Even if you don't like research on koi, you will love this short, but very heartwarming research proving what every koi hobbyist has always known; we do build relationships with our beloved koi. Now proven through a scientific structured study, koi have personalities and indeed seek out voluntary relationships with their keepers. Though scientists have focused for centuries on the relationships between humans and mammals (especially captive mammals) this is likely the first fully scientific study in our hobby on relationship building between humans and koi.  Enjoy. 
 
"By demonstrating that koi will voluntarily interact with humans and that individual differences play an important role in interaction style, this study provides the first evidence that individuated human–fish relationships may be possible, which has powerful implications for how we think about, treat, protect, and provide care for fish."