Micro-encapsulated aquaculture feed

Abstract

To provide a feed that does not pollute rearing water, improves the immunity activity of leptocephalus larvae, is capable of directly feeding eel leptocephalus, and is capable of effectively inducing the growth of said larvae into glass eels. This micro-encapsulated aquaculture feed includes: an oil phase 11 having an oil-soluble nutrient component; a water phase 13 which is present inside the oil phase 11, and which includes a water-soluble nutrient component; and a film 15 which includes the oil phase 11 and the water phase 13. The water-soluble nutrient component includes at least one hydrolysate from among hydrolysates of amino acids, oligopeptides, and proteins.

1 . Microencapsulated feed for aquaculture, comprising:
 an oil phase ( 11 ) having an oil-soluble nutrient component;   an aqueous phase ( 13 ) that is present in the oil phase ( 11 ) and contains a water-soluble nutrient component; and   a coating ( 15 ) containing the oil phase ( 11 ) and the aqueous phase ( 13 ), wherein   the water-soluble nutrient component contains any one or more of amino acids, oligopeptides, and protein hydrolysates.   
     
     
         2 . The feed for aquaculture according to  claim 1 , wherein the water-soluble nutrient component further comprises saccharides selected from any one or more of monosaccharides, oligosaccharides, and polysaccharides. 
     
     
         3 . The feed for aquaculture according to  claim 1 , which is feed for  leptocephalus larvae  of eels, that is used for growing  leptocephalus larvae  of eels up to glass eels. 
     
     
         4 . The feed for aquaculture according to  claim 1 , wherein
 the water-soluble nutrient component comprises a protein hydrolysate, and   the protein hydrolysate is obtained by hydrolyzing a protein source containing either or both of a vegetable protein and an animal protein, using a proteolytic enzyme, a hydrochloric acid, or hot water.   
     
     
         5 . The feed for aquaculture according to  claim 1 , wherein
 the water-soluble nutrient component comprises a protein hydrolysate, and the protein hydrolysate contains any one or more of soybean enzyme-treated proteins, fish and shellfish autolyzed extracts, fishmeal enzyme-treated decomposition extracts and fish meat hot water-treated decomposition extracts.   
     
     
         6 . The feed for aquaculture according to  claim 1 , wherein the coating ( 15 ) is a biodegradable polymer film. 
     
     
         7 . The feed for aquaculture according to  claim 1 , further comprising an immunostimulator. 
     
     
         8 . The feed for aquaculture according to  claim 7 , wherein the immunostimulator comprises any one or more of lactic acid bacteria, yeasts,  aspergillus oryzae,  hay  bacillus, Bacillus subtilis  var natto, intestinal bacteria derived from adult fish intestines of fish of the order Anguilliformes, intestinal bacteria derived from glass eel intestines of fish of the order Anguilliformes, and intestinal bacteria derived from  leptocephalus larva  intestines of fish of the order Anguilliformes.