XXIV REPORT OF COMMISSIONER OF FISIl AND FISHERIES. 
Pollock . — Experiments were made in hatching pollock eggs, with fair 
success considering the disadvantages in handling a species new to 
artificial propagation. Total number of eggs obtained, 32,000,000 ; lost 
in incubation, 25,000,000; number of fry hatched and turned out, 
7,000,000. Seventeen million eggs were lost at one time in consequence 
of a heavy storm occurring in the latter part of November. Jn hatch- 
ing, the best results were obtained with the McDonald tidal box, hav- 
ing the water turned on sufficiently strong to keep the siphon from 
breaking after the water had been drawn down to its lowest point. 
WOOD’S HOLL STATION, MASSACHUSETTS. 
This station was operated during the entire year, with Mr. John Max- 
well as superintendent and Prof. John A. Ryder in charge of the labora- 
tory. Mr. Richard Dana conducted the fish-cultural work. Important 
changes and improvements were made in the pumps and boilers, and the 
electric-light plant was finished and put in operation. 
Cod . — The cod work was very much hampered by the difficulty of 
obtaining spawning fish, and by the northwesterly gales during De- 
cember and January, when many of the eggs were killed by the mud 
and slime. m 
The Grampus furnished 967 codfish from October 25 to November 22, 
1888. These were kept in live cars and fed occasionally ; and 11,640,000 
eggs were obtained from them between October 29, 1888, and February 
28, 1889. From the eggs kept at the station 5,871,000 fish were obtained. 
From the Gloucester Station 4,284,000 live eggs were received, which 
yielded 3,306,000 fry. Seventy thousand fry were kept in a glass aqua- 
rium twenty- two days, being fed on clam juice; but a sudden change of 
temperature killed them all. From dead fish -were taken 148,000 eggs, 
which were hatched and planted. 
The apparatus employed consisted of Chester hatching boxes and 
McDonald improved tidal boxes. The period of incubation in the Mc- 
Donald apparatus averaged eighteen days; in the Chester apparatus, 
twenty days. 
Sole . — The soles imported from England were kept at Wood’s Holl 
until October 6, 1888, when the Commissioner personally superintended 
the planting of 28 individuals in Vineyard Sound, near Quick’s Hole. 
Mackerel . — Vinal N. Edwards, on May 21 and 24, collected 215,000 
mackerel eggs, from which 185,000 fry were hatched and planted in 
Vineyard Sound, May 29. Eggs taken June 3 from fish which had been 
dead a few minutes could not be developed. 
Scup . — On May 22, 50,000 eggs of this species were taken; 30,000 
were hatched, and the young were deposited in Wood’s Holl Harbor, 
May 29. 
Sea kass . — From the 5th to the 10th of June, 1,150,000 eggs were 
collected. Of these 1,025,000 were hatched, and the fry were planted 
between June 10 and 13. 
