A method for feeding fish raised in a pisciculture environment wherein fish feed is conducted to the fish pen or enclosure carried by a stream of water. To give the feed increased buoyancy after it is introduced into the enclosure, the stream of water is oversaturated with gas, such that gas bubbles penetrate into and/or adhere to the fish feed.
A method of using phosphate chemicals of the formula LDPO.sub.4 to provide controlled release nutrients to the food chain in aquatic environments to supply improved feeding and growth of fish, wherein L represents a monovalent Lewis Acid moiety, D represents a divalent metal moiety, and PO.sub.4 represents an orthophosphate moiety. The method includes the use of slow release phosphate chemicals which provide water soluble nutrients disseminating in flowing water streams for a period of about one year. The chemicals include: magnesium ammonium phosphate, manganous ammonium phosphate, zinc ammonium phosphate, ferrous ammonium phosphate, magnesium potassium phosphate, manganous potassium phosphate, and manganous potassium phosphate.
A method and apparatus for administering a fluid solution to an individual fish, wherein the fish is placed in a feeder apparatus connected to a metering device. The metering device stores a quantity of the solution. The feeder apparatus includes a hooded cavity for placement of the head of a fish and a calibrated adapter for placement into the mouth of the fish. The calibrated adapter has a throughbore communicating to the stored quantity of solution in the metering device so that triggering the metering device expels the fluid directly into the mouth of the fish.
