File:Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects (1917) (14597720520).jpg

Identifier: goldfishvarietie00inne (find matches)
Title: Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects
Year: 1917 (1910s)
Authors: Innes, William T. (William Thornton), 1874-1969
Subjects: Aquariums Goldfish
Publisher: Philadelphia, Innes
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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y should not be filled beyond 14 to 15 inches. With theoutside tanks this gives a safety margin of several inches before a heavydownpour of rain causes the level to rise to the screened safety overflowsone inch from the top. It also catches practically all of the rainwater ofthe season, w^hich is excellent for the fishes. If the water becomes high itcan be siphoned off from the bottom until original level is reached. Theadvantage of being able to fill up, if necessary, to 19 or 20 inches in aninside tank is that at certain seasons the greenhouse capacity for fishes is 66 GOLDFISH VARIETIES AND taxed to the fullest. At such times the extra volume of water for thestorage of fish stock will be keenly appreciated. An economy of space canbe effected by building wooden tanks to stand over the section markedBreeding Ponds in figure 50, thus making two rows here instead ofone. The wooden tanks should be somewhat narrower than the lowerconcrete pools. ^^m\ JMiK\\inn;ii\iii\iifn,wu)n\/fMi)Miuim
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Fig. 50. Wholesale Breeding Establishment, Showing Greenhouse andOutdoor Concrete Tanks Goldfishes are hatched in the greenhouse from February until April.The young, as stated in the previous chapter, should not be placed outuntil the weather is settled, but there is a magic about outdoors which putsgrowth 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 aswell as might be expected in greenhouses. The author suggests that thewater is too dead, owing to lack of evaporation, the atmosphere beingalready charged with dampness. Evaporation produces cold. The cold,oxygenated water drops to the bottom, thereby setting up a beneficial cir- TROPICAL AQUARIUM FISHES 67 dilation of re-vitalized water. Also there is more microscopic life falls onthe water outside than indoors. A partial renewal of water in indoortanks is undoubtedly benef

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