Effect of the shrimp farming wastes as co-feed on growth performance and digestibility of juvenile grey mullet, Mugil cephalus

A feeding trial was carried out to evaluate the utilization of residual nutrients from shrimp farming wastes (SFW) as co-feed in juvenile grey mullets Mugil cephalus. Four treatments were designed offer different proportions feed. The first treatment (control) consisted entire daily portion with only commercial feed for marine fish (SFW0). remaining replaced 33, 66, and 100%, respectively, SWF33, SWF67, SWF100. Feed offered 4% mullet total biomass at each experimental tank. Results showed that final weight, weight gain, specific growth rate, relative thermal coefficient reduced when proportion SFW their increased. However, a digestive capacity allowed them use ratio up 66%, increasing initial by 25%. increase waste negatively affected whole-body proximal composition. digestibility results could digest 41% protein. suggest are capable utilizing waste. it is necessary complement an alternative source induce optimal performance mullets. It also recommended be fed formulated meet nutritional requirements maintain protein lipid content whole body under culture conditions.