Winter Feeding of the Common Cormorant (Phalacrocorax carbo hanedae) in a Temperate River System in Japan

Abstract

In Japan, the numbers of common cormorants (Phalacrocorax carbo hanedae) feeding in inland waters have shown a rapid increase since the 1980s, which has resulted in concerns of predation impacts on inland fisheries. We had an opportunity to examine stomach contents of cormorants in an inland area during winter, [2007][2008]. Of the 23 cormorants examined, 19 had fish in their stomachs. The mean wet weight of identifiable prey fish in stomachs (129.3 g) amounted to 25.7 % of the daily food requirement of the cormorants. Of the four fish species found in the stomachs of the cormorants, pale chub (Zacco platypus) and Japanese dace (Tribolodon hakonensis), school-forming species,

Tilapia Stock Suppression by the Great Cormorant (<i>Phalacrocorax carbo</i>) in Lake Kinneret, Israel

“…The conflict between Cormorants and fisheries, especially when integrated into lake management design, is a wide internationally known issue. Cormorant damages to fishery and lake management are drastic not only in Europe but in other parts of the world as well [1] [2]. The Cormorant population in Europe has increased during the last 25 years due to the implementation of endangered birds' protection policy adopted by the European Economic Community (EEC).…”