必威体育精装版大型海藻孔石莼饲料化利用的初步研究.pdfVIP

Abstract Abstract Algae belong to low-grade oceanic plant, which are rich in carbohydrate, protein, lipid, miner and vitamin. China has a vast sea area, and the resource of seaweed is about 100 million tons. However, this abundant algal resource has not yet been effectively used. Rabbitfish Siganus canaliculatus is a poplular fish which is raised in the coast southeast China recent years. The culture cycle of rabbitfish is short, and it has less disease. Morever, it contains high content of HUAF, such as EPA,DHA,ARA ect. In natural environmen, rabbitfish could eat lots of macroalgae, and it is the only intensive cultured herbivorous marine fish species in China now. Moreover, Our previous studies showed that Ulva was the preferred macroalgae for rabbitfish. and it can be digested comparetive easily by rabbitfish. In order to develop a compound feed with low price and high effective, and exploit a new utilization for abundant low value macoraglae, we designed two trials--a digestivity trial and a growth trial, aiming to use alga Ulva as dietary ingredient and determine its appropriate addition ratio. The results were as follows: 1. Study on the feasibility of using Ulva as dietary carbohydrate source for rabbitfish Based on the following feed formulation: fish meal as a protein source, fish oil as lipid source, a-starch as a basic carbohydrate source, and the powders of Ulva and Gracilaria, as well as wheat starch, corn starch and wheat bran as additional carbohydrate sources. Rabittfish juveniles were fed for two weeks with compound diets added with one of the above five kinds of carbohydrate at 30% level, aimed at co