Theerachai Pongjanyakul, Jongkon Boonngarm, Praneet Ngamsnae, Kanjana Payooha, and Jarungjit Grudpan

DOI: 10.14456/sjst-psu.2021.59

pp. 453 - 459

Abstract

The study on protein requirement of young Siamese spiny eel, Macrognathus siamensis (GÜnther, 1861) was
conducted using six different protein level (35, 40, 45, 50, 55 and 60 % protein) with average gross energy of 450 kcal·100/g.
The results demonstrated the maximum specific growth rate (SGR), % weight gain and daily weight gain were achieved at 55%
protein while the fishes fed with 35% protein was the lowest. It was estimated by broken line regression that dietary protein level
producing maximum growth was 46.50% protein. There was no significant difference (P>0.05) on survival rate amongst
treatments. Protein efficiency ratio (PER) and apparent net protein retention (ANPR) were not significantly (P>0.05) affected by
diet protein levels. No significant (P>0.05) effect of dietary protein levels was found on carcass moisture, crude protein, crude
lipid and ash. However, carcass moisture, protein and ash were apparently increased in all fish groups after feeding trial,
comparing to fish before the experiment.