Lipids (fats and oils) are an easily digested source of concentrated energy, having more than twice as much energy as an equal amount of carbohydrates. They play several important roles in an animals metabolism, including supplying essential fatty acids (EFA), helping absorb fat-soluble vitamins, and other important functions. Also, including lipids in the diet may increase food intake. Lipids stored in body tissues affect the flavor of the flesh. The type and amount of lipid in catfish diets is based on EFArequirements, economics, constraints of feed manufacture, and quality of fish flesh desired.
A small amount of lipid should be included to supply EFA. Catfish apparently require 0.5 percent to 0.75 percent omega-3 fatty acids in the diet. Aside from meeting EFArequirements, lipid is not necessarily required as a nutrient in the diet of catfish. But since it is a concentrated source of energy and is less expensive than protein, some fat should be included in catfishdiets. Too much dietary lipid, though, may result in too much fat deposited in the body. This may affect processed yield, product quality, and storage of processed products. Also, high-lipid feeds may be more difficult to pellet, but if needed, supplemental lipid can be sprayed onto the finished feed pellets.
Lipid levels in commercial feeds for food-sized catfish rarely exceed 5 to 6 percent. About 3 to 4 percent of the lipid is in the feed ingredients naturally, with the remaining 1 to 2 percent being sprayed onto the finished pellets. Spraying feed pellets with lipid increasesdietary energy and helps reduce feed dust ("fines"). Essential fatty acids can be supplied by marine fish oil such as menhaden oil. Natural food organisms, such as zooplankton, found in the pond are also a good source of EFA. High levels of fish oil may give "fishy" flavors to the catfish flesh. Catfish feeds manufactured in Mississippi are generally sprayed either with menhaden oil, catfish oil, vegetable oil, or a blend of oils.
All catfish require much the same thing in captivity. Their main demand is for a mixed diet including green algae, fresh vegetables such as carrots, courgettes, and spinach, and clean bogwood. In the wild, these fish feed almost entirely on wood and algae, and the meaty foods enjoyed by other are not required. Because they are relatively large for aquarium fish and produce an unusual amount of waste, a big tank with a good filter is essential. Royal panaques at least are adaptable as far as water chemistry goes and though they prefer somewhat soft, slightly acid water conditions they will tolerate hard, alkaline water as well.
What Do Catfish Eat? | Sciencing
TBARS (A), protein carbonyl (B), NPSH (C), and ascorbic acid (D) in liver of silver catfish fed for 60 days with diets containing 0 or 3.0 mg/Kg of (PhSe)2 and after exposed to quinclorac herbicide or to control conditions. Data are reported as mean ± SEM (n = 12). (*) P#) P
Their diet can also vary quite a bit
Fish fed with the control diet and exposed to quinclorac showed higher TBARS levels, while protein carbonyl did not significantly change (). Treatment with (PhSe)2 per se decreased TBARS levels and protein carbonyl of silver catfish (). Furthermore, (PhSe)2 was effective to prevent the increase of both MDA and protein carbonyl content caused by quinclorac exposure ().
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