A new liquid-type diet for leptocephali in mass production of artificial glass eels

  • Yoshiaki YamadaEmail author
  • Akihiro Okamura
  • Naomi Mikawa
  • Noriyuki Horie
  • Katsumi Tsukamoto
Original Article Aquaculture


Development of artificial production of glass eels still presents many problems to be solved. What and how to feed larvae is one of the most crucial problems for commercial mass production of glass eels. We evaluated a new liquid-type diet and feeding method against the conventional slurry-type diet by comparing the growth and survival of larvae in triplicate for 27 days after hatching. Larvae were fed by immersion in a liquid-type diet that was a 1.5 times dilution of the conventional slurry-type diet based on dogfish yolk spread over the bottom of the rearing tank. Larvae took more and denser liquid-type food in the intestine than the conventional slurry-type diet. Survival rates at 3 weeks after first feeding were about 90% in most experimental groups (5 groups) except one of three slurry-type diet groups (about 70%). Growth rates were 1.35 times higher in liquid-type diet groups (0.27 mm/day at 27 dph) than in conventional slurry-type diet groups (0.20 mm/day). These results suggest that the immersion feeding method in conjunction with the liquid-type diet has the potential to enable large scale production of glass eels by ensuring high growth and survival.


Anguilla japonica Rearing method Diet viscosity Aquaculture Larval food Leptocephalus 



MJ Miller helped to improve the manuscript. This study was partially supported by the research fund from Toyo Suisan Kaisha, Ltd. and JSPS KAKENHI Grant Number JP26450268, 26252030, 17K19300 to KT.

Supplementary material

12562_2019_1295_MOESM1_ESM.mpg (6.3 mb)
MOESM1_ESM.mpg (mpg 6429 KB)


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Copyright information

© Japanese Society of Fisheries Science 2019

Authors and Affiliations

  1. 1.IRAGO Institute Co. Ltd.TaharaJapan
  2. 2.Department of Aquatic Bioscience, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan

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