Figure 10

Mean standard length at age for R. oxycephalus and closely related species. (a) R. oxycephalus in Laohegou Stream (32° 30′ N, 104° 38′ E), (b) R. lagowski in Suifen River (43° 20′ to 44° 40′ N, 130° 20′ to 132° 30′ E), (c) R. percnurus in Suifen River (43° 20′ to 44° 40′ N, 130° 20′ to 132° 30′ E), (d) C. tennesseensis in Tennessee stream (36° 34′ N, 82° 26′ W), (e) P. phoxinus in Frome River (50° 19′ N, 2° 20′ W), (f) P. phoxinus in Utsjoki River (69° 38′ N, 27° 04′ E).