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FISHERIES

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FISH and WILDLIFE SERVICE
United States Department of the Interior

Washington, D.C.

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2- پامال

FREEZING AND STORING DEEP-SEA LOBSTERS--
SOME TESTS ON COOKED WHOLE LOBSTERS

By Joseph W. Slavin* and John A. Peters**

2 2449 88134 97

ABSTRACT

IT WAS FOUND THAT DEEP-SEA LOBSTERS, COOKED ALIVE AND THEN FROZEN IN A
BLAST-AIR FREEZER OR IN AN IMMERSION FREEZER (IN A GLUCOSE -SALT SOLUTION),
COULD BE KEPT SATISFACTORILY IN FROZEN STORAGE FOR 2 TO 4 WEEKS.

BECAUSE OF THE LIMITED FROZEN SHELF LIFE OF THE DEEP-SEA LOBSTER, IT
WOULD NOT BE FEASIBLE TO MARKET FROZEN WHOLE LOBSTERS IN THE NORMAL CHÁIN OF
DISTRIBUTION. IT WOULD BE POSSIBLE, HOWEVER, TO FREEZE THEM AT SEA AND THEN
DISTRIBUTE THEM TO LOBSTER PRODUCERŚ OR TO RESTAURANTS WHERE A RAPID TURN-
OVER OCCURS. THE USE OF A BLAST OR IMMERSION FREEZER IS DISCUSSED, AND REC-
OMMENDATIONS ARE GIVEN FOR SELECTING A FREEZING SYSTEM TO HANDLE LOBSTERS ON
A VESSEL.

INTRODUCTION

Because of the problems in keeping deep-sea lobsters alive aboard commercial fishing trawlers, the lobster resource found off the coast of Massachusetts by the U. S. Bureau of Commercial Fisheries research vessel Delaware has not been adequately exploited. Accordingly, information on a satisfactory method of preserving lobsters at sea would contribute to greater utilization of this fishery.

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Keeping deep-sea lobsters alive aboard commercial fishing vessels presents the following problems: (1) the high cost of equipping the vessel with the tanks and pumps necessary to provide the required storage space and sea-water circulation and (2) the high mortality rate of lobsters at certain times of the year in spite of precautions taken to outfit the vessel properly.

Possible solution to these problems would be to freeze the cookedl/ whole lobsters aboard the vessel in either a blast or immersion freezer, since this equipment is well suited for freezing irregularly shaped products and can easily be installed on a

FIG. 1 - LOWERING THE BASKET OF LOBSTERS INTO THE fishing vessel. Information on the

FREEZING SOLUTION. storage life of cooked, frozen, whole lobsters is also necessary in order to enable industry to decide if it would be feasible to market these lobsters. *REFRIGERATION ENGINEER, FISHERY TECHNOLOGICAL LABORATORY, DIVISION OF INDUSTRIAL RESEARCH

} ** CHEMIST

AND SERVICES, U. S. BUREAU OF COMMERCIAL FISHERIES, EAST BOSTON, MASS. 1/EARLIER TESTS ON FROZEN LOBSTERS (POTT INGÉR 1950) SHOWED THAT WHEN WHOLE FROZEN UNCOOKED LOBSTERS

WERE COOKED, THE MEAT STUCK VERY TIGHTLY TO THE SHELL AND WAS EXTREMELY DIFFICULT TO REMOVE, IN THE PRESENT EXPERIMENT. THE LOBSTERS THEREFORE WERE COOKED PRIOR TO FREEZING.

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