Increased foraging activity increases vulnerability of fish to angling. Foraging activity of free-ranging common-carp (Cyprinus carpio L.) is assumed to be mostly nocturnal. Thus, it is assumed that the number of carp caught in angling competitions will be higher during the night than during the day. Also, common carp are able to learn the position of new feeding spots that they exploit repeatedly. This ability may lead to an increase in number of landed carp each consecutive day of angling competitions as new carp learn the position of newly established feeding-spots. These hypotheses were tested using data from 14 carp-oriented angling competitions conducted in four European countries. As expected, carp landings were most frequent at night and the number of carp landed increased non-monotonously throughout the competitions. These findings may be important for essential feeding biology of wild common carp with valuable implications for anglers and management of non-native carp.

觅食活动的增加增加了鱼类对钓鱼的脆弱性。自由放养鲤鱼（Cyprinus carpio ）的觅食活动L.) 被认为主要是夜间活动。因此，假设在钓鱼比赛中捕获的鲤鱼数量在夜间会比白天多。此外，鲤鱼能够了解它们反复利用的新觅食点的位置。随着新鲤鱼了解新建立的觅食点的位置，这种能力可能会导致在钓鱼比赛中连续每天增加上岸鲤鱼的数量。使用在四个欧洲国家进行的 14 场以鲤鱼为导向的垂钓比赛的数据对这些假设进行了测试。正如预期的那样，鲤鱼上岸在夜间最为频繁，并且在整个比赛中上岸的鲤鱼数量非单调增加。这些发现可能对野生鲤鱼的基本饲养生物学很重要，对垂钓者和非本地鲤鱼的管理具有重要意义。