On Saturday, a humpback whale was being monitored at Seal Rocks, south of Forster on the mid-north coast, after becoming snared by ropes and five buoys.
Further north at Ballina, a juvenile whale was detected in the Richmond River on Sunday, also being hampered by buoys and netting around its body.
Marine rescuers were unable to disentangle the whales before losing sight of them.
In a strange twist of fortunes, incidents like these entanglements are a reflection of a healthy and increasing whale population using the "humpback highway" along the Australian east coast each year.
Organisation for the Rescue and Research of Cetaceans in Australia (ORRCA) second vice-president, Jools Farrell, said we could expect to see more entanglements.
"Because the population is increasing we will, unfortunately, see more situations of whales becoming entangled," she said.
The 2019 whale migration started in April this year, and promised to be one of the "busiest yet".
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