トビゴイに関する研究-I : トビの現れる時期に就いて

概要

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Some individuals among carps of one batch grow much faster than other in the same condition. We call them “Tobi-Koi” or Shoot-carps. They show characteristic asymmetry on the frequency curve of the body length of the batch. We calculated the skewness Sk=1/σ3•1/N•∑fi(xi--x)3 and found that its value is larger than +1.5 in many cases in which the Tobi-Koi appears. The frequency curves of the egg diameter, body length of hatched larvae and 8 days old post-larvae kept without feeding show approximately the normal distribution, but after 20 days culture fed with Cladocerans the Tobi-Koi individuals are found already.
公益社団法人日本水産学会の論文