The Effects of Fodder Use Enzyme in Fish Nutrition
Abstract
The main purpose in fish nutrition from scientific point of view is to obtain a good growing rate but maintaining flesh quality and fish health also, resulting a healthy product for the consumer at low cost (Sing, 2008). First attempts about the use of enzymes to increase the digestibility of fodders have been made with enzymes isolated from fish guts. Several studies about using enzyme extracts from fish guts in fish nutrition were made by Dabrowski (1977) and Dabrowska (1979) with small positive results after using proteolytic enzyme extract from fish, in carp diet, Tomassion (1982) analyzed the enzymatic digestion with ?-amylase on trout and Carter (1992) presents the lack of response of Atlantic salmon to supplementation with ?-amylase. Jakson et all (2007) have analyzed the effect of microbial phytase on phytic phosphorus use. At the end of the experiment they noted that the fish fed with diet containing 500 units of phytase/kg have registered a superior growth rate than the control group. Analysis showed that bone ash, bone phosphorus and weight gain were higher and feed conversion ratio (FCR) was lower at experimental groups comparative with the control group. Nwanna L. C. et all (2008) had studied the effect of pre-treatment of dietary plant feed stuffs with phytase on growth and mineral concentration in common carp (Cyprinus carpio L.). Nwanna L. C. et all (2008) noticed that the phytase has increased mineral availability and utilization and decreased the discharges into the environment.
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