CONTENTS 



Page 



Introduction 1 



Biology 



Classification 1 



Description 2 



Distribution 2 



Environment 4 



Relative abundance 5 



Reproduction 5 



Age and growth 8 



Mortality 9 



Associated organisms 10 



Behavior 10 



Fishery 



General 12 



North Carolina 15 



Florida east coast 15 



Northeastern Gulf of Mexico 16 



Summary 16 



Literature cited 17 



Figures 



No. Page 



1. Calico scallop, showing left valve (top) and right valve (bottom) 2 



2. General distribution of the calico scallop is shown by the stippled area 3 



3. Relative abundance of the calico scallop, Cape Kennedy grounds, 1960-1966. One 



fathom equals 1.8 m 6 



4. Spawn, ejected by the calico scallop on the left, appears as a milky cloud 7 



5. A spat trap is a nylon mesh bag (top) containing unlaid polyethylene line (bottom 



right). Young scallops enter the bag as larvae, grow, and are permanently 

 trapped when their size (center) exceeds that of the mesh opening. Spat traps 

 are used to monitor spawning success by season and area 8 



6. Animals associated with calico scallops on the Cape Kennedy grounds, Florida, include 



shrimp, crabs, gastropod and bivalve mollusks, starfish, brittle stars, sea urchins, 



sand dollars, and fish H 



7. Juvenile calico scallops swimming in aquarium 12 



8. Locations of calico scallop fishing grounds (wavy lines) and cities referred to in text 



(numerals) 13 



9. A factory-type scalloper, with sorting and shucking machinery mounted on deck 14 



Table 



No. 

 1. Annual production and value of calico scallops, southeastern United States 1959-1970 . 13 



iii 



