COBIA (Rachycentron canadum)

A 9-week feeding trial was conducted to investigate the effect of dietary carbohydrate level on thegrowth performance, body composition and apparent digestibility coefficient and digestive enzymeactivities of juvenile cobia. Six isonitrogenous and isolipidic diets containing graded levels of starch(1.3%, 6.5%, 12.5%, 18.4%, 24.2% and 30.4%) were fed to juvenile cobia. Specific growth rate(SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) increased with increasingdietary starch up to 18.4% (P0.05) affect the hepatosomatic index of the fish.The results from this study suggested that PBM could replace 100% dietary fishmeal withoutadversely affecting the growth performance, but an optimal replacement level at approximately60% was recommended for better growth performance and efficient feed utilization.252. Salze, G., McLean, E., Schwarz, M.H. & Craig, S.R. (2008). Dietary mannan oligosaccharideenhances salinity tolerance and gut development of larval cobia. Aquaculture, 274(1), 148-152.The potential beneficial effects of supplementing live feeds with mannan oligosaccharide (MOS;BioMos ® ) upon cobia Rachycentron canadum larval performance were examined. Characteristics offish examined included survival to weaning, growth, ability to withstand osmotic stress and thedegree of development of the brush border of the intestine. Live feeds included rotifers (Brachionusplicatilis) and Artemia which were enriched for 24 h with a commercial enrichment media alone orin combination with 0.2% (dry weight basis) MOS. Salinity challenges were performed at 6 dayspost-hatch (dph) and at 7, 13, and 14 dph (0 and 65 g L -1 for 6 dph; 0 and 55 -1 7+ dph)corresponding to transitions in feeding, to examine the ability of larval cobia to survive stress.Differences (P