Results for “cycloid scale”
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Channa bleheriRainbow snakehead
Vierke, 1991
Max length170mm SL7in SLTank120 × 30cm48 × 12inTemp14–28°C57–82°FpH6.0–8.0C. bleheri is a popular aquarium fish though it remains unclear whether collection for the ornamentaol trade is having a detrimental effect on wild populations (see 'Habitat'). It's one of several genus members to lack pelvic fins and can be further distinguished from other Channa species by the following combination of characters: sides of lower jaw with one large cycloid scale; lateral line complete with 46-50 scales; 14 pectoral-fin rays; 25 anal-fin rays; 4-11 irregular reddish orange markings on the caudal-fin

Laetacara thayeri
Steindachner, 1875
Max length65mm SL2.6in SLTanknot recordedTemp20–28°C68–82°FpH4.5–7.5This species is relatively rare in the aquarium trade. It can be differentiated from all congeners by a combination of possessing ctenoid (vs. cycloid) scales on the sides of the head plus lacking a dark spot at the caudal-fin base.