Ahmed Gadaf, who says he's a spokesman for the pirates, says Western fishing vessels "harass" local fishermen and destroy their nets. Gadaf spoke to The Associated Press by satellite phone.
Gadaf says the British couple, Paul and Rachel Chandler, are safe and will not be harmed.
Illegal fishing off the coast of Somalia stirs strong passions in the country. The country's prime minister, Omar Abdirashid Ali Sharmarke, said in a speech last week that many countries are fishing illegally in Somali waters and have pushed formerly profitable Somali fishermen into the pirate trade.