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Plan of the Powder Hole, Monomoy Point, Mass., showing the shellfish experiments and laboratory of the
1. Plan of the Powder Hole, Monomoy Point, Mass., showing the shellfish experiments and laboratory of the Massachusetts Department of Fisheries and Game. The harbor, represented by the dotted lines, is bounded on the north and west by a clam flat of coarse sand. The channel connecting the Powder Hole with the ocean passes across this flat. The deepest water, 18 feet, is found near the clam flat, while in the eastern and southern parts of the harbor the shallow water is filled with a thick growth of eelgrass.
(1) Raft; (2) car in which egg lobsters were confined for hatching purposes; (3) scallop pen; (4) scallop pen; (5) scllop pen; (6) winter rack for suspending scallop baskets and quahaug boxes under water as a protection from the ice; (7) quahaug bed No.3; (8) quahaug bed no.5; (9) quahaug bed no. 7; (10) quahaug bed No.6; (11) quahaug bed No.8; (12) clam bed No.19; (13) sea clam bed; (14) clam bed No.18; (15) clam bed No.3; (16) clam bed No. 2; (17) clam bed No. 99; (18) clam bed N
Quahaugs from an experimental bed at Monomoy Point, showing two years' growth. The two notches or file
2. Quahaugs from an experimental bed at Monomoy Point, showing two years' growth. The two notches or file marks on the shells indicate the growth per year.... These quahaugs show rapid growth, having gained nearly 1 inch in length per year.
One of the boxes suspended from the raft at Monomoy Point when taken up at the end of the summer. The
3. One of the boxes suspended from the raft at Monomoy Point when taken up at the end of the summer. The quahaugs which have been growing in the box are shown in front. On careful examination the notches in the shaft, marking growth for three years, can be seen. The box and rope are covered with barnacles and silver shells (Anomia), while the wood has been perforated by a boring mollusk, the ship-worm (Toredo). This illustrates an easy method of obtaining the rate of growth of the quahaug.
Growth of a quahaug in the raft boxes, Monomoy Point, from one and one-half to five and one-half years
4. Growth of a quahaug in the raft boxes, Monomoy Point, from one and one-half to five and one-half years old, is shown with the corresponding increase in volume. Starting with 1 bushel of one and one-half-year-old quahaugs, there would result at the age of five and one-half years approximately 19 bushels. The figures on the left give the size of the quahaug...; those on the right represent the volume in bushels corresponding to the various years.
Spat boxes, lowered from the raft at Monomoy Point, after having been down for the summer. Notice the
5. Spat boxes, lowered from the raft at Monomoy Point, after having been down for the summer. Notice the quantity of barnacles and silver shells (Anomia) which have collected on the outside. Inside, these boxes heavy sets of clams and quahaugs were obtained, while on the outside were found numbers of young scallops, which were removed before the photograph was taken
Plan of biological raft used at Monomoy Point for growth experiments and spat collecting. The raft, 20
6. Plan of biological raft used at Monomoy Point for growth experiments and spat collecting. The raft, 20 feet long by 10 feet wide, provided with a central well and four trap-doors, was anchored to the Powder Hole in 20 feet of water. Wire cages and wooden boxes were suspended at various depths from the raft. Many kinds of mollusks were caught and raised in these spat boxes. The raft proved particularly useful in the study of the post-embryonic life history, as the scallops 'set' in large numbers on the boxes, cages and ropes, where specimens could be obtained in all stages of development for laboratory examination. Also, many interesting growth experiments upon the quahaug, scallop and clam were conducted in sand boxes
Plan of biological raft used at Monomoy Point for growth experiments and spat collecting. The raft, 20
7. Plan of biological raft used at Monomoy Point for growth experiments and spat collecting. The raft, 20 feet long by 10 feet wide, provided with a central well and four trap-doors, was anchored to the Powder Hole in 20 feet of water. Wire cages and wooden
 
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