REPORT OF COMMISSIONER OF FISH AND FISHERIES. XXXVII 



Mr. Eobinson has noticed that eggs handled in the ordinary way, 

 and with water of the usual winter temperature, are most delicate be- 

 tween the sixteenth and twentieth days. They are then adhesive and 

 will stick to the sides of the box when the tide begins to ebb, unless 

 one is very careful to keep the sides thoroughly wiped off two or three 

 times a day. Early in the season, when the water is warmer, the eggs 

 become adhesive at the age of five or swc days and must be brushed off 

 the sides and lower edge of the jar with a feather. 



The slow tidal motion of the box was found to be entirely suitable 

 for the care of the young. When the temperature of the water fell to 

 30° all the spawning fish died. 



The Haddock (Melanogrammus crglefinns). 



Not much success was achieved in hatching haddock eggs. Mr. 

 Kobinson found them to be larger thau those of the cod, and to have a 

 beautiful pinkish color. They measure sixteen eggs to the inch, while 

 the cod measure eighteen. 



One lot of haddock eggs taken after the middle of March contained 

 only fifteen and a half to the inch. There are 100,000 fewer eggs in 

 a quart of the haddock than of the cod. A quart of cod eggs number 

 33G,798, and a quart of haddock eggs 236,556. 



Haddock eggs are more tender than any other eggs that Mr. Kobin- 

 son has yet handled. Often on the fourth or fifth day the eggs would 

 all die, with scarcely any loss up to that time. Tbey will float in water 

 which is less dense than that suitable for cod. All the eggs of this 

 species were taken in water of a density of 23J except 75,000. After 

 the weather seemed to be settled and the water in the tank rose above 

 33°, the density of the water changed from 27 to 25 and 24 J, and as 

 low as 23. This change took place on or about April 1, and interfered 

 greatly with the success of the hatching operations. 



Floating eggs. — 250,000 floating eggs of undetermined species were 

 brought in the Grampus hatching bucket and in pans from Narragan- 

 sett Bay to Wood's Holi in June, 1888, by Dr. Bean. 150,000 of these 

 were hatched and planted and embryps kept for identification. 



The Tautog (Hiatula onitis). 



The Mackerel (Scomber scombrus). 



The Scup (Stenotomus chrysops). 



Fair results were obtained at the Wood's Holl Station in hatching 

 eggs of the last three species, and when it becomes necessary to apply 

 artificial methods to their reproduction the work can be successfully 

 prosecuted. 

 The Red-eye Perch or Rock Bass (Ambloplites rupestris). 



6,628 adult fish of this species were collected in the vicinity of Wythe- 

 ville, for distribution to ponds in Virginia and elsewhere. On March 

 1, 1887, 20 small individuals were sent to Herr Max von dem Borne, of 

 Berneuchen, Germany. A new station was provided for in 1888, at 

 Neosho, Missouri, for the cultivation of this and allied species for in- 

 troduction into waters of the Southwest. 



