Pattranuch Panalikul, Sutee Wongmaneeprateep
and Sompong Doolgindachbaporn*
Department of Fisheries, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
Two experiments were conducted at Khon Kaen University, Nong Khai campus, Thailand during May to December 2015 to justify effects of chitosan of Experiment 1 on growth performance of rice-field crabs. The Experiment 1 had five chitosan treatments, i.e. 0, 1, 2, 3 and 4 % (on dry matter basis). Experiment 2 had two treatments, i.e. the best treatment of Experiment 1 (T3) was chosen in comparison with flesh fish meat treatment. A Completely Randomized Design (CRD) with four replications was used for Experiments 1 and 2. The results of the Experiment 1 showed that a chitosan level of 2 % of T3 gave significantly (p < 0.05) better growth performance on final weight gained, weight gained, average daily growth rate, specific growth rate and survival rate (%) of the rice-field crabs than the rest, except that of the feed conversion ratio where T1 (control) was the highest. Thus a chitosan level of 2 % (T3) in the feed diet is recommended for rice-field crab culture. With the Experiment 2, the feed diet of T3 of Experiment 1, i.e. with 2 % chitosan gave significantly (p < 0.05) higher survival rate (%) of rice-field crabs than the flesh fish meat of T1.
Keywords: Chitosan, Esanthelphusa dugasti, Rice-field crab, growth performance.