120 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



Season in R. I.: Introduced by the Rhode Island Fish Commission into 

 the following streams and ponds: Richmond, One Hundred Acre, 

 Roger Williams Park, Skinflint, Hospital, and Fenner's ponds; Quid- 

 nick Reservoir; Penicatuck and Pawcatuck Rivers. 



Reproduction: Spawns from April to July. Eggs are adhesive and are 

 attached to stones during the incubation period, which lasts from one 

 to two weeks. The larvse remain in the nest a week or ten daj's, and 

 at the age of two weeks will measure about three-quarters of an inch 

 in length (Bean, 1903). (Lydell, Bull. U. S. Fish Com., XXII, 1902, 

 39; Brice, Report, U. S. Fish Com., XXIII, 1897, 159.) 



Food: Carniverous, voracious; feeds on small fishes of all kinds, crawfish, 

 frogs, insects, and all other aquatic animals of suitable size. 



Size: Eighteen inches or more. 



PERCID^. The Perches. 

 117. Perca flavescens (Mitchill). Yellow Perch. 



Geog. Dist.: East of the Alleghanies and in the Great Lakes region. 

 Abundant everywhere throughout New England (Kendall, 1908). 



Season in R. I.: Common in ponds and streams throughout the State. 

 Reported from Benedict, Fenner's Mashapaug, Larkin's, Watchaug, 

 and Roger Williams Park Ponds; reservoirs in North Providence, 

 Poneganset Reservoir; Pocasset, Queen's, Ten Mile, and Pawcatuck 

 Rivers. 



Reproduction: Spawns in March and April. Eggs hatch in eight to ten 

 days in water 60°. Eggs are about 1-7 inch in diameter (3.5 mm.), and 

 have a large oil globule. The eggs are laid in flat bands consisting of a 

 single layer agglutinated together by an adhesive material. These 

 bands of eggs somewhat resemble those of the goose-fish (Lophius), but 

 they are not so large and do not float on the surface. (Worth, Bull. 

 U. S. Fish Com., X, 1890, 331.) The larvse just hatched are about 1-5 

 inch long (5 to 5.5 mm.). For a time it grows slowly, since a sixteen- 

 day larva is only a little over ^-inch (6 mm.) in length. (For a descrip- 

 tion of the eggs and young see Ryder, Report, U. S. Fish Com., XIII, 

 1885, 518; also Brice, Report, U. S. Fish Com., XXIII, 1897, 182; 

 Ehrenbaum, Nordisches Plankton, 4, 1905, 11.) 



Food: Small fishes, crustaceous insects, etc. 



Size: Maximum, one foot. Perch spawns at the age of one year. (Seal, 

 Forest and Stream, A])ril 17, 1890.) 



