Body shape affects movement in stream fishes (Chuang et al. 2006) and may be a useful tool for predicting
habitat preferences (Stolbunov et al. 2011). For O. krongnoensis, the slender, streamlined body with a large number
of predorsal scales (15−17) and long caudal peduncle may provide greater swimming ability and allow it to inhabit
rapid rivers and streams at high elevations such as those in the Ea Krong No drainage. In contrast, O. dongnaiensis
and O. leptura have a deeper body, fewer predorsal scales (12−15) and a short caudal peduncle, which may be more
suitable features for slow, low elevation streams such as the middle of the Dong Nai and Red river drainages
(Hoang et al. pers.obs.). Further studies on the capabilities and physiological mechanisms of O. krongnoensis that
allow the species to live in such rapid streams would be interesting.
Pronounced sexual dimorphism in the anal-fin size has been observed for several species of Onychostoma
(Hoang et al. pers. obs.), but has not been reported. This morphological character highlights the importance of
making intraspecific comparisons separately for each sex. The functional role of the sexual dimorphism in O.
krongnoensis and O. dongnaiensis is unknown.
Body shape affects movement in stream fishes (Chuang et al. 2006) and may be a useful tool for predictinghabitat preferences (Stolbunov et al. 2011). For O. krongnoensis, the slender, streamlined body with a large numberof predorsal scales (15−17) and long caudal peduncle may provide greater swimming ability and allow it to inhabitrapid rivers and streams at high elevations such as those in the Ea Krong No drainage. In contrast, O. dongnaiensisand O. leptura have a deeper body, fewer predorsal scales (12−15) and a short caudal peduncle, which may be moresuitable features for slow, low elevation streams such as the middle of the Dong Nai and Red river drainages(Hoang et al. pers.obs.). Further studies on the capabilities and physiological mechanisms of O. krongnoensis thatallow the species to live in such rapid streams would be interesting.Pronounced sexual dimorphism in the anal-fin size has been observed for several species of Onychostoma(Hoang et al. pers. obs.), but has not been reported. This morphological character highlights the importance ofmaking intraspecific comparisons separately for each sex. The functional role of the sexual dimorphism in O.krongnoensis and O. dongnaiensis is unknown.
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