INTECH   27907
Unidad Ejecutora - UE
congresos y reuniones científicas
Diet Composition and Somatic Growth in Pejerrey (Odontesthes bonariensis)
Mar del Plata
Jornada; XXI Jornadas Anuales de la Sociedad Argentina de Biología y 4ta Reunión conjunta de Sociedades de Biología de Argentina; 2019
Institución organizadora:
SAB y Sociedades de biociencias de la Argentina
Pejerreyis a South American fish with a high potential for aquaculture. Due to itsflesh quality, it has been considered a good candidate for aquacultureproduction since the beginning of the 20th century. However, this isstill on hold as a consequence of both economical and biological factors. Amongthe latest we can find a low growth rate in culture and the lack of a specificand economical formulated diet. Therefore, the aim of this study was todetermine the dietary protein:lipid ratio to ensure the best growth rate inearly developmental stages. Pejerrey fry were fed for 60 days with fourexperimental diets containing low (400 g Kg-1) or high (500 g Kg-1)protein (LP or HP, respectively) and low (120 g Kg-1) or high (200 gKg-1) lipid (LL or HL, respectively), in the following combinations:LP-LL; LP-HL; HP-LL and HP-HL. Growth parameters were determined every 15 daysand at the end of the trial total mRNA of head and trunk of pejerrey fry(post-larva) were obtained to determine the expression levels of some genesinvolved in lipid metabolism, food intake and growth regulation. Fry fed withdiets LP-LL and HP-LL showed the highest growth rate and growth hormone (gh) mRNAexpression levels. Gene expression of ∆6-desaturasewas high in head of fry fed with diet LP-HL. Gene expression of nucb2/nesfatin-1 and gh in head, and of nucb2/nesfatin-1 and the ghr-Iand ghr-II in body followed the samepatterns. In conclusion, diets with LL ensure pejerrey fry growth compared tothose that contain HL. In these LL groups, mRNA expression of genes from theGH-IGF axis were associated with the observed somatic growth promotion. Theexpression of nucb2/nesfatin-1 seemsto indicate some effect of this peptide not related to food intake regulation,e.g. a regulatory role on GH expression, that would warrant future research. Ourresults contribute to stablish the pejerrey?s nutritional requirement for thedevelopment of its sustainable aquaculture production.