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When a 100-pound shipment of聽lobsters聽arrived at Bill Sarro's seafood shop and restaurant last month, it contained a surprise 鈥� six orange crustaceans that have been said to be a 1-in-10-million oddity.

"My butcher was unloading them and said, 'Oh, my gosh, boss, they sent us cooked dead聽lobsters,'" said Sarro, owner of Fresh Catch Seafood in Mansfield, Mass. "He then picked one up and it crawled up his arm."

Reports of odd-colored聽lobsters聽used to be rare in the聽lobster聽fishing grounds of New England and Atlantic Canada. Normal lobsters聽are a mottled greenish-brown.

But in recent years, accounts of bright blue, orange, yellow, calico, white and even split聽lobsters聽鈥� one color on one side, another on the other 鈥� have jumped. It's now common to hear several stories a month of a lobsterman bringing one of the quirky crustaceans to shore.

It's anybody's guess why more oddities are popping up in聽lobster聽traps, said Michael Tlusty, research director at the New England Aquarium in Boston.

It could be simply because advances in technology 鈥� cellphone cameras and social media 鈥� make it easier to spread the word about bizarre聽lobster聽sightings.

It's also likely more weird聽lobsters聽are being caught because the overall harvest has soared. In Maine, the catch has grown fourfold in the past 20 years, to nearly 105 million pounds last year. If the yield has quadrupled, it would make sense to have four times as many unconventional聽lobsters聽being caught as well.

Although聽lobster聽is the No. 1 commercial fishery in the Northeast, there are a lot of unanswered questions about the bottom-dwelling creatures, he said.

"Are we seeing more because the Twitter sphere is active and people get excited about colorful聽lobsters?" Tlusty said. "Is it because we're actually seeing an upswing in them? Is it just that we're catching more聽lobsters聽so we have the opportunity to see more?

"Right now you can make a lot of explanations, but the actual data to find them out just isn't there."

Lobsters聽come in a variety of colors because of genetic variations.

It's been written that the odds of catching a blue聽lobster聽are 1-in-2 million, while orange comes in at 1-in-10 million. Yellow and orange-and-black calico聽lobsters聽have been pegged at 1-in-30 million, split-colored varieties at 1-in-50 million, and white 鈥� the rarest of all 鈥� at 1-in-100 million.

But those are merely guesses, and nobody knows for sure.

What is known is that colored聽lobsters聽have shown up in greater frequency in certain areas over the years.

The waters off Cutler in eastern Maine were once a hotbed for blue ones, after 1,500 larvae-sized blue聽lobsters聽were released in 1990 to use as a tracking tool to determine their survival rates, said Bob Bayer, executive director of the University of Maine'蝉听尝辞产蝉迟别谤听滨苍蝉迟颈迟耻迟别.

The waters off Montauk, N.Y., once had a lot of blue聽lobsters聽as well, he said, after researchers released large numbers of blue聽lobsters聽there. The bright-orange聽lobsters聽that were in Sarro's shipment are believed to have come from the same waters in Canada.

Aside from their color, the聽lobsters聽are apparently normal in all other ways, Bayer said. They all turn red when they're cooked, except for the white ones since they don't have any pigment, and diners wouldn't notice a difference.

"There's no difference in taste," he said.

Scientists say it's possible the聽lobster聽population as a whole has a greater percentage of misfits than it did in years past.

The off-colored聽lobsters聽are more susceptible to predators because they stick out more on the ocean bottom, rather than blending in like normal ones, said Diane Cowan, executive director of The聽Lobster聽Conservancy in Friendship, Maine.

"But with the predator population down, notably cod, there might be greater survival rates among these color morphs that are visually easier to pick out," she said.

Lobstermen have brought Cowan countless colorful聽lobsters聽over the years. The prettiest one, she said, was pink and purple.