The president of Poland's Fish Producers Association, Marek Trzcieliński, has called on fish farmers to ensure that carp, a traditional Christmas dish in Poland, is sold at a price that covers the increased production costs this year. The cost of carp production has risen between PLN 11 to PLN 15 per 1 kg, depending on the region. Trzcieliński has urged farmers to maintain fair selling prices to prevent a deteriorating economic situation for producers.