Behavioural response of carp (Cyprinus carpio, L.) pond stock upon occurrence of hunting great cormorant (Phalacrocorax carbo sinensis) flocks

2010 ◽  
Vol 19 (1) ◽  
pp. 121-129 ◽  
Author(s):  
Jiří Kortan ◽  
Zdeněk Adámek
Keyword(s):  
Cyprinus Carpio ◽  
Behavioural Response ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis ◽  
Carp Cyprinus Carpio

Stress responses of carp pond fish stock upon hunting activities of the great cormorant(Phalacrocorax carbo sinensis L.)

2010 ◽  
Vol 42 (3) ◽  
pp. 322-330 ◽  
Author(s):  
Jiri Kortan ◽  
Jana Blahova ◽  
Kamila Kruzikova ◽  
Zdenek Adamek
Keyword(s):  
Stress Responses ◽  
Fish Stock ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis

scholarly journals Estimating the mortality caused by great cormorant predation on fish stocks: pikeperch in the Archipelago Sea, northern Baltic Sea, as an example

2016 ◽  
Vol 73 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Outi Heikinheimo ◽  
Pekka Rusanen ◽  
Katja Korhonen
Keyword(s):  
Age Groups ◽  
Total Mortality ◽  
Sensitivity Analyses ◽  
Fish Stock ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Fish Stocks ◽  
Archipelago Sea ◽  
Phalacrocorax Carbo Sinensis ◽  
The Impact

Estimates of the mortality rates caused by cormorants are needed to assess the impact on fish stock dynamics and fisheries. In this study, we calculated the annual instantaneous mortality caused by great cormorants (Phalacrocorax carbo sinensis) on young pikeperch (Sander lucioperca), using data from Archipelago Sea, southwestern coast of Finland. The pikeperch are vulnerable to cormorant predation mainly at the ages 2–4. The annual instantaneous mortality caused by cormorants was between 0.04 and 0.13, and the estimated effect on the pikeperch stock size at recruitment to the fishery ranged from 4% to 23%, respectively. The average annual cormorant-induced mortality accounted for 5%–34% of the total mortality in these age groups. The sensitivity analyses proved that the rates of mortality from other sources largely affect the estimated mortality from cormorant predation. In cases with strong fluctuations in the abundance of the prey fish stocks, ignoring the size and density dependence of the natural mortality may lead to overestimation of the importance of cormorants as competitors of fisheries.

scholarly journals Prey detection by great cormorant (Phalacrocorax carbo sinensis) in clear and in turbid water

2008 ◽  
Vol 211 (6) ◽  
pp. 866-872 ◽  
Author(s):  
T. Strod ◽  
I. Izhaki ◽  
Z. Arad ◽  
G. Katzir
Keyword(s):  
Great Cormorant ◽  
Prey Detection ◽  
Turbid Water ◽  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis
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