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Title: Use of a mixture of vegetal (kernel meal) and animal (fish silage) by-products as protein source in shrimp diets

Hervey Rodriguez Gonzalez

Instituto Politécnico Nacional, Mexico

Biography

Dr. Hervey Rodríguez González is a Professor at Instituto Politecnico Nacional, Department of Aquaculture. He has over 10 years of applied research. Dr. Rodríguez has over 30 publications on aquaculture, including publications on aquaculture nutrition and feeding, and reproduction. Dr. Rodriguez has a B.Sc. in Biotechnology Engineer (specializing in aquaculture) from the Autonomous University of Guadalajara in 1997. Dr. Rodríguez earned his Ph.D. in 2006 from Northwestern Center of Biological Research.

Abstract

This study evaluated growth responses of the white shrimp Litopenaeus vannamei testing different combinations of Jatropha curcas kernel meal (JCK) and tilapia waste silage (FS) as dietary protein sources under laboratory and pond conditions. A reference diet (RD) based on fish meal was elaborated to contain 35% crude protein and 434 kcal/g; then, five isoproteic and isoenergetic experimental diets were formulated from RD with different FS/JCK proportions as follows: 75% FS/0%JCK (D1); 56.25% FS/13.25%JCK (D2); 26.5%FS/30.89%JCK (D3); 18.75%FS/39.75%JCK (D4); 0%FS/53%JCK (D5). For the laboratory trail, shrimp (2.90 g) were stocked at 10 m2 in an indoor recirculating system during 90 days. There were differences (P<0.05) among the growth parameters of diets. Mean weight gain fluctuated from 6.71±0.61 g observed for the D1 diet, to 9.70±0.61 g for the RD group. The RD and D4 diets obtained the highest mean final weight (above 12 g), weight gain (above 9 g) and specific growth rate values (above 1.6 %/d). Average final survival was 90.97%. The RD and D4 diets were used for the pond trail. Shrimps (0.49 g) were stocked at 10 m2 within 1m3 cages into the pond for 35 days. Weight gain (3.47 g) and survival (93.33%) of shrimps were similar (P>0.05) between the diets.  Quadratic equations with the laboratory data indicated that the maximum responses for growth parameters correspond to FS and JKC inclusion levels of in the range of 27.83 to 29.00%, and 32.25 to 33.64%, respectively. A combination of 18.75% FS/39.75%JCK meals as protein source is a potential alternative to effectively substitute FM in practical diets for L. vannamei at the studied ages under both laboratory and pond conditions.

Audience take away:

  • The audience may know an alternative for the use of agricultural by-products.
  • It provides a practical solution to waste.
  • The research provides new information on animal feed