604 KEPORT OF COMMISSIONER OF FISH AND FLSHEKIES. [138] 



thoroughly refuted by the siumltaueous successful cxperiuicnts iu rais- 

 ing these fish iu ponds made at Lubbinchen and Taukow. It has also 

 been showu that the Goregonus niarama (and probably other Icinds of 

 Corcgonus) will tiirive iu water coutaiuiug iron and comiug from ]>eat- 

 bogs; and that it can, in comparatively small i)ouds, by feeding, ])e de- 

 veloped to one year's fish, and very probably be raised to any desired 

 age. Tlie various liiuds of Corcgoincs should thereibre be brought 

 within the reach of pond culture; and for this purpose special Corego- 

 iiKs i)onds should be constructed. 



4. l>y numerous experiments it has been proved that Corcgonus, even 

 when ])laced in ponds which in every' way were well suited for the i)ur- 

 pose, did thrive, but would never propagate. The reason for this must 

 be found solely iu the peculiar manner in which the Coregonua spawns. 

 If the spawning of the Coregonus is to be successful, the number of 

 spawning fish should be very large. 



5. Five years' experience iu the Tietzel Lake has proved how well 

 these fish thrive. This lake covers about 10 hectares and is -0 meters 

 deep; it contains clear, soft water, is not fed from any outside sources, 

 and is amply supplied with fish-food, principally tadpoles, small fish, 

 Gammdrn.s 2y>(lt'x, various kinds of snails, mussels, &c. The bottom is 

 com[)osed of clayey marl, and is thickly covered with aquatic i)lants. 



Mr. Eckaidt adds, that iu 1877 he raised iu his ponds Goregoiins nine- 

 teen months old wdiich measured 32 centimeters in leugtli, and that 

 these fish also thrive iu marshy pouds. He gives the following hints 

 lor introducing these fish iu lakes and pouds: 



1. Proprietois of hatcheries should buy impregnated Corcgonus eggs 

 and have them hatched in their establishments. Eight days ;ifter the 

 young fish have s]i])ijed out of the eggs they should be place<l in lakes 

 or in protected ]>onds <M)ntaining no other fish. The latter will i»roba- 

 bly be the better i)lace. 



2. Proprietors of lakes without hatcheries or i)0uds may scatter the 

 iuipregnated eggs in the lakes in places where the bottom is sandy, 

 taking care that the eggs do not accumulate in any place, so that no 

 s[)oiled eggs, which are soon covered with mold, spread disease among 

 the healthy eggs. 



3. Mr. Eckardt states that Coregonus eight to twelve days old may 

 be ordered direct from his establishment at Lubbinchen. The manage- 

 ment and feeding of Coregonns iu winter is like that of the brook trout. 



lo. THE EEL (Aiiguilla vulgaris). 



As at present eels fetch a pretty good price, and as young fry, called 

 in French monUe, can be obtained comparatively cheap from the 

 Huuingen establishment, the kee[)ing and raising of these fish is well 

 worth the attention of every pond cultivator. As soon as eels have 

 reached a sniiuhic size they Ibiin an excellent addition to the pike in 

 carp stock p'omls. it cannot entirely supplant the pike, because it is 



