the South Bohemia (Czech Republic) pond region

Popis výsledku v původním jazyce

The impact of piscivorous predatory species is an important factor negatively influencing the prosperity of inland aquacultural facilities. In this regard, carp (Cyprinus carpio) pond stocks suffer predation pressure from both migrating and nesting great cormorant (Phalacrocorax carbo sinensis) populations, which utilise easily available fish prey cultured in carp ponds at densities incomparably higher than found in natural water bodies. Previous studies dealing with conflicts between cormorants and inland fisheries have usually focused on direct and/or indirect effects of cormorant predation, or descriptions of total size, long-term trends, and movements/dispersal of European populations. Though the results gained through comprehensive pan-European projects are valuable and usually applicable at larger scales, more detailed case studies from carp pond regions can provide a different viewpoint on such issues. In this case study from the Trebon pond region in the Czech Republic, we examine cormorant count data from 2019 (whole year), performed by fish farmers as a requirement for compensation of losses caused by cormorant predation, and examine them in relation to variables such as pond size and distance from breeding colony, along with economic (financial) aspects of cormorant predation. The total whole-year count was the highest at larger ponds (&gt; 50 ha), where more than 5,000 cormorants per day (corm/day) were recorded, with highest figures exceeding 7-9,000 corm/day at ponds &gt; 150 ha. Maximum daily cormorant counts during the spring and autumn peaks reached up to 450 birds at the largest ponds (&gt;= 200 ha), though the highest daily per ha abundance was recorded at smaller ponds (&lt; 20 ha), with maxima exceeding 20 corm/ha. The highest counts were recorded during the spring and autumn flyway migrations, with a smaller summer peak also noticeable as young birds left the nests. This &quot;young-bird&quot; peak was most pronounced at &lt; 50 ha ponds situated &lt;= 10 km from the colony. Predation pressure per ha of pond was clearly highest at &lt; 5 ha ponds, with levels decreasing with increasing pond size. Financial losses at smaller ponds were further increased due to the higher price of young fish cultured in small (&lt; 5 ha) nursing ponds.

Název v anglickém jazyce

Great cormorant (Phalacrocorax carbo sinensis) occurrence in carp aquacultural ponds: a case study from the South Bohemia (Czech Republic) pond region

Popis výsledku anglicky

The impact of piscivorous predatory species is an important factor negatively influencing the prosperity of inland aquacultural facilities. In this regard, carp (Cyprinus carpio) pond stocks suffer predation pressure from both migrating and nesting great cormorant (Phalacrocorax carbo sinensis) populations, which utilise easily available fish prey cultured in carp ponds at densities incomparably higher than found in natural water bodies. Previous studies dealing with conflicts between cormorants and inland fisheries have usually focused on direct and/or indirect effects of cormorant predation, or descriptions of total size, long-term trends, and movements/dispersal of European populations. Though the results gained through comprehensive pan-European projects are valuable and usually applicable at larger scales, more detailed case studies from carp pond regions can provide a different viewpoint on such issues. In this case study from the Trebon pond region in the Czech Republic, we examine cormorant count data from 2019 (whole year), performed by fish farmers as a requirement for compensation of losses caused by cormorant predation, and examine them in relation to variables such as pond size and distance from breeding colony, along with economic (financial) aspects of cormorant predation. The total whole-year count was the highest at larger ponds (&gt; 50 ha), where more than 5,000 cormorants per day (corm/day) were recorded, with highest figures exceeding 7-9,000 corm/day at ponds &gt; 150 ha. Maximum daily cormorant counts during the spring and autumn peaks reached up to 450 birds at the largest ponds (&gt;= 200 ha), though the highest daily per ha abundance was recorded at smaller ponds (&lt; 20 ha), with maxima exceeding 20 corm/ha. The highest counts were recorded during the spring and autumn flyway migrations, with a smaller summer peak also noticeable as young birds left the nests. This &quot;young-bird&quot; peak was most pronounced at &lt; 50 ha ponds situated &lt;= 10 km from the colony. Predation pressure per ha of pond was clearly highest at &lt; 5 ha ponds, with levels decreasing with increasing pond size. Financial losses at smaller ponds were further increased due to the higher price of young fish cultured in small (&lt; 5 ha) nursing ponds.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10613 - Zoology

Projekt

<a href="/cs/project/QK1920102" target="_blank" >QK1920102: Automatizace a objektivizace monitoringu rybožravých predátorů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Aquaculture International

ISSN

0967-6120

e-ISSN

1573-143X

Svazek periodika

30

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

2541-2556

Kód UT WoS článku

000819311700001

EID výsledku v databázi Scopus

2-s2.0-85133194449