Article info.

ABSTRACT

Received 19 Sep 2017
Revised 27 Apr 2018

Accepted 20 Jul 2018

The study was conducted to assess the possible use of protein extracted green seaweed (Cladophoraceae) in mudskipper (Pseudapocryptes elongatus) diets. Five isoenergetic and isonitrogenous test diets (approximately 30% crude protein and 7% crude lipid) were formulated through replacing different levels of the fishmeal (FM) protein (0, 15, 30, 45 and 60%) by the protein extracted from green seaweed, and triplicate per diet treatment was done. The 0% extracted green seaweed (EGW) was considered as control diet. Thirty fish with mean individual initial weight of 0.43 g were reared in the 100-L tank at salinity of 10 ppt, and fed ad libitum twice a day. After 45 days, the survival rates of fish were not significantly different among feeding treatments, varying from 91.1 to 94.4%. FM protein replaced from 15% to 45% treatments showed better or similar growth rates to that of the control diet. Although feed conversion ratio (FCR) increased, and protein efficiency ratio decreased with increasing levels of FM substitution from 30% upwards, statistical differences were not found among feeding treatments. The proximate composition of fish fillet such as the moisture, lipid, and ash contents tended to decrease with increasing level of EGW protein while the protein contents slightly increased at higher inclusion of EGW protein in the diet from 15% to 45%. The present study indicated that protein extracted green seaweed (Cladophoraceae) could replace fishmeal protein up to level of 45% in formulated feed for the mud skipper (P. elongatus) diets.

Keywords

Extracted protein Cladophoraceae, feed efficiency, growth, Pseudapocyptes elongatus

Cited as: Anh, N.T.N. and Hai, T.N., 2018. Effects of partial replacement of fishmeal protein by protein extracted from green seaweed (Cladophoraceae) in mudskipper (Pseudapocryptes elongatus) diets. Can Tho University Journal of Science. 54(5): 65-71.