Aquarium Fish - Small Fish
Either fry or small fish can be used to feed marine fish doubtful about artificial food, or large freshwater fish. With this in mind, some aquarists breed prolific species that reproduce easily (Poeciliids, for example). Other live prey (larger than 1 cm) Keeping and breeding worms or insect larvae is also possible, though it sometimes proves time-consuming. The range of live prey listed above is adequate for the needs of your fish. Planktonic food Freshwater or marine plankton contain a host of organisms barely visible to the naked eye (0.1-1 cm) but valuable for feeding fish, especially the fry. Collecting them in a natural setting is tiresome, and involves a risk of introducing potential microscopic hosts into the aquarium and spreading disease. Some planktonic food is available on the market in frozen form. Brine shrimps This is the “magic” food that every aquarist should breed. This primitive crustacean grows to 1 cm when adult and is called Artemia salina. They live in the heavily saline waters of salt marshes, feeding on the micro-algae that they gather with their filtering legs. Their characteristic most relevant to the aquarist is that their eggs can be stored dry, with their development interrupted, for use later on. Once the eggs are returned to salty water, they hatch rapidly and produce a larva called a nauplius, which measures only 0.3 mm and is particularly suitable for feeding to fry. Feeding brine shrimps to fish is easy, even for an amateur (see box). They are still too big for the fry of some fish, however, especially marine species. In such cases, it is possible to use rotifers, animals halfway between worms and crustaceans, which have a crustacean-like shell and never grow to more than 0.2 mm. Rotifers These are more complicated to breed than brine shrimps, as they must be fed planktonic micro-algae which also need to be cultivated. It is therefore best to obtain them from a laboratory specializing in oceanography or marine biology, and to get advice on the essential steps required to look after them for a few days - the time within which the fry for which they are intended will be big enough and sufficiently developed to move on to a diet of brine shrimp nauplii.
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Tags: freshwater fish, small fish