Speaking from his home in Iceland, Kristjan Loftsson also said Australia should resume hunting whales in order to prevent strandings and danger to shipping traffic.
"From the photos, it has all the characteristics of a Blue whale; given that - notably the coloration pattern - there is nearly no possibility that an experienced observer would have misidentified it as anything else at sea", said Dr. Phillip Clapham, NOAA Alaska Fisheries Science Centre.
Heart-breaking photos have emerged appearing to show that hunters in Iceland killing a rare blue whale, which are protected after they almost became extinct due to commercial whaling.
'From the photos, it has all the characteristics of a blue whale; given that - notably the coloration pattern - there is nearly no possibility that an experienced observer would have misidentified it as anything else at sea'.
"Photographs point to the fact that it's a hybrid whale and we're nearly certain that it is one, but we can't be sure until autumn when we get it DNA tested", he said, according to ABC News.More news: Barcelona complete €36m Lenglet capture from Sevilla
Experts believe the whale could be a blue whale-fin whale hybrid.
Animal rights campaigners who photographed the whale's carcass, say it was harpooned and killed off the west coast of Iceland on 8 July.
Mr Loftsson said his crew spent an hour observing the whale before shooting it, and that they have never mistakenly taken a blue whale.
It is the 22nd endangered whale killed and butchered for export to Japan by commercial whaling company Hvalur hf at its station in Hvalfjordur since June 20 this year, Sea Shepherd reports.
Anti-whaling activist group Sea Shepherd has claimed a whaling company in Iceland killed an endangered blue whale.More news: Tesla customers will start losing a $7500 tax credit in 2019
"This is a deplorable act - the blue whale, the largest animal ever to grace our planet - is endangered and protected under all relevant worldwide agreements", he said.
During this year's season, Sea Shepherd said Hvalur hf had killed 22 whales.
Sea Shepherd UK's Chief Operating officer Robert Read demanded that DNA samples should be taken from from all the whale meat and parts in storage at Loftsson's whaling station and warehouses.
"The killing of such a majestic creature, blue whale or hybrid, represents a significant crime against nature, given the rarity of these species and the threats to their survival today".
"Iceland's whaling is rogue and archaic and should command diplomatic criticism at the highest levels".More news: Netflix knocks HBO off its throne, as Emmy voters spread the wealth
Since then, the significant weight of expert opinion, including CEO of The Blue Whale Study Dr Peter Gill, have agreed that the animal is most likely a blue whale, with a very small chance it may be a hybrid. "We see them in the ocean".