Koharu's birthday is coming up and the girls try to figure out what to get her. Meanwhile, the girls learn how to tie some flies.
Thinking about their environment
and going through trial and error
التفكير في بيئتها والمرور بالتجربة والخطأ
auch interessant ist, auf Basis eigener
Beobachtungen der Naturverhältnisse
Es divertido observar el entorno
completo donde viven e ir probando
osserva l'ambiente dove vivono i pesci 
e sperimenta nuove tecniche.
Pensando no ambiente como um todo
e usando o método de tentativa e erro...