F: Phytobiotic technology Figure 2: Survival rates
Figure 1: Feed conversion ratio
Feed Treatment Methods
and survival rates are shown in Figures 1 and 2. Feed conversion ratio was A commercial shrimp feed was used reduced by an average of 25 percent in for the entire duration of the trial manuthe Orego-Stim ® Aquatract ponds. factured by a leading Shrimp feed manufacturer. Shrimp were fed twice a day at a Total survival rates of the Orego-Stim® rate of 60 percent their daily ration in the Aquatract ponds were almost twice the morning and 40 percent in the afternoon. control ponds. Table 3 shows the huge differThe trial lasted for a period of four-and-a-half months with post larvae stocked into Figure 3: Total harvest weight and FCR five ponds, three control and two Orego-Stim ® Aquatract trials. Shrimp were harvested at an average weight of between 23g and 26g. Orego-Stim® Aquatract was applied topically to the pellets prior to feeding at a concentration of two kg per tonne dissolved into a small quantity of blended marine fish oil.
Feed conversion ratio & Survival rates The trial was compromised by an invasion of a species of marine ghost shrimp which competed for commercial feed and had cannibalistic effects. Consequently, FCR was higher than expected and survivability was lower than expected. The feed conversion ratio Figure 4: Harvest weight per hectare
ences in harvest parameters made between the two treatments with a 72 percent increase in final total harvest weight and a 75 percent increase in the numbers of shrimp harvested.
Conclusion Mr Juan Achurra, the farm owner said, “In this field trial done on my farm, the Orego-Stim® Aquatract groups produced 3.5 tonnes harvest weight compared to the control group which produced two tonnes. “Harvest weights per hectare were 913kg with OregoStim® Aquatract and 472kg per hectare in the control groups. “These increased harvest weights gave me a 3:1 return on investment on the cost of Orego-Stim®, Aquatract.” 20 | International AquaFeed | May-June 2010
References Ceniacua & Akvaforsk 2002. Selective breeding of Litopenaeus vannamei in Colombia. Panorama Acuicola 7(2): 30-31. Chevassus, B and M Dorson, M 1990. Genetics of resistance to disease in fishes. Aquaculture 85: 83-107.
Henryon, M,A Jokumsen, P Berg, I Lund, PB Pedersen, NJ Olesen, and WJ Slierendrecht. 2002. Genetic variation for growth rate, feed conversion efficiency, and disease resistance exists within a famed population of rainbow trout. Aquaculture 209: 59-76. Moss, SM, RW Doyle, and DV Lightner. (2005) Breeding shrimp for disease resistance: challenges and opportunities for improvement. In: Diseases in Asian Aquaculture V pp. 379-393. (P Walker and R Lester, eds), Fish Health Section, Asian Fisheries Society, The Philippines. Mr Juan Achurra (Farmer Owner), La Morenita, Via Al Puerto, Entrando por la estación Eneríque Enseñat, Región Coclé, Panama World Health Organization 1999. Joint FAO/NACA/WHO Study Group on food safety issues associated with products from aquaculture. WHO Technical Report Series, No 883.