Physiological and immunological condition of the Gulf of Mexico pink shrimp Farfantepenaeus duorarum (Burkenroad, 1939) grown in BFT System (Bio-Floc Tecnology)
Author: Manuel Angel Valenzuela Jimenez (Currículo Lattes)
Supervisor: Dr Wilson Francisco Britto Wasielesky Junior
Co-supervisor: Dr Carlos Rosas (UNAM/México)
Co-supervisor: Dr Gerard Cuzon (IFREMER/França)
Abstract
The pink shrimp F. duorarum is the species most caught in the Gulf of Mexico and the Caribbean Sea. At present, fishing for this species is collapsed. Cultivation can be an alternative for production and probably for its conservation. The objective of the present work was to establish the physiological and immunological condition of F. duorarum in a system called Bio-Floc Technology (BFT) which works with organic fertilization, high stocking densities, intensive aeration, minimum water exchange and controlling the ratio C: N. It can be established that the success of these shrimp farming systems could be associated with the supply of microbial protein and its consequence on the physiological and general health of organisms.An experimental design of two treatments was carried out with four replicates consisting of eight circular tanks with a capacity of 20 m3 for 118 days. The AC treatment maintained a 30% daily change and without organic fertilization, for the BFT Treatment sugar cane molasses was added to maintain the nominal C: N 20: 1 ratio. One gram juveniles were used, produced in the shrimp larviculture laboratory of UMDI-UNAM stocked at a density of 100 juveniles / m2 and fed with commercial feed. Hemolymph samples were taken every month to assess blood metabolites and variables such as hemagglutination, respiratory burst, total hemocyte count and profenol oxidase activity (proPO). Oxygen consumption was measured throughout the experiment. There were significant differences (p <0.05) among the treatments showing a better physiological and immunological condition in the BFT treatment shrimp. Shrimp growth during the first 100 days of cultivation was better in AC treatment. The blood metabolites indicate that the shrimps of both treatments are fed from the feed, plus the immunological indicators and the oxygen consumption seem to indicate that the microbial flakes stimulate a better health condition to resist periods of environmental stress such as the low temperature presented in the half of the experiment.