The serial monk seal killings on Molokai and Kauai have prompted the creation of a confidential reward tip line.
On Wednesday, the Humane Society of the United States (HSUS) and DLNR announced a new effort to stop poaching and wildlife crimes in the islands.
Hawaiian monk seals are one of the world's most endangered animals.
They are endemic to Hawaii -- where only about 1,100 seals remain.
But four monk seals have been slaughtered recently, three on Molokai and one on Kauai.
"I'm sure somebody knows something out there. And we're hoping that they would provide the information so that we can number one, stop this kind of behavior. Number two, use it as part of the educational process moving forward," said William Aila, Jr., state DLNR chairperson.
Anyone who calls the tip line with information that leads to the arrest and conviction of those involved in the monk seal killings is eligible for a $30,000 reward or $10,000 per seal.
The reward money comes from the HSUS, the Conservation Council for Hawaii, the Center for Biological Diversity, the Marine Conservation Institute and a local anonymous donor.
"It's very important, obviously, that we get the community involved in these issues. There's a lot of concern, especially in light of the recent, tragic monk seal killing," said Inga Gibson, Hawaii state director for HSUS.
The agencies hope the tip line will serve as a deterrent for future wildlife-related crimes.
"We also hope it would prompt someone that may have committed these acts to turn themselves in, to come forward," Gibson said.
The toll-free, confidential reward tip line number is: 1-855-DLNR-TIP.
The line serves for specific, designated cases only that are under investigation.
Details of other pending reward cases will be posted on the DLNR and HSUS websites.
Anyone convicted of harassing or killing a monk seal faces up to five years in prison and/or a $50,000 fine.