Tilapia are herbivorous fish that feed mainly on algae, aquatic plant cells and almost any plant-based food source. When produced for the food market through aquaculture, their diet may also include standard farm feed products containing fish meal or fish oil. One of the top 10 fish consumed in the United States, tilapia have become the third-most commonly harvested farm fish.Know More
Because of the reduced cost of tilapia farming, this fish has been referred to as the "aquatic chicken" of the trade. Since they are not carnivorous, they are relatively free of the concentrations of toxins that can accumulate at the food chain's higher levels. Representing a good source of protein, farmed tilapia production has reached a revenue level close to that of trout and salmon. As of 2014, the estimated annual value of the farmed tilapia production is $1.8 billion. Most of the fisheries were originally in Africa, but the largest worldwide producer is now China with Egypt in second place.
Since lower levels of omega-3 fats along with a higher ratio of omega-6 fats have been found in tilapia farmed in the U.S., some controversy occurred regarding the fish's status as a healthy food. Studies have been conducted which indicate that the inclusion of flaxseed derivatives, which are a vegetable source of omega-3 fatty acids, into the farmed tilapia diet can help to address nutritional concerns.
Because tilapia feed on troublesome floating aquatic plant life, such as duckweed and algae, they are gaining popularity as a natural form of biological control for aquatic plant problems. Their introduction into an aquatic environment can reduce or eliminate the need for toxic chemicals and algaecides containing heavy metals. The reduction of plant-based aquatic detritus by tilapia contributes to the size and health of the other fish.Learn more about Fish
Siamese algae eaters grow to a maximum of 6 inches under ideal conditions. The popular aquarium bottom feeder is often just 1.25 to 2.5 inches long when purchased.Full Answer >
While the specific diet of a freshwater fish depends on its species, most eat smaller fish, leeches, worms, insects, crustaceans, plankton and krill. When kept in an aquarium, freshwater fish can thrive on a combination of fortified flake food, pellets, sticks and wafers.Full Answer >
Herring eat only plankton, which are tiny plant and animal species in the ocean. Plankton come in many varieties, ranging from tiny arrow worms to algae. In order to feed, herring swim through water with their mouths open, filtering the plankton out of the water. They generally spend most of the daytime in the deep waters, rising to the surface to feed at night when predators are less active.Full Answer >
Walleye are piscivores (i.e. fish-eaters) and usually feed on any species of fish that they can catch and swallow, states the University of Minnesota website. They commonly eat yellow perch and various species of minnows and darters. Larval and young walleye eat waterfleas, copepods, small insect larvae and larval fish.Full Answer >