Tomalley
Encyclopedia
Body cavity
By the broadest definition, a body cavity is any fluid-filled space in a multicellular organism. However, the term usually refers to the space located between an animal’s outer covering and the outer lining of the gut cavity, where internal organs develop...
of lobster
Lobster
Clawed lobsters comprise a family of large marine crustaceans. Highly prized as seafood, lobsters are economically important, and are often one of the most profitable commodities in coastal areas they populate.Though several groups of crustaceans are known as lobsters, the clawed lobsters are most...
s, that fulfills the functions of both the liver
Liver
The liver is a vital organ present in vertebrates and some other animals. It has a wide range of functions, including detoxification, protein synthesis, and production of biochemicals necessary for digestion...
and the pancreas
Pancreas
The pancreas is a gland organ in the digestive and endocrine system of vertebrates. It is both an endocrine gland producing several important hormones, including insulin, glucagon, and somatostatin, as well as a digestive organ, secreting pancreatic juice containing digestive enzymes that assist...
. Tomalley corresponds to the hepatopancreas
Hepatopancreas
The hepatopancreas, digestive gland or midgut gland is an organ of the digestive tract of arthropods, molluscs and fish. It provides the functions which in mammals are provided separately by the liver and pancreas, including the production of digestive enzymes, and absorption of digested...
in other arthropods. It is considered a delicacy, and may be eaten alone but is often added to sauce
Sauce
In cooking, a sauce is liquid, creaming or semi-solid food served on or used in preparing other foods. Sauces are not normally consumed by themselves; they add flavor, moisture, and visual appeal to another dish. Sauce is a French word taken from the Latin salsus, meaning salted...
s for flavour and as a thickening agent. The term lobster paste or lobster pâté
Pâté
Pâté is a mixture of ground meat and fat minced into a spreadable paste. Common additions include vegetables, herbs, spices, and either wine or cognac, armagnac or brandy...
can also be used to indicate a mixture of tomalley and lobster roe
Roe
Roe or hard roe is the fully ripe internal egg masses in the ovaries, or the released external egg masses of fish and certain marine animals, such as shrimp, scallop and sea urchins...
. Lobster bisque
Bisque
Bisque may refer to:* Bisque , a piece of unglazed pottery* Bisque , a thick, creamy soup made from puréed seafood or vegetables* Bisque, a free turn in a handicap croquet match* Bisque, a free point in a handicap real tennis match...
, lobster stock
Stock (food)
Stock is a flavoured water preparation. It forms the basis of many dishes, particularly soups and sauces.- Preparation :Stock is made by simmering various ingredients in water, including some or all of the following...
, and lobster consommé
Consommé
In cooking, a consommé is a type of clear soup made from richly flavored stock or bouillon that has been clarified usually through a fining process involving egg protein. It usually requires an advanced knowledge of cooking and past experience to create a high quality consommé...
are made using lobster bodies (heads), often including the lobster liver.
The hepatopancreas of a crab
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...
is also called tomalley; in crabs the tomalley is yellow or yellow-green in colour. In Maryland and on the Delmarva Peninsula
Delmarva Peninsula
The Delmarva Peninsula is a large peninsula on the East Coast of the United States, occupied by most of Delaware and portions of Maryland and Virginia...
, the hepatopancreas of the blue crab is called the "muster" or "mustard", probably because of the yellow colour, which is not the bright yellow of regular prepared yellow mustard, but closer to one of the brown mustards, such as Dijon mustard. Particularly when eating steamed or boiled crabs, it is considered a delicacy.
The tomalley in general can be consumed in moderation (as with the livers of other animals). It can, however, contain high levels of PCBs which can give a number of negative health effects in large concentrations. It may also contain toxins that are associated with paralytic shellfish poisoning
Paralytic shellfish poisoning
Paralytic shellfish poisoning is one of the four recognized syndromes of shellfish poisoning, which share some common features and are primarily associated with bivalve mollusks . These shellfish are filter feeders and, therefore, accumulate toxins produced by microscopic algae, such as...
(saxitoxin
Saxitoxin
Saxitoxin is a neurotoxin naturally produced by certain species of marine dinoflagellates and cyanobacteria Saxitoxin (STX) is a neurotoxin naturally produced by certain species of marine dinoflagellates (Alexandrium sp., Gymnodinium sp., Pyrodinium sp.) and cyanobacteria Saxitoxin (STX) is a...
and gonyautoxin). Those toxins do not leach out when the lobster is cooked in boiling water. The toxins responsible for most shellfish poisonings are water-insoluble, heat and acid-stable, and thus are not diminished by cooking.
A report from the Maine Department of Marine Resources in July 2008 indicated the presence of high levels of paralytic shellfish poisoning toxin in some tomalley from lobsters in that state. Around the same time, The Massachusetts Department of Public Health reminded consumers not to eat lobster tomalley, because this part of the lobster can build up high levels of toxins and other pollutants. The U.S. Food and Drug Administration then issued an advisory against consuming tomalley from American lobster
American lobster
The American lobster, Homarus americanus, is a species of lobster found on the Atlantic coast of North America, chiefly from Labrador to New Jersey. Within North America, it is also known as the northern lobster or Maine lobster. It can reach a body length of , and a mass of over , making it the...
found anywhere in the Atlantic Ocean. But in the same advisory the FDA stated that lobster tomalley "normally does not contain dangerous levels of PSP toxins" and that the current high toxin levels were probably "associated with an ongoing red tide
Red tide
Red tide is a common name for a phenomenon also known as an algal bloom , an event in which estuarine, marine, or fresh water algae accumulate rapidly in the water column and results in discoloration of the surface water. It is usually found in coastal areas...
episode in northern New England and eastern Canada".