Can Sunflower Oil Replace Dietary Fish Oil Without Compromising Growth in Pejerrey larvae (Odontesthes bonariensis)?

BERTUCCI JI; TOVAR O; HERDMAN JE; CANOSA LF; UNNIAPPAN S

London, Ontario

Congreso; Canadian Society of Zoologiest Annual Meeting; 2016

Canadian Society of Zoologiest

Pejerrey (Odontesthesbonariensis) is an inland water fish from Argentina, with commercialimportance but with relative high cost for aquacultureproduction. In order to determine if sun flower oil can replace dietary fishoil during early stages, pejerrey larvae were fed with diets containing differentproportion of fish oil (FO)/sunflower oil (SfO): 100%FO; 50%FO-50%SfO;20%FO-80%SfO; 100%SfO. Biometric standards were measured at 0, 15, 30 and 45days. Then, samples of head, body and tail were collected and expression of genesimplicated in somatic growth, fatty acid metabolism and food intake regulationwere quantified by RT-qPCR. Results showed no differences in weight, standardlength, condition factor, survival and food intake among the differentexperimental groups. Gh, ghr-I and ghr-II showed an increased expression in100%SfO group. Expression of igf-IIwas higher in body of 100%SfO group compared with larvae fed with 100%FO. Δ6-desaturase mRNA levels were higher inhead and body of larvae fed with 100%SfO diet. Feeding with 80%SfO and 100%SfOled to a decrease in NUCB2/nesfatin-1transcripts in body compared to 100% FO group. Together, these results showthat FO can replace SfO in pejerrey larvae diets without compromising growthand development, and so decreasing production costs of this fish.