66 



GOLDFISH VARIETIES AND 



taxed to the fullest. At such times the extra volume of water for the 

 storage of fish stock will be keenly appreciated. An economy of space can 

 be effected by building wooden tanks to stand over the section marked 

 "Breeding Ponds" in figure 50, thus making two rows here instead of 

 one. The wooden tanks should be somewhat narrower than the lower 

 concrete pools. 



^^m\ JMiK\\inn; ii \iii\i i fn , wu)n\/fMi)Miu i m 



Fig. 50. Wholesale Breeding Establishment, Showing Greenhouse and 

 Outdoor Concrete Tanks 



Goldfishes are hatched in the greenhouse from February until April. 

 The young, as stated in the previous chapter, should not be placed out 

 until the weather is settled, but there is a magic about outdoors which puts 

 growth and vitality into the fish which the cunningest devices of temper- 

 ature, plants, food, aeration, etc., cannot successfully imitate in the green- 

 house. There has been much speculation as to why fishes do not do as 

 well as might be expected in greenhouses. The author suggests that the 

 water is too dead, owing to lack of evaporation, the atmosphere being 

 already charged with dampness. Evaporation produces cold. The cold, 

 oxygenated water drops to the bottom, thereby setting up a beneficial cir- 



