The ro mutant was isolated by Hideo Tomita. Masahiko Hibi et al. found that ro locus encodes Contactin1b (Cntn1b). All the cntn1b mutant juvenile and adult fish show abnormal wobbling and rolling swimming behaviors. They have defective optokinetic response (OKR) adaptation and abnormal rheotaxis (body positioning to water flow).
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Takeuchi M, Inoue C, Goshima A, Nagao Y, Shimizu K, Miyamoto H, Shimizu T, Hashimoto H, Yonemura S, Kawahara A, Hirata Y, Yoshida M, Hibi M. Medaka and zebrafish contactin1 mutants as a model for understanding neural circuits for motor coordination. Genes Cells 2017/08.22(8).723-741.