Fish listed in this category are Omnivorous. This means that the fish may eat both plant material and meaty foods.
Algae is not conspicuous in the majority of reef habitats, and the main factor that affects its abundance is the presence of herbivores (i.e., fish and sea urchins). For example, on shallow fore-reef slopes where herbivores are abundant, all algae have been consumed – with the exception of coralline algae, the “roots” of filamentous forms and macroalgaes that have chemical or structural defenses (e.g.,Halimeda). It has been estimated that in this reef zone, herbivores take from 40,000 to 156,000 bites per meter squared per day. Knowing this, it should not be surprising that if herbivores are removed, thewould grow like mad. In fact, in reef habitats where algae-eating fish are not abundant, macroalgae is common and is a problem for sessile invertebrates. It has been suggested that modern reefs would not exist in their present form if it were not for the herbivores; these fish (and urchins) control the competitively superior macroalgaes from overgrowing other sessile organisms, such as corals. It has been suggested that on portions of the Great Barrier Reef, adult pinnate batfish (Platax pinnatus) may be the only hope for reefs being smothered by Sargassum macroalgae. This batfish, which is omnivorous, is one of the only fish known to feed heavily on this macroalgae that is overgrowing some nearshore reef areas.
Omnivores feed on both plants and animals. They comprise the second-most-specious guild in coral reef fish communities. The amount of each food group consumed depends on the species and the age of the fish, and it may vary from one location to another. For example, juvenile blue (Holacanthus bermudensis) and queen angelfish (H. ciliaris) feed more heavily on algae than the adults. In contrast, juveniles of the herbivorous brown-spotted spinefoot (Siganus stellatus) and the omnivorous(Centropyge bicolor) consume more invertebrate prey than their adult counterparts. This seems to be the trend in most herbivorous and omnivorous reef fish – they include more animal prey in their diets as juveniles. There is more nitrogen in animal prey, which is necessary for growth, than in plant material.
AquaNourish Omnivorous Fish Feed - Stage 2 - 10lb
AquaNourish Omnivorous Fish Feed - Stage 3 - 5lb
The structural components of a fish's digestive system include the mouth, teeth and gill rakers, esophagus, stomach, pylorus, pyloric caeca, pancreatic tissue ( and ), liver, gall bladder, intestine and anus. Not all components are present in all fish  A fish's digestive system is adapted to their food habits. In predatory (carnivorous) fishes, the mouth is usually large for engulfing prey whole, or in large chunks, and teeth are present on the jaws (maxillary and dentary) and tongue ( glossyhyal) for grasping live prey (). Gill rakers are short in carnivorous fish and pharyngeal teeth are short and pointed for moving prey down the throat. In omnivorous and fishes, the mouth is smaller and is usually devoid of teeth except for pharyngeal teeth that may be blunt and flat (molariform) for grinding or sharp and long for shredding. Gill rakers in these fish are typically fine to prevent the escape across the gills of small food particles.The liver in fish produces bile which is stored in the gall bladder until a bolus passes the stomach, at which time the bile is expelled into the intestine. Bile contains waste products of liver activity which pass out of the fish in the feces. Bile has a digestive function in that it lipids, greatly increasing their absorbtion in the intestine. The liver is key in the and of amino acids absorbed during digestion and is also the site of storage of food energy in the form of . Most absorbtion of nutrients occurs in the intestine. The large protein, fat, and starch molecules in food that have been broken into smaller molecules by gastric acid and digestive enzymes move by diffusion or active transport (ATPase pumps) into the network of capillaries surrounding the gut. The intestine is lined with finger-like out-pocketings (villi) that greatly increase the surface area for absorbtion. The intestinal wall, while not as active as the exocrine pancreas, can secrete digestive enzymes, as well. The canal is typically a short, S-shaped tube in carnivorous fish, but can be long and convoluted in omnivorous fish to aid in the absorbtion of less digestible plant material.