Como identificar Piauçu

Para identificar Piauçu (Lepidarchus adonis), observe estas características principais.

Características físicas

Formato do corpo

elongated

Coloração

Generally translucent to pale yellowish-brown, often with a faint, iridescent lateral stripe. Fins are typically hyaline (clear). Some individuals may exhibit a reddish or orange tint, particularly males during breeding.

Tipo de escama

cycloid

Posição da boca

terminal

Características distintivas

Extremely small adult size (typically less than 2 cm TL), Absence of an adipose fin (a key distinguishing feature among characins), Delicate, almost ghost-like appearance, Sexual dimorphism: males are often more slender and may display more intense coloration during courtship.

Nadadeira dorsal

Small, typically with 2 unbranched and 7-8 branched rays, positioned relatively far back on the body.

Nadadeira caudal

Forked, with symmetrical lobes.

Nadadeira peitoral

Small and transparent.

Nadadeiras características

Pelvic fins are very small or absent in some individuals, and the adipose fin is entirely absent, which is unusual for characins.

Dicas de identificação

1. 1

   Size

   Its exceptionally small adult size (rarely exceeding 2 cm total length) is the primary identifier. If it's larger than 2.5 cm, it's likely not Lepidarchus adonis.

2. 2

   Adipose Fin

   The complete absence of an adipose fin is a crucial diagnostic character that differentiates it from most other characins.

3. 3

   Body Coloration and Transparency

   Its translucent body and subtle coloration, often with a faint lateral line, are characteristic. It lacks prominent patterns or bold colors seen in many other small tetras.

4. 4

   Fin Structure

   The small, hyaline fins and the relatively posterior placement of the dorsal fin are also helpful identification points.

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