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As we shall see in Chapter VII,the fact that the movements of the water in aeration are produced by air bubbles is usually of little consequence, and it is an example of get- ting the right result for the wrong reason. The old idea behind aeration was, of course, to increase the contact of air and water by sending fine bubbles coursing up through the tank. Unless a very brisk spray of very fine bubbles is used, however, the surface of water exposed to air in the bubbles is small and unimportant, and the movement caused at the tank surface is what matters.

Thus, we compute fish capacity from surface area, and we may modify this by including the effects of temperature, water movement, and various other factors. The warmer the water, the lower the solubility of oxygen, and thus the lower the fish capacity. The following estimates assume an average temperature of about 75°F. for tropicals and about 60°F. for cold-water fishes.



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The number of infusoria needed per day can be dumped into the tank in two or more doses and will not overpopulate the tank while being eaten, as long as the fry are not extremely crowded. That is why drip feeding is rarely a must, but the dumping has to be done with reasonable foresight and careful checks on the condition of the tank. Watch the fry, see that they are eating, and estimate, even if only roughly, the proper amount of culture to feed.

Quite wide margins are tolerated and only normal care has to be taken, but some care is essential. Remember that not very much is needed at the start, but the rate at which the fry require food is always increasing as they grow and larger amounts must be supplied. From the start, therefore, it is perfectly feasible to raise fry with 2 feeds per day, morning and evening (but give them light to feed by). Occasionally a spawning may be lost because of a foul tank or unnoticed underfeeding, but the numbers of spawnings that can be copedwith by this simple scheme more than make up for this mishap. Any- way, spawnings are lost more frequently by older methods. There are certain advantages, too, in the infrequent feeding technique.



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Pan Ocean Aquarium in Hayward, CA Goes Solar - RenewableEnergyAccess.com

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Feature: Explore and conquer
Malay Mail - In full diving regalia with the exception of an oxygen tank, each girl had to retrieve two Explorace tags from the few placed in various areas of the large aquarium tank. After a few false attempts to submerge, Wong developed breathing diffi culties.



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