554 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



" They escape through the meshes of the wire-cloth as fast as they 

 hatch. It will take at least tweuty-four wires to the inch to hold them, 

 and I think the eggs require less current than shad-spawn. 

 "Yours, 



MARCELLUS G. HOLTOIn". 

 " Prof. Spencer F. Baird, 



" Washington, D. 0." 



Mr. Holtou, in another letter, reported the eggs obtained from two 

 spawners at 120,000, and out of these he estimated the number hatched 

 at about 70 per cent., or 80,000 young fry. The female parents weighed 

 six and eight pounds. The eggs were nearly equal in size to those of a 

 shad; the newly-hatched fry were somewhat smaller. 



The fact that the ova were non-adhesive, unlike most of the percoid 

 fishes that have been dealt with, was a matter of surprise. The weight of 

 the spawning-fish is somewhat less than has usually been attributed to 

 rock-fish in spawning-condition. If localities can be found where rock- 

 fish may be taken in sufficient numbers in the breeding season, the 

 increase of this species is probably as sure to be effected as that of the 

 shad has been. 



We append a list of the species already referred to, and also of those 

 with which small experiments have been made, with varying success, 

 in the United States. The perch, {Ferca flavescens ;) the walleyed 

 or glass eyed pike, {Stizostedium americanum ;) the rock-bass, {Roecus 

 lineattis ;) the salmon, [Salmo salary) the California salmon, {Salmo 

 quinnat ;) the hrooktront, {Salmo fontinaUs ;) the Pacific coast brook- 

 trout, (/S'rt /mo iridea ;) the Utah trout, {Salmo virginalis ;) the land- 

 locked salmon, {Salmo sehago ;) the salmon or Mackinaw trout, {Salmo 

 namayciish ;) the lake white-fish, {(Joregonus albus;) the Otsego bass, 

 {Goregonus otsego ;) the lake-herring, {Coregonus clupeiformis ;) the gray- 

 ling, {Thymallus tricolor ;) the shad, {Alosa sapidissima ;) the alewife. 

 {Pomolobus pseudo-liarengus ;) the common sucker, {Catostomus com- 

 munis ;) the shiner, {Stilbe crysoleucus ;) the corporal or chub,( Semotilus 

 corporalis.) 



Collating from numerous authorities on fishcul^ture in Europe, we are 

 enabled to give the following list : The burbot or la lotte, {Lota vulgaris ; ) 

 the salmon, {Scdmo saUtr ;) the sea-trout, {Sabno trutta ;) the river trout, 

 {Salmo far io) ; the lake-trout, {Salmo lacmtris ;) the ombre chevalier or 

 rothel, {Salmo umbla ;) the chavr, {Salmo alpinus ;) the hucho, {Salmo 

 huclio ;) the la veret, (Co m/omts laveratus ;) the f era,, {Coregonus f era;) 

 the mnYiXiWA, {Goregonus marwna ;) thejja/e'e, {Goregonus palea ; the Gore- 

 gonus albula ;) the gmyhng, {Thymallus vulgaris ;) the Gar\>, {Gyprinus 

 carpio ;) the crucian carp, {Gyprinus carassius ; Gyprinus Iwlfarii ;) 

 the tench, {Tinea vulgaris;) the white-bream, (Aftra/jm blicca ;) the 

 ablette, {Gyprinus alburnus ;) and the sterlst, {Acipender ruthenus.) 



Of the hybrids claimed to have been produced artificially, which but 

 few seem to have attained maturity, we give the following list : 



