The seizure of wildlife products has more than doubled from 2011 to 2015, with shells, seahorses, corals and butterflies among the items being seized at the country's borders.
Figures from the Department of Conservation showed the number of seizures were up from 2,268 in 2011 to 5,809 in 2015.
Over the four years from 2007 to 2011, 13,000 wildlife seizures were reported in total. This cumulative figure rose to 19,221 for the next four-year period ending in 2015.
Environmental policy analyst Fiona Gordon said despite the high rates of seizures no-one was fined in the four years to 2015, and there were only eight prosecutions under New Zealand's Trade in Endangered Species Act.
The Government has introduced a bill into Parliament earlier this year, that if passed would create a system for infringements.