Abstract
This study aimed to evaluate the digestibility of tilapia by-product protein hydrolysate powder (TBHP) from tilapia filleting by-product, and its inclusion in diets for Nile tilapia larvae. In order to determine the apparent digestibility coefficients, two diets were formulated, the reference diet and the test diet (20% of TBHP) and, to evaluate the inclusion, six diets were formulated, which were with 0.0, 2.0; 4.0; 6.0, and 8.0% of TBHP. The apparent digestibility coefficients of crude protein and gross energy were 89.5 and 98.3%, respectively. At levels above 4.0% of inclusion of TBHP, the weight, final length and weight gain were impaired, however, survival rate was higher (p < 0.05). The TBHP can be used in diets for tilapia due to the high digestibility coefficients for crude protein and gross energy. The inclusion of up to 4.0% of TBHP does not affect the reproductive performance and survival rate of Nile tilapia larvae.
Highlights
The processing of residue from the Nile tilapia, including heads, viscera, skin and bones, represent a significant volume in the acquisition of the fillet, the main product sold
This study aims to evaluate the digestibility and inclusion in the diet for Nile tilapia larvae of the tilapia filleting by-product powder (TBHP), obtained by enzymatic process using the carcass, head and skin and subjected to spray drying
The composition of the hydrolysates is reflex of the substrate used as a raw material (Klompong, Benjakul, Kantachote, & Shahidi, 2009; Dieterich et al, 2014), as well as the centrifugation steps and filtration when applied for the removal of solids and when it is necessary the lipid fraction
Summary
The processing of residue from the Nile tilapia, including heads, viscera, skin and bones, represent a significant volume in the acquisition of the fillet, the main product sold. Separated meat, the tanned skin, flour and hydrolysates are some of the products that can add value to this remainder, which. Animal Sciences can be intended for human consumption, animal feeding (flour and hydrolyzed) and clothing and accessory industry (skin). Other products such as collagen and gelatin can be obtained from residue such as skin and scales, with use in different areas (Huang, Kuo, Wu, & Tsai, 2016; Zhang et al, 2016), such as the food industry as edible biofilms (Hosseini, Rezaei, Zandi, & Ghavi, 2013; Weng, Zheng, & Su, 2014)
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