The Fisheries Agency has requested 100 million yen ($910,000) in the national budget for a study into the future of commercial whaling, an agency official told AFP, including the fate of the 30-year-old Nisshin Maru, the lead vessel of Japan's whaling flotilla.
"That study will include discussions on what to do with the Nisshin Maru -- if its life should be extended (by repairs), or should be replaced with a used ship or a new ship, among other ideas," according to the agency's Takato Maki.
He said Japan has no plans to change its policy of staging an annual "research" hunt to prepare for a eventual return to commercial whaling.
Japan is a signatory to the International Whaling Commission's moratorium on hunting, but exploits a loophole that allows whales to be killed in the name of scientific research.
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Tokyo says lethal research is necessary for in-depth knowledge of whale behaviour and biology, but it makes no secret of the fact that whales killed in the hunts often end up on dinner plates.
Japan cancelled its 2014-15 hunt, only to resume it the following season under a new programme that it said now had genuine scientific value.
In December, the European Union and 12 other nations condemned Japan's Antarctic whaling programme.
Tokyo says it is trying to prove the whale population is large enough to sustain a return to commercial hunting for a traditional source of food.
In the latest mission, five Japanese vessels including the Nisshin Maru left port in November for the four-month expedition, expecting to kill 333 minke whales.
Japan's mass-circulation Yomiuri daily said last week the fisheries agency was planning to buy a new ship or refit one in part to help its whalers evade anti-whaling activists at sea.