Hydrolysate of lipid extracted microalgal biomass residue: An algal growth promoter and enhancer

•Exploitation of abundantly available algal bloom.•Utilization of hydrolysate of lipid extracted microalgal residues (LMBR).•Enhancement of biomass and lipid productivity of C. vulgaris by LMBR hydrolysate.•Increased volumetric productivity of protein and neutral lipid by LMBR hydrolysate.•25% AH substitution is optimum for maximum biomass productivity.