Could the Green Material Be a Parasite?
The appearance can certainly make people wonder about parasites.
However, the green mass shown in this type of photograph is generally consistent with normal lobster anatomy, specifically the hepatopancreas.
It isn't appropriate to diagnose a parasite simply from a photograph.
Parasites, infections, and other abnormalities can have very different appearances, and identifying them accurately may require examination by someone with appropriate biological or veterinary expertise.
So if you open a lobster and see a green substance inside the body, the first assumption shouldn't be:
“There's a parasite inside.”
A normal anatomical explanation is much more likely.
What About the Lobster's Eggs?
Another internal substance people sometimes confuse with tomalley is lobster roe.
Roe consists of eggs and is typically associated with the female lobster.
Depending on their developmental stage, lobster eggs can have different colors, including darker or reddish-orange shades.
Tomalley, by contrast, is generally the greenish or yellow-green organ located within the body cavity.
The two are completely different structures.
This is another reason why looking at the entire lobster rather than focusing on a single unusual color is important.
Why Does Tomalley Sometimes Look Almost Like Green Paste?
The texture shown in the photograph can be surprising because tomalley doesn't look like a conventional organ.
It can have a soft, paste-like consistency.
That's partly because the hepatopancreas is composed of specialized tissues involved in digestion, nutrient absorption, storage, and metabolism.
When the lobster is opened, the organ can spread across the internal cavity, making it look much larger or stranger than people expect.
This is especially noticeable when the lobster is photographed close-up.
A normal anatomical structure can suddenly look extremely unusual when enlarged in a high-resolution photograph.
That's one reason images like this tend to generate so many reactions online.