Mother of baby-boom orca dies after months of weight loss

The U.S.'s Centerfor Whale Research says an iconic orca named J28 has died after months of losing weight, which could also bring about the death of her latest offspring, J54, who was born in late 2015.

On Friday, the centre announced the death, which comes less than a year after the two cetaceans were celebrated as being part of eight calves born in 2015.

It was ababy boom for the animals andscientists said at the time it had put the population of endangered southern residents, "back within its normal birth rate."

• Toxins may have caused male killer whale baby boom, says researcher
• Southern resident orca matriarch missing, possibly dead
• Southern resident killer whales to get personalized health records

Since her birth in 1992 or 1993, J28 was easy to spotin the inshore waters of the Pacific Northwest, due to a nick on her dorsal fin.

VIDEO | Center for Whale Research news conference announces death of J28:

The centre has not been able to recover J28's carcassbut hopes to in order to determine the cause of her death and the number of pregnancies she's had in her lifetime.

"J28 was noted to be losing body condition in January 2016, presumably from birthing complications and by July was clearly emaciated," said the centre in a news release. The centre also said it believes the animal died in the Strait of Juan de Fuca sometime between Oct.16 and Oct.18.

J28 gave birth to J46 in 2009but lost a baby in 2013.

The centre says that due to J28's death, J54 will most likely not survive because he needs his mother's milk to survive and has gone too long with inadequate nutrition.

J28 is survived by her mother, (J17) two sisters (J35 and J53), a brother (J44), a daughter (J46)and a nephew (J47).

Sistertrying to save J54

"Her daughter and her oldest sister (J35) are attempting to care for the orphaned calf," said the centre in a statement.

"His sister, J46, had been catching and offering salmon to her mother and little brother for several months while mom was ill,but that was simply not enough nutrition provided to three whales by one little female, no matter how hard she tried."

The centre says the pod is now reduced in size to 80 animals, down from 85 in January, 2016.

At anews conference announcingthe death, the Center for Whale Research asked for changes to dams it says arekeeping chinook salmon from getting into the feeding grounds of southern resident killer whales.